Requirements by state

Texas water operator certification

Reviewed 2026-07-29

Quick answer

How do I get certified as a water operator in Texas?

Texas licenses water system operators (Class D through A, plus a non-renewable Provisional D) and separately licenses wastewater treatment plant operators (Class D through A) and wastewater collection system operators (Class I through III). Every application, including reciprocity, costs $111 ($74 for Provisional D) through the OLEA online system. Renewal runs every 3 years and requires 30 hours of continuing education. Reciprocity has no formal agreement list: TCEQ verifies the applicant's out-of-state license and may waive exam or training requirements case by case.

Last reviewed 2026-07-29

See how Texas compares to every other jurisdiction in the national comparison matrix, or check reciprocity between states if you are moving.

Certifying agency: Texas Commission on Environmental Quality (TCEQ), Occupational Licensing Section

Hold a high school diploma or GED for a standard Class D license; a Provisional Class D is available with no education or experience prerequisite but expires after 2 years and must be upgraded.
Complete the required training-hour package for the class and specialization sought (as few as 1 course at Class D, up to 184 hours for water Class A), all through TCEQ-approved providers.
Pass a computer-based licensing exam with a minimum 70% score at an approved testing center.
Complete resiliency training addressing weather emergencies and power outages, required of all operators as of April 1, 2024.

Water treatment

D: Class D , HS diploma/GED, no experience required. Only course: Basic Water Operations plus the Resiliency Overview. Most Class D licenses are non-renewable.
C: Class C , HS diploma/GED, 2 years experience (1 year hands-on). Entry-level specialized operator, fewer training hours than Class B.
B: Class B , Bachelor's degree plus 2.5 years hands-on experience, or HS diploma/GED plus 5 years (3 hands-on). Specialized in surface water, groundwater, or distribution.
A: Class A , Master's degree plus 4 years experience, bachelor's plus 5 years, or HS diploma/GED plus 8 years (6 hands-on). 184 training hours required.
PD: Provisional Class D , No education or experience prerequisite. Valid 2 years, then must upgrade to standard Class D or higher.

Exam: Computer-based licensing exam at an approved testing center, minimum 70% to pass, submitted and scheduled through TCEQ's Occupational Licensing Electronic Application (OLEA) system.
Education minimum: Class D and Class C: high school diploma or GED. Class B: bachelor's degree or HS diploma/GED. Class A: master's degree, bachelor's degree, or HS diploma/GED, with the required experience scaling inversely with education level. Provisional Class D requires no education.
Experience minimum: Class D: none. Class C: 2 years (1 hands-on). Class B: 2.5 years hands-on with a bachelor's, or 5 years (3 hands-on) with only a HS diploma/GED. Class A: 4 years with a master's, 5 years with a bachelor's, or 8 years (6 hands-on) with only a HS diploma/GED.
Application / certification fee: $111 for a standard license application (any class); $74 for a Provisional Class D application, submitted through OLEA.
Continuing education: 30 continuing-education hours per 3-year renewal cycle, including 2 hours of resiliency training, from TCEQ-approved courses.
Renewal cycle: 3 years
Reciprocity: TCEQ has no published state-by-state reciprocity agreement list. An out-of-state applicant with a current license in good standing, who has already passed an exam to earn it, applies through OLEA with the standard $111 fee; TCEQ contacts the issuing state to verify the license and determines the corresponding Texas class. With the exception of landscape irrigators, TCEQ may waive qualifications, training, or the exam on a case-by-case basis.

Texas issues one 'Water System Operator' license type covering surface water treatment, groundwater treatment, and distribution as specializations within the same Class D-to-A framework, rather than fully separate treatment and distribution license categories.

Water distribution

D: Class D , Entry level, part of the same Water System Operator license ladder as treatment.
C: Class C , 2 years experience (1 hands-on).
B: Class B , Distribution specialization available at Class B, same education/experience structure as treatment.
A: Class A , Highest distribution license, same structure as treatment Class A.

Exam: Same OLEA-scheduled, computer-based licensing exam as water treatment, a distribution-specific exam.
Application / certification fee: $111 standard application ($74 Provisional D).
Continuing education: 30 hours per 3-year cycle, including 2 hours resiliency training, same as water treatment.
Renewal cycle: 3 years
Reciprocity: Same case-by-case reciprocity review and $111 fee as water treatment.

Distribution is a specialization within the same Water System Operator license, not a separate license type, unlike wastewater where treatment and collection are fully separate licenses.

Wastewater treatment

D: Class D , HS diploma/GED only, no experience required. Only course: Basic Wastewater Operation.
C: Class C , HS diploma/GED, 2 years experience (1 hands-on). Core courses: basic wastewater operation, activated sludge, plus one elective.
B: Class B , Bachelor's degree plus 2.5 years hands-on, or HS diploma/GED plus 5 years (3 hands-on). Core courses in basic operations, activated sludge, collection, laboratory, safety, plus one elective.
A: Class A , Master's degree plus 4 years, bachelor's plus 5 years, or HS diploma/GED plus 8 years (6 hands-on). 160+ training hours covering basic operations, activated sludge, collection, laboratory, and safety.
PD: Provisional Class D , No education/experience prerequisite, valid 2 years, same training as standard Class D.

