Studying for a Texas water or wastewater operator exam? You're in the right place. Pick your discipline below: each tab has the certification levels, how Texas names them, and the practice tests that match.
Track your progress on the Texas exam prep
A free account keeps every score on your phone and computer, so you can watch your Texas exam prep scores climb attempt by attempt.
Welcome back. Your Texas test scores are saved to your account, view your history →
Choose your certification
How Texas classifies drinking-water operators
Texas licenses water and wastewater operators through TCEQ under 30 TAC Chapter 30, Subchapter K for water and Subchapter J for wastewater, alongside Chapter 290 for public drinking water.
Full breakdown in the FAQ below.
Choose your Texas certification track
TCEQ splits Texas water operator licenses into three specialty licenses at Class C and Class B: Surface Water (lakes, rivers, reservoirs and GWUDI sources), Groundwater (wells and aquifer-fed systems), and Distribution (shown in the Distribution tab). Class D is a single combined entry exam and Class A is a single master-level exam, so the split exists only in the middle of the ladder.
Before you settle on Class D: most Class D licenses are not renewable, and TCEQ will not issue a new one to someone already operating a surface water system, a GWUDI system, groundwater systems of 250+ connections or serving 750+ people, or supervising distribution systems over 250 connections. If that is your situation, plan straight for Class C.
Surface Water Track
For operators of plants treating lakes, rivers, reservoirs, or GWUDI sources. Tests cover conventional treatment, SWTR, DBPs, and source-water protection.
Groundwater Track
For operators of well-fed systems. Tests cover well operation, drawdown/specific capacity, Fe/Mn removal, well disinfection, and the Groundwater Rule.
Master level, both tracks combined
Practice by topic
Drill the specific subject areas on the Texas drinking-water exam.
Texas wastewater practice tests
TCEQ licenses wastewater in two ladders that are named differently, which catches people out. Treatment runs Class D at entry up to Class A at the top, matching the letters used on the drinking-water side. Collection runs Class I, II and III with III the highest, and is covered under Collections. So an operator holding Class A treatment and Class III collection holds the top of both ladders even though the codes look nothing alike. Class D is genuinely open: a high school diploma or GED plus the Basic Wastewater Operation course, no experience. Without a diploma or GED there is a Provisional Class D at $74, valid two years. From Class C upward at least half your qualifying experience has to be in the specific field you are licensing for, and college credit or extra approved training can substitute for some of it, at 32 semester hours or 40 training hours per year of experience. Every treatment facility must be operated at least five days a week by its licensed chief operator, or someone holding an equal or higher class, and that operator must be reachable by phone or pager seven days a week. Exams need 70 percent to pass and the application fee is $111.
Texas Class D, Wastewater Treatment Practice Test
Class D takes a high school diploma or GED and the Basic Wastewater Operation course, with no work experience at all. If you do not have a diploma or GED, TCEQ issues a Provisional Class D instead: no education or experience needed, $74, valid two years, and it must be upgraded before it lapses.
TCEQ · Class CTexas Class C, Wastewater Treatment Practice Test
Class C takes a high school diploma or GED plus two years of work experience, with at least half of it in the specific field you are licensing for. Core courses are Basic Wastewater Operation and either Activated Sludge or Wastewater Treatment, plus one elective. Up to one year of experience can be substituted with college credit or extra approved training.
TCEQ · Class BTexas Class B, Wastewater Treatment Practice Test
Class B takes either a relevant bachelor's degree plus two and a half years of hands-on experience, or a high school diploma plus five years of work experience with three of them hands-on. At least half must be in your specific field, and up to two years can be substituted with college credit or training.
TCEQ · Class A (highest)Texas Class A, Wastewater Treatment Practice Test
Class A has three routes and a degree is not required: a master's plus four years hands-on, a bachelor's plus five years hands-on, or a high school diploma or GED plus eight years with six hands-on. It also needs six core courses, an elective, and enough additional wastewater training to reach 160 hours. Worth planning for: the Class A exam runs six hours, and not every computer-based testing center can seat an exam longer than four.
