OpenExamsFREE PRACTICE — ANY EXAM

Colorado Water Well Driller — Requirements & Free Practice

US-CO · License preparation

1000 free questions · Answer explanations · No signup required

Choose what to practice

Start with an exam below. Your examination requirements depend on your application pathway. View licensing requirements

Combined practice

Choose an exam or combined practice to begin.

Licenses, application pathways and examination requirements

Each license and applicant pathway has its own requirements and exemptions. Choosing practice questions does not determine your eligibility.

Water Well Construction Contractor License — Air Rotary Construction

The Board-designated air rotary construction license type. A contractor may obtain authorization for more than one designated method on the licensing application.

Licensing authority: Colorado State Board of Examiners of Water Well and Ground Heat Exchanger Contractors · Application information

Additional construction method for an existing ordinary licensee

All of the following:

  • Exam C/D: Air Rotary Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold an ordinary Colorado well construction contractor license; apply to add a different designated construction method.
Experience
An applicant already licensed in an ordinary designated well construction method is eligible without further experience to examine for another designated method under C.R.S. § 37-91-105(2)(d)(I) and Rule 6.4.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Air Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA air rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Initial licensure by examination

All of the following:

  • Exam C/D: Air Rotary Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Air Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA air rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Reinstatement after lapse for continuing education
No examination is required for this applicant pathway.
Board Notification
The Board must determine that the requirements are fulfilled and notify the contractor in writing that the license is reinstated.
Continuing Education
Complete the required continuing education, submit the Certificate of Completion, and pay the reinstatement fee.
Lapse Reason
The license lapsed for failure to complete continuing education or file the Certificate of Completion.
Licensed Method
Air Rotary Construction
No Carryover
Continuing education completed for reinstatement cannot be applied to the next license renewal period.

Official no-examination sources

Effective from 2026-09-22.

Reinstatement after lapse for financial responsibility
No examination is required for this applicant pathway.
Financial Responsibility
Submit current evidence of the required financial responsibility.
Lapse Reason
The license lapsed for failure to maintain financial responsibility.
Licensed Method
Air Rotary Construction
Reinstatement Fee
Pay the $100 statutory reinstatement fee.

Official no-examination sources

Effective from 2026-09-22.

Renewal within one year after lapse
No examination is required for this applicant pathway.
Fees
Pay all fees in arrears.
Lapse Period
The license lapsed no more than one year ago.
Licensed Method
Air Rotary Construction
Renewal Compliance
Meet the applicable renewal, continuing-education and financial-responsibility requirements; C.R.S. § 37-91-107(4)(a)(II) expressly permits renewal without reexamination within one year.

Official no-examination sources

Effective from 2026-09-22.

License renewal
No examination is required for this applicant pathway.
Continuing Education
Complete eight hours of approved continuing education each calendar year and file the Certificate of Completion by January 15. BOE Policy 2025-2 permits no more than four of the eight hours to be earned by internet or online participation in 2026.
Employee List
Provide the employee proficiency list and continuing education/training information required by Rule 6.1.3.
Existing License
Hold this license and renew annually or elect a two- or three-year interval.
Financial Responsibility
Maintain required financial responsibility throughout the renewal term.
Licensed Method
Air Rotary Construction
Renewal Fee
Pay all renewal fees for the chosen license term.

Official no-examination sources

Effective from 2026-09-22.

Ordinary licensure for a special license holder

All of the following:

  • Exam C/D: Air Rotary Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold a special license and seek an ordinary construction-method license; the special license does not waive the statutory requirements or the two years of experience in the additional method under Rule 6.5.3.
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Air Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA air rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.

Water Well Construction Contractor License — Cable Tool Construction

The Board-designated cable tool construction license type. A contractor may obtain authorization for more than one designated method on the licensing application.

Licensing authority: Colorado State Board of Examiners of Water Well and Ground Heat Exchanger Contractors · Application information

Additional construction method for an existing ordinary licensee

All of the following:

  • Exam A/B: Cable Tool Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold an ordinary Colorado well construction contractor license; apply to add a different designated construction method.
Experience
An applicant already licensed in an ordinary designated well construction method is eligible without further experience to examine for another designated method under C.R.S. § 37-91-105(2)(d)(I) and Rule 6.4.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Cable Tool Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA cable tool construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Initial licensure by examination

All of the following:

  • Exam A/B: Cable Tool Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Cable Tool Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA cable tool construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Reinstatement after lapse for continuing education
No examination is required for this applicant pathway.
Board Notification
The Board must determine that the requirements are fulfilled and notify the contractor in writing that the license is reinstated.
Continuing Education
Complete the required continuing education, submit the Certificate of Completion, and pay the reinstatement fee.
Lapse Reason
The license lapsed for failure to complete continuing education or file the Certificate of Completion.
Licensed Method
Cable Tool Construction
No Carryover
Continuing education completed for reinstatement cannot be applied to the next license renewal period.

