TCEQ class c water license exam Practice Questions and 100% Correct Answers – Verified

TCEQ class c water license exam Practice Questions
and 100% Correct Answers – Verified 2026-2027




A public water supply system should maintain residual pressure of
20 psi and a minimum of normal operating pressure of


ANSWERS: 35 psi


Before a new or repaired water line is placed into service, it
must be properly disinfected by providing a chlorine
dosage of _____________________________________________ and
proper detention time


ANSWERS: 50 mg/L

Water bearing formations beneath the earths surface that are used
as a source of water for public water supplies are


ANSWERS: Aquifers


The purpose of an air line on a well is


ANSWERS: Determine Water leves in the well

,The mesh size is an important feature of a well screen because
properly sized openings should


ANSWERS: Reduce the amount of Sand pumped


When treating surface Water, the process of coagularon will be
most affected by the


ANSWERS: pH, alkalinity, temperature, and chemical Dosage


A rapid sand filter should be backwashed When


ANSWERS: The loss of head gauge indicated between 6 and 10 feet


Which of the following is an acceptable disinfection residual at the
far reaches of the distribution System


ANSWERS: 0.2 mg/L free chlorine residual, 0.8 mg/L chloramine
residual when using chloramine treatment, 0.5 mg/L chloramine
for surface water supply, 0.5 mg/L free chlorine residual for
ground water Supply

,What is the approximate total volume of a circular tank in
gallons, if it is 30 feet in diameter, and 15 feet deep


ANSWERS: 79,300 gallons




You are using a chlorinator to provine a dosage of 4.0 mg/L. If
the daily Water usage is 750,000 gallons, the gas chlorinator
feed rate should be set at ____________ pounds per day.


ANSWERS: 25




One gallon of water weighs


ANSWERS: 8.34 lbs.

, One foot of water inside a storage vessel will raise a pressure
gauge at the bottom of the vessel by


ANSWERS: 0.433 lbs. (1 ft. Water creates 0.433 psi of pressure)


A raw water intake structure may not be constructed with _ feet
of a boat ramp, dock, or marina


ANSWERS: 1,000 feet


Common types of pumps for use in water wells are


ANSWERS: Vertical turbine and submersible


_________ is the natural exchange of water between the earth and air


ANSWERS: The hydraulic cycle


If and when a health hazard contamination event occurs in a
public water System, the operator must contact the state
regulatory authority within __________ hours by telephone


ANSWERS: 24 hours