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TCEQ Class D Water Operator License Exam 2026/2027 | 150+ Questions & Answers | Water Treatment, Disinfection, Wells, Distribution & Safety | Texas Commission on Environmental Quality

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This comprehensive TCEQ Class D Water Operator License Exam 2026/2027 study guide contains 150+ exam-style questions, correct answers, true-or-false items, multiple-choice questions, and calculation-based practice covering the core knowledge areas presented for Texas public water system operators. Across 30 pages, the material reviews water supply and demand, Safe Drinking Water Act concepts, TCEQ and EPA regulatory responsibilities, public water systems, potable water requirements, physical and chemical water characteristics, pH, turbidity, hardness, total dissolved solids, bacteriological monitoring, coliform organisms, pathogens, and drinking-water sampling procedures. A major section focuses on disinfection and water quality control, including chlorine dosage, demand and residual, hypochlorous acid, chloramines, sodium and calcium hypochlorite, gas chlorinators, DPD testing, chlorine safety, bacteriological samples, repeat sampling, lead and copper action levels, fluoride, trihalomethanes, and minimum distribution-system pressure. The document also examines groundwater fundamentals such as aquifers, artesian and water-table wells, permeability, static and pumping water levels, drawdown, well screens and casings, sanitary control easements, raw-water sampling taps, well disinfection, and groundwater treatment. Surface-water treatment is addressed through coagulation, sedimentation, filtration, disinfection, clear wells, turbidity control, activated carbon, algae, Giardia, Cryptosporidium, and the sequence of complete treatment processes. Distribution-system material includes storage facilities, pumps, total dynamic head, water mains, service connections, cross-connection control and backflow prevention, air gaps, flushing, pipe disinfection, meters, fire hydrants, corrosion control, and maintaining adequate pressure. The guide additionally covers operator and workplace safety, including lockout/tagout, Safety Data Sheets, the Texas Hazard Communication Act, excavation and shoring, Type C soil, confined-space entry, oxygen deficiency, traffic-control devices, flagger procedures, barricades, and daily inspection of cave-in protection. The final section provides multiple-choice application questions on hypochlorination, storage-tank corrosion, pH, main disinfection, chlorine demand, tank capacity, coliform contamination, chlorine residuals, well drawdown, surface-water oxidation, potable-water requirements, and public-water-system well equipment. For authoritative reference, these topics fall within the Texas Commission on Environmental Quality’s Occupational Licensing and Registration – Public Water System Operators program and Texas public drinking-water regulations. TCEQ provides licensing requirements, training information, examinations, and regulatory guidance for public water system operators. TCEQ Water Operator Licensing The federal regulatory foundation is the Safe Drinking Water Act, administered nationally by the U.S. Environmental Protection Agency, which establishes the framework for protecting public drinking-water supplies. EPA Safe Drinking Water Act Relevant Students: TCEQ Class D Water Operator candidates, Texas public water system operator trainees, entry-level water utility operators, groundwater system operators, water distribution personnel, municipal water employees, drinking-water treatment trainees, public works employees, environmental technology students, utility maintenance personnel, and candidates reviewing material for Texas water operator occupational licensing. Keywords: TCEQ Class D Water Operator Exam 2026, TCEQ Class D Water Operator Exam 2027, Class D Water Operator questions and answers, Texas Water Operator License Exam, TCEQ water operator practice test, Class D water license study guide, Texas public water system operator, water treatment exam questions, drinking water treatment, Safe Drinking Water Act, EPA drinking water regulations, TCEQ public water systems, potable water, water quality, chlorine disinfection, chlorine dosage, chlorine demand, chlorine residual, bacteriological sampling, coliform bacteria, water distribution systems, groundwater treatment, surface water treatment, aquifers and wells, well drawdown, coagulation, sedimentation, filtration, turbidity, cross connection control, backflow prevention, water storage tanks, water pressure, hypochlorination, water operator safety, confined space entry, excavation safety, Texas Hazard Communication Act, Class D operator certification

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Class D Water Operator
License Exam TCEQ 2026/2027
Exam Questions and Answers |
Already Graded A+



T/F: In Texas, about 75% of all water is used for commercial, industrial,

or agricultural purposes. - ANSWER ✔✔True


Water covers approximately ________ of Earth's surface. - ANSWER

✔✔71%


Drought is an extended period when a region receives a deficiency in its

________ water supply. - ANSWER ✔✔atmospheric, ground, or

surface

,T/F: Only about 1 gallon of tap water per person/day is used for drinking

and cooking - ANSWER ✔✔True


Excluding outside water use, the average household uses about

_______ gallons of water per month for inside use - ANSWER

✔✔2,000


T/F: Only 3% of all the fresh water on earth can be easily accessed for

use. - ANSWER ✔✔False (only 1%)


T/F: In 1978, the Texas Department of Health (TDH) assumed primacy

over the Safe Drinking Water Act from the EPA. - ANSWER ✔✔True


T/F: PWS officials should be pro-active in their approach to terrorism. -

ANSWER ✔✔True


_________ permits the owner of a well to pump as much water as

desired, even if the water is drained from beneath the land of others. -

ANSWER ✔✔Rule of Capture


In Texas, agricultural water demand accounts for about ___% of the total

water used. - ANSWER ✔✔57%


T/F: An example of a non-transient non-community PWS is a rural

school. - ANSWER ✔✔True

, Monitoring average and maximum daily water ______ enables us to plan

ahead for growth. - ANSWER ✔✔Demand


T/F: The Safe Drinking Water Act sets standards for drinking water

including physical, chemical, bacteriological, and radiological

characteristics. - ANSWER ✔✔True


"Potable" means water is safe to drink and has a measurable chlorine

________. - ANSWER ✔✔Residual


The plant operator is responsible for a sufficient supply of safe and

________ drinking water. - ANSWER ✔✔Palatable


T/F: The Texas State Board of Fire Insurance requires utilities that

provide fire protection to have a minimum amount of water available

based on 30 gals per person per day. - ANSWER ✔✔False (130 gals

per person per day)

T/F: The primary state regulator of water utilities is the TCEQ. -

ANSWER ✔✔True


T/F: All community and non-transient non-community PWS, regardless

of source of water, must be under the supervision of a licensed water

works operator. - ANSWER ✔✔True




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