Official no-examination sources

Effective from 2026-09-22.

Reinstatement after lapse for financial responsibility
No examination is required for this applicant pathway.
Financial Responsibility
Submit current evidence of the required financial responsibility.
Lapse Reason
The license lapsed for failure to maintain financial responsibility.
Licensed Method
Cable Tool Construction
Reinstatement Fee
Pay the $100 statutory reinstatement fee.

Official no-examination sources

Effective from 2026-09-22.

Renewal within one year after lapse
No examination is required for this applicant pathway.
Fees
Pay all fees in arrears.
Lapse Period
The license lapsed no more than one year ago.
Licensed Method
Cable Tool Construction
Renewal Compliance
Meet the applicable renewal, continuing-education and financial-responsibility requirements; C.R.S. § 37-91-107(4)(a)(II) expressly permits renewal without reexamination within one year.

Official no-examination sources

Effective from 2026-09-22.

License renewal
No examination is required for this applicant pathway.
Continuing Education
Complete eight hours of approved continuing education each calendar year and file the Certificate of Completion by January 15. BOE Policy 2025-2 permits no more than four of the eight hours to be earned by internet or online participation in 2026.
Employee List
Provide the employee proficiency list and continuing education/training information required by Rule 6.1.3.
Existing License
Hold this license and renew annually or elect a two- or three-year interval.
Financial Responsibility
Maintain required financial responsibility throughout the renewal term.
Licensed Method
Cable Tool Construction
Renewal Fee
Pay all renewal fees for the chosen license term.

Official no-examination sources

Effective from 2026-09-22.

Ordinary licensure for a special license holder

All of the following:

  • Exam A/B: Cable Tool Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold a special license and seek an ordinary construction-method license; the special license does not waive the statutory requirements or the two years of experience in the additional method under Rule 6.5.3.
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Cable Tool Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA cable tool construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.

Water Well Construction Contractor License — Mud Rotary Construction

The Board-designated mud rotary construction license type. A contractor may obtain authorization for more than one designated method on the licensing application.

Licensing authority: Colorado State Board of Examiners of Water Well and Ground Heat Exchanger Contractors · Application information

Additional construction method for an existing ordinary licensee

All of the following:

  • Exam E/F: Mud Rotary Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold an ordinary Colorado well construction contractor license; apply to add a different designated construction method.
Experience
An applicant already licensed in an ordinary designated well construction method is eligible without further experience to examine for another designated method under C.R.S. § 37-91-105(2)(d)(I) and Rule 6.4.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Mud Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA mud rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Initial licensure by examination

All of the following:

  • Exam E/F: Mud Rotary Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Mud Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA mud rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Reinstatement after lapse for continuing education
No examination is required for this applicant pathway.
Board Notification
The Board must determine that the requirements are fulfilled and notify the contractor in writing that the license is reinstated.
Continuing Education
Complete the required continuing education, submit the Certificate of Completion, and pay the reinstatement fee.
Lapse Reason
The license lapsed for failure to complete continuing education or file the Certificate of Completion.
Licensed Method
Mud Rotary Construction
No Carryover
Continuing education completed for reinstatement cannot be applied to the next license renewal period.

Official no-examination sources

Effective from 2026-09-22.

Reinstatement after lapse for financial responsibility
No examination is required for this applicant pathway.
Financial Responsibility
Submit current evidence of the required financial responsibility.
Lapse Reason
The license lapsed for failure to maintain financial responsibility.
Licensed Method
Mud Rotary Construction
Reinstatement Fee
Pay the $100 statutory reinstatement fee.

Official no-examination sources

Effective from 2026-09-22.

Renewal within one year after lapse
No examination is required for this applicant pathway.
Fees
Pay all fees in arrears.
Lapse Period
The license lapsed no more than one year ago.
Licensed Method
Mud Rotary Construction
Renewal Compliance
Meet the applicable renewal, continuing-education and financial-responsibility requirements; C.R.S. § 37-91-107(4)(a)(II) expressly permits renewal without reexamination within one year.

Official no-examination sources

Effective from 2026-09-22.

License renewal
No examination is required for this applicant pathway.
Continuing Education
Complete eight hours of approved continuing education each calendar year and file the Certificate of Completion by January 15. BOE Policy 2025-2 permits no more than four of the eight hours to be earned by internet or online participation in 2026.
Employee List
Provide the employee proficiency list and continuing education/training information required by Rule 6.1.3.
Existing License
Hold this license and renew annually or elect a two- or three-year interval.
Financial Responsibility
Maintain required financial responsibility throughout the renewal term.
Licensed Method
Mud Rotary Construction
Renewal Fee
Pay all renewal fees for the chosen license term.