Distribution is one of the three specialty licenses TCEQ issues at Class C and Class B, alongside Surface Water and Groundwater, and it runs the full Class D through Class A ladder. Class D needs a high school diploma or GED plus the Basic Water Operations and Resiliency Overview courses, with no prior experience. Be careful with Class D though: most are not renewable, and you cannot get a new one if you already supervise a distribution system with more than 250 connections, so distribution supervisors should plan for Class C. Class C takes two years of experience with at least one year hands-on. Class B takes either a relevant bachelor's degree plus two and a half years hands-on, or a high school diploma plus five years with three hands-on. Class A takes a master's plus four years hands-on, a bachelor's plus five, or a high school diploma plus eight years with six hands-on. In every case at least half the experience must be in the specific field you are licensing for. The application fee is $111 and the exam pass mark is 70 percent.
Texas Class D, Water Distribution Practice Test
Class D needs a high school diploma or GED plus Basic Water Operations and the Resiliency Overview, with no prior experience. Note that most Class D licenses are not renewable, and supervisors of distribution systems over 250 connections cannot obtain one.
TCEQ · Class CTexas Class C, Water Distribution Practice Test
Class C takes a high school diploma or GED plus two years of experience, one of which must be hands-on, with at least half in the distribution field. College credit or extra approved training can substitute for up to one year.
TCEQ · Class BTexas Class B, Water Distribution Practice Test
Class B takes either a relevant bachelor's degree plus two and a half years of hands-on experience, or a high school diploma plus five years with three of them hands-on.
TCEQ · Class A (highest)Texas Class A, Water Distribution Practice Test
Class A has three routes: a master's degree plus four years hands-on, a bachelor's plus five years hands-on, or a high school diploma or GED plus eight years with six of them hands-on. A degree is not required.
Wastewater collection is its own TCEQ license and it runs only three classes, I, II and III, with III the highest. That matters because wastewater treatment uses letters D through A instead, so the two ladders inside the same discipline are named completely differently. The course requirements stack as you climb, and this is verified from TCEQ's own collections requirements table. Class I needs the Wastewater Collection course plus a high school diploma or GED, with no experience at all. Class II adds Basic Wastewater Operation plus one elective, chosen from Water Utility Safety or Pump and Motor Maintenance, and two years of experience. Class III adds Water Utility Safety and Pump and Motor Maintenance as core courses plus one elective from Water Utility Management, Water Utility Calculations, Pre-treatment Facility Inspection or Intermediate Wastewater Laboratory, and takes either a bachelor's degree with two and a half years of experience or a high school diploma with five years. Every TCEQ exam needs a minimum score of 70 percent, and the application fee is $111.
Texas Class I, Wastewater Collection Practice Test
Class I is the most accessible license TCEQ issues in this discipline: the Wastewater Collection course plus a high school diploma or GED, with no experience and no elective required.
TCEQ · Class IITexas Class II, Wastewater Collection Practice Test
Class II adds Basic Wastewater Operation and one elective (Water Utility Safety or Pump and Motor Maintenance) on top of the collection course, plus two years of experience.
TCEQ · Class III (highest)Texas Class III, Wastewater Collection Practice Test
Class III is the top of the Texas collection ladder. Core courses are Basic Wastewater Operation, Wastewater Collection, Water Utility Safety and Pump and Motor Maintenance, plus one elective, with a bachelor's degree and two and a half years of experience or a high school diploma and five years.
About the Texas operator exams
Operator certification in Texas covers several disciplines, drinking water, wastewater, distribution, and collections, which may be handled by the same agency or by separate programs (drinking water is administered by TCEQ (Texas Commission on Environmental Quality), Occupational Licensing). The exact certification structure, exam format, levels, and continuing-education requirements vary by discipline and change over time, so always confirm the current scope and eligibility directly with the certifying agency. Our practice content focuses on the underlying technical material: the same operating principles, math, regulations, and process knowledge that show up on water and wastewater operator exams nationwide.
Frequently asked questions
How does Texas classify water operators?
Are these the exact questions on the Texas exam?
Are these practice tests free?
Disclaimer: WaterOperatorPracticeTest.com is an independent study aid. We are not affiliated with TCEQ (Texas Commission on Environmental Quality), Occupational Licensing or any state primacy agency. Always confirm current exam requirements with your state's certification body.