Exam: Same OLEA-scheduled, computer-based licensing exam, a wastewater treatment-specific exam. Class A exams may run up to 6 hours; confirm timing with the testing center beforehand.
Education minimum: Same structure as water treatment: Class D and C need a HS diploma/GED, Class B a bachelor's degree or HS diploma/GED, Class A a master's, bachelor's, or HS diploma/GED with experience scaling inversely.
Experience minimum: Class D: none. Class C: 2 years (1 hands-on). Class B: 2.5 years hands-on with a bachelor's, or 5 years (3 hands-on) with a HS diploma/GED. Class A: 4 years with a master's, 5 years with a bachelor's, or 8 years (6 hands-on) with a HS diploma/GED.
Application / certification fee: $111 standard application ($74 Provisional D).
Continuing education: 30 hours per 3-year cycle. Classes A and B cannot use Basic Wastewater Operation for renewal credit; Class D operators cannot renew if they supervise an activated sludge facility, a large trickling filter/RBC system, or subsurface drip dispersal.
Renewal cycle: 3 years
Reciprocity: Same case-by-case reciprocity review and $111 fee as water treatment.

Wastewater treatment is a fully separate license from water treatment in Texas, each with its own OLEA application, though the fee and 3-year renewal structure match.

Wastewater collection

I: Class I , HS diploma/GED, no experience required. Training: Wastewater Collection only.
II: Class II , HS diploma/GED, 2 years experience (1 hands-on). Core: basic operations and collection plus one elective (safety or pump/motor maintenance).
III: Class III , Bachelor's degree plus 2.5 years hands-on, or HS diploma/GED plus 5 years (3 hands-on). Comprehensive training covering operations, collection, safety, pump maintenance, plus electives.

Exam: Same OLEA-scheduled, computer-based licensing exam, a collection-specific exam per class.
Experience minimum: Class I: none. Class II: 2 years (1 hands-on). Class III: 2.5 years hands-on with a bachelor's, or 5 years (3 hands-on) with a HS diploma/GED.
Application / certification fee: $111 standard application.
Continuing education: 30 hours per 3-year cycle, same structure as the other Texas licenses.
Renewal cycle: 3 years
Reciprocity: Same case-by-case reciprocity review and $111 fee as the other Texas licenses.

Texas wastewater collection tops out at Class III, one tier short of the four-class ladder used for water and wastewater treatment; there is no Class IV collection license.

Texas licenses operators through TCEQ’s Occupational Licensing Electronic Application (OLEA) system, and the state keeps water and wastewater on genuinely different license structures: one combined Water System Operator license (treatment and distribution as specializations) for drinking water, and two fully separate licenses, treatment and collection, on the wastewater side.

Class D to A, with education trading directly against experience

Every discipline uses the same trade-off between education and experience at each class. At the top, Class A, the same experience count applies across water and wastewater treatment: 4 years with a master’s degree, 5 years with a bachelor’s, or 8 years (6 hands-on) with only a high school diploma or GED.

Class	Water/wastewater treatment education path	Training hours
D	HS diploma/GED, no experience	Basic Operations course only
C	HS diploma/GED, 2 years (1 hands-on)	Basic + activated sludge/specialization
B	Bachelor’s + 2.5 yrs, or HS diploma/GED + 5 yrs (3 hands-on)	Multiple core courses + elective
A	Master’s + 4 yrs, bachelor’s + 5 yrs, or HS diploma/GED + 8 yrs (6 hands-on)	160 to 184 hours

A Provisional Class D license, available for applicants without a high school diploma or GED, needs no education or experience but expires after 2 years and must be upgraded to a standard license. Wastewater collection runs a shorter three-class ladder (I, II, III) instead of the four-class treatment structure, and there is no Class IV collection license in Texas.

One combined water license, two separate wastewater licenses

Texas issues a single Water System Operator license where surface water treatment, groundwater treatment, and distribution are specializations within the same Class D-to-A framework, rather than fully separate license types. Wastewater works differently: wastewater treatment and wastewater collection are two entirely separate licenses, each with its own OLEA application, though both share the same $111 fee and 3-year renewal cycle.

Fees, exam, and renewal

Every application, standard or reciprocity, costs $111 ($74 for Provisional D), submitted through OLEA. The exam is computer-based at an approved testing center, minimum 70% to pass; a Class A exam can run up to 6 hours, so confirm timing with the center in advance. Renewal comes every 3 years and requires 30 hours of continuing education, including 2 hours of resiliency training addressing weather emergencies and power outages, mandatory for every operator since April 1, 2024. Classes A and B cannot use the entry-level Basic Wastewater Operation course for renewal credit, and a Class D wastewater operator cannot renew if supervising an activated sludge facility, a large trickling filter/RBC system, or subsurface drip dispersal.

Moving to or from Texas

TCEQ does not publish a state-by-state reciprocity agreement list. Instead, an applicant with a current out-of-state license in good standing, who already passed an exam to earn it, applies through OLEA with the standard $111 fee; TCEQ contacts the issuing state to verify the license and determines the equivalent Texas class. With the exception of landscape irrigators, TCEQ may waive qualifications, training, or the exam itself on a case-by-case basis. See reciprocity between states for how this compares generally.

Where to go from here

Use the operator-math trainer to practice the pounds formula, CT disinfection, and loading-rate math Texas’s licensing exams draw on, and the process calculator for the same formulas on the job. Not sure which discipline to start in? Water treatment vs wastewater operator walks through the day-to-day difference. See your state’s page once more states are verified.

Sources: Texas Commission on Environmental Quality, Occupational Licensing program pages for water system operators, wastewater treatment/collection operators, and reciprocity (tceq.texas.gov/licensing, retrieved 2026-07-29). Authored by the Water Cert Prep editorial team. Not legal advice. Reviewed 2026-07-29.