Official no-examination sources

Effective from 2026-09-22.

Ordinary licensure for a special license holder

All of the following:

  • Exam E/F: Mud Rotary Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold a special license and seek an ordinary construction-method license; the special license does not waive the statutory requirements or the two years of experience in the additional method under Rule 6.5.3.
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Mud Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA mud rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.

Water Well Construction Contractor License — Reverse Rotary Construction

The Board-designated reverse rotary construction license type. A contractor may obtain authorization for more than one designated method on the licensing application.

Licensing authority: Colorado State Board of Examiners of Water Well and Ground Heat Exchanger Contractors · Application information

Additional construction method for an existing ordinary licensee

All of the following:

  • Exam G: Reverse Circulation Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold an ordinary Colorado well construction contractor license; apply to add a different designated construction method.
Experience
An applicant already licensed in an ordinary designated well construction method is eligible without further experience to examine for another designated method under C.R.S. § 37-91-105(2)(d)(I) and Rule 6.4.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Reverse Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA reverse rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Initial licensure by examination

All of the following:

  • Exam G: Reverse Circulation Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Reverse Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA reverse rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.
Reinstatement after lapse for continuing education
No examination is required for this applicant pathway.
Board Notification
The Board must determine that the requirements are fulfilled and notify the contractor in writing that the license is reinstated.
Continuing Education
Complete the required continuing education, submit the Certificate of Completion, and pay the reinstatement fee.
Lapse Reason
The license lapsed for failure to complete continuing education or file the Certificate of Completion.
Licensed Method
Reverse Rotary Construction
No Carryover
Continuing education completed for reinstatement cannot be applied to the next license renewal period.

Official no-examination sources

Effective from 2026-09-22.

Reinstatement after lapse for financial responsibility
No examination is required for this applicant pathway.
Financial Responsibility
Submit current evidence of the required financial responsibility.
Lapse Reason
The license lapsed for failure to maintain financial responsibility.
Licensed Method
Reverse Rotary Construction
Reinstatement Fee
Pay the $100 statutory reinstatement fee.

Official no-examination sources

Effective from 2026-09-22.

Renewal within one year after lapse
No examination is required for this applicant pathway.
Fees
Pay all fees in arrears.
Lapse Period
The license lapsed no more than one year ago.
Licensed Method
Reverse Rotary Construction
Renewal Compliance
Meet the applicable renewal, continuing-education and financial-responsibility requirements; C.R.S. § 37-91-107(4)(a)(II) expressly permits renewal without reexamination within one year.

Official no-examination sources

Effective from 2026-09-22.

License renewal
No examination is required for this applicant pathway.
Continuing Education
Complete eight hours of approved continuing education each calendar year and file the Certificate of Completion by January 15. BOE Policy 2025-2 permits no more than four of the eight hours to be earned by internet or online participation in 2026.
Employee List
Provide the employee proficiency list and continuing education/training information required by Rule 6.1.3.
Existing License
Hold this license and renew annually or elect a two- or three-year interval.
Financial Responsibility
Maintain required financial responsibility throughout the renewal term.
Licensed Method
Reverse Rotary Construction
Renewal Fee
Pay all renewal fees for the chosen license term.

Official no-examination sources

Effective from 2026-09-22.

Ordinary licensure for a special license holder

All of the following:

  • Exam G: Reverse Circulation Drilling
  • Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation (practice unavailable)
  • Oral Examination (practice unavailable)
Citizenship
C.R.S. § 37-91-105(2)(b) requires United States citizenship or a declared intention to become a citizen.
Education Credit
The Board may credit approved education and training with GPA at least 2.0/4.0 toward no more than one year of the experience requirement (Rule 6.4.3).
Existing License
Hold a special license and seek an ordinary construction-method license; the special license does not waive the statutory requirements or the two years of experience in the additional method under Rule 6.5.3.
Experience
Demonstrate two years (24 months) of active, on-site, hands-on experience in the requested work; provide experience affidavits and employment verification. Applicable military experience may count.
Financial Responsibility
Submit license fees and maintain $20,000 evidence of financial responsibility by an approved bond or alternative funds under current Rule 7.2.1 before issuance.
License Exempt Work
C.R.S. § 37-91-106(2)-(4) exempts directly employed or supervised workers, private drillers, and specified scientific work from the contractor license requirements. A private driller must complete the separate online, open-book private driller assessment before well construction or repair under 2 CCR 402-2, Rule 6.1.1; this is not a contractor-license pathway.
Licensed Method
Reverse Rotary Construction
Minimum Age
At least 21 years old under C.R.S. § 37-91-105(2)(a).
Out Of State License
Form GWS-26 asks applicants licensed elsewhere to identify and attach that license. C.R.S. § 37-91-105 and Rule 6.6 prescribe the written and oral examinations for applicants; the application does not establish a separate endorsement or examination-waiver route.
Residency Fees
Resident applications cost $20 for the well construction contractor category; nonresident applications cost $50. Statutory issuance fees differ by residence; submit the fees and financial responsibility required before licensing.
Retake
A failed examination may be retaken after 45 days with the required reexamination fee.
Score Currency
Results of Board-conducted or Board-recognized examinations are valid for two years from examination; reapply if no license is obtained within two years of the initial application.
Sequence
Pass the written examinations before the oral examination; the written exams should be completed at least 40 days before the next regular Board meeting.
Technical Written Examinations
Pass the registered NGWA reverse rotary construction method examination used by the Board under Rule 6.2 and its incorporated statement of basis and purpose. The December 2024 licensing instructions also require NGWA technical examinations generally but do not identify a distinct additional general examination for this route. Any further Board-assigned, unnamed examination slots remain applicant conditions.

Oral Examination

Examination outline
  • Prime requirements identified in the Board licensing instructions
    • Knowledge of the Water Well Construction Rules
    • Accepted construction practices related to practical situations
    • Pump installation practices related to practical situations
    • Disinfection practices related to practical situations
Examination sources

Exam on the Colorado Rules and Regulations for Well Construction and Pump Installation

Practice scope

Inferred from the examination name; the authority has not published an examination outline.

  • Colorado Revised Statutes, Title 37, Article 91: Water Well and Ground Heat Exchanger Contractors
  • BOE Administration Rules, 2 CCR 402-14
  • Rules and Regulations for Water Well Construction, Pump Installation, Cistern Installation, and Monitoring and Observation Hole/Well Construction, 2 CCR 402-2
Examination sources

Exam C/D: Air Rotary Drilling

Provider
National Ground Water Association (NGWA); administered by PSI Services at PSI test centers
Format
Computer-based, closed-book examination taken at a PSI test center; pass/fail status on screen at completion, with a diagnostic score report by section for candidates who do not pass
Exam questions
50 questions
Time limit
1 hour
Passing score
70% (minimum passing score)
Exam fee
$75 per exam
Examination outline
  • Mobilize for the Site (6 of 50 items)
  • Construct Water Well (34 of 50 items)
  • Develop Wells (7 of 50 items)
  • Decommission Wells (2 of 50 items)
  • Demobilize the Site (1 of 50 items)
Examination sources

Exam A/B: Cable Tool Drilling

Provider
National Ground Water Association (NGWA); administered by PSI Services at PSI test centers
Format
Computer-based, closed-book examination taken at a PSI test center; pass/fail status on screen at completion, with a diagnostic score report by section for candidates who do not pass
Exam questions
50 questions
Time limit
1 hour
Passing score
70% (minimum passing score)
Exam fee
$75 per exam
Examination outline
  • Mobilize for the Site (3 of 50 items)
  • Construct Water Well (30 of 50 items)
  • Rehabilitate Wells (4 of 50 items)
  • Develop Wells (7 of 50 items)
  • Decommission Wells (3 of 50 items)
  • Demobilize the Site (3 of 50 items)
Examination sources

Exam E/F: Mud Rotary Drilling

Provider
National Ground Water Association (NGWA); administered by PSI Services at PSI test centers
Format
Computer-based, closed-book examination taken at a PSI test center; pass/fail status on screen at completion, with a diagnostic score report by section for candidates who do not pass
Exam questions
50 questions
Time limit
1 hour
Passing score
70% (minimum passing score)
Exam fee
$75 per exam
Examination outline
  • Mobilize for the Site (9 of 50 items)
  • Construct Water Well (18 of 50 items)
  • Prepare/Manage Drilling Fluids (17 of 50 items)
  • Develop Wells (5 of 50 items)
  • Demobilize the Site (1 of 50 items)
Examination sources

Exam G: Reverse Circulation Drilling

Provider
National Ground Water Association (NGWA); administered by PSI Services at PSI test centers
Format
Computer-based, closed-book examination taken at a PSI test center; pass/fail status on screen at completion, with a diagnostic score report by section for candidates who do not pass
Exam questions
50 questions
Time limit
1 hour
Passing score
70% (minimum passing score)
Exam fee
$75 per exam
Examination outline
  • Reverse Circulation Drilling (50 of 50 items)
Examination sources