TCEQ Class C Water License TEST STUDY
GUIDE 2026/2027 COMPLETE QUESTIONS
WITH CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. State Agency responsince for enforcing the safe drinking water act in Texas
- ANSWER Texas Commission on environmental Quality
2. What minerals can cause water hardness - ANSWER Calcium and
magnesium
3. A public water system must at all times provide - ANSWER Adequate
quantity of water, pressure, and disinfection
4. A source groundwater would be - ANSWER aquifer
5. Fecal coliform organisms sometimes found in water supplies are an
indication that - ANSWER Water supply is contaminated, harmful bacteria
may be present, possible pathogenic organisms in the water, water is
unsuitable for drinking
6. A disease that may be spread by inadequately disinfected water - ANSWER
Dysentery
,7. A common chemical used in disinfection of small water supply is -
ANSWER Calcium hypochlorite
8. A physical connection between a potable water supply and house well would
be - ANSWER A cross connection
9. The amount of chlorine in mg/L that is used up by reacting with iron
organics of bacteria is called - ANSWER Demand
10.Which of the following is a physical characteristic of chlorine gas -
ANSWER Greenish-Yellow Color, heavier than air, pungent penetrating
odor, corrosive
11.A groundwater well is currently pumping 1,000 gallons per minute. Convert
1,000 gpm to million gallons per day (MGD) - ANSWER 1.44 MGD
12.It is desirable for pH of treated water to be above _______ otherwise
_______ conditions will exist - ANSWER 7.0 and corrosive
13.Fluorides are naturally occurring in some groundwater. Fluorides in drinking
water should not exceed - ANSWER 4.0 mg/L
14.Red water or red stains may be caused by _________ levels in water -
ANSWER Iron
15.When chemicals are used at a water treatment plant a _______ day supply
should be kept on hand at all times to comply with State standards -
ANSWER 30
,16.The presence of iron in water is most commonly treated by - ANSWER
Aeration
17.A common chemical oxidizer is - ANSWER Potassium permanganate
18.If groundwater is to be treated for several problems, the first process should
be - ANSWER Aeration
19.Excess fluoride in water may be removed by - ANSWER Activated alumina
20.Trihalomethanes are formed by the reaction of _______ with organic
chemicals - ANSWER Free available Chlorine
21.TCEQ requests a water system to have disinfection equipment capable of
providing at least _______% greater capacity than the highest expected
dosage at any time - ANSWER 50
22.The rotometer on a gas chlorinator indicates the number of _______ of
chlorine fed during a _______ period - ANSWER Pounds/24 hours
23.A dosage of 4.0 mg/l is added to 750,000 gallons of water. How many
pounds of chlorine are needed? - ANSWER 25 pounds
If you enter a pump structure and hear a noise that sounds like there is gravel
going through the pump or a distinctive pinging sounds; this pump is:
a. In need of bearings
b. In need of packing
c. Experiencing Low Voltage
d. Most likely single phasing
e. Cavitating - ANSWER e. Cavitating
, 24.Water Hammer is pressure surges typically caused by:
a. Abrupt stopping of a pump or rapid closing of a valve
b. Improper pump rotation or malfunctioning valves
c. Pressure too high on discharge & improper sized check valve
d. Malfunctioning Air Relief Valve & Partially closed gate valve
e. All the above - ANSWER a. Abrupt stopping of a pump or rapid
closing of a valve
25.The MOST common type of pump that you will find in the water system is:
a. Positive Displacement
b. Submersible
c. Centrifugal
d. Gear Reduction
e. Diaphragm - ANSWER c. Centrifugal
26.________ predict how a pump will perform with changes in head, pgm,
impeller speed, impeller diameter, pump efficiency and suction head.
a. Pump Curves
b. Manufacturers
c. System Dynamics
d. Elevations
e. All the above - ANSWER a. Pump Curves
27.Most electric motors that you come in contact with are known as:
a. Hamster Cage Induction
b. DC Initiation
c. Synchronous
d. Squirrel Cage Induction
e. None of the above - ANSWER d. Squirrel Cage Induction
28.A pump and motor combination that is found at the bottom of a well and
pushes the water to the surface is known as:
a. Hollow shaft turbine
GUIDE 2026/2027 COMPLETE QUESTIONS
WITH CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. State Agency responsince for enforcing the safe drinking water act in Texas
- ANSWER Texas Commission on environmental Quality
2. What minerals can cause water hardness - ANSWER Calcium and
magnesium
3. A public water system must at all times provide - ANSWER Adequate
quantity of water, pressure, and disinfection
4. A source groundwater would be - ANSWER aquifer
5. Fecal coliform organisms sometimes found in water supplies are an
indication that - ANSWER Water supply is contaminated, harmful bacteria
may be present, possible pathogenic organisms in the water, water is
unsuitable for drinking
6. A disease that may be spread by inadequately disinfected water - ANSWER
Dysentery
,7. A common chemical used in disinfection of small water supply is -
ANSWER Calcium hypochlorite
8. A physical connection between a potable water supply and house well would
be - ANSWER A cross connection
9. The amount of chlorine in mg/L that is used up by reacting with iron
organics of bacteria is called - ANSWER Demand
10.Which of the following is a physical characteristic of chlorine gas -
ANSWER Greenish-Yellow Color, heavier than air, pungent penetrating
odor, corrosive
11.A groundwater well is currently pumping 1,000 gallons per minute. Convert
1,000 gpm to million gallons per day (MGD) - ANSWER 1.44 MGD
12.It is desirable for pH of treated water to be above _______ otherwise
_______ conditions will exist - ANSWER 7.0 and corrosive
13.Fluorides are naturally occurring in some groundwater. Fluorides in drinking
water should not exceed - ANSWER 4.0 mg/L
14.Red water or red stains may be caused by _________ levels in water -
ANSWER Iron
15.When chemicals are used at a water treatment plant a _______ day supply
should be kept on hand at all times to comply with State standards -
ANSWER 30
,16.The presence of iron in water is most commonly treated by - ANSWER
Aeration
17.A common chemical oxidizer is - ANSWER Potassium permanganate
18.If groundwater is to be treated for several problems, the first process should
be - ANSWER Aeration
19.Excess fluoride in water may be removed by - ANSWER Activated alumina
20.Trihalomethanes are formed by the reaction of _______ with organic
chemicals - ANSWER Free available Chlorine
21.TCEQ requests a water system to have disinfection equipment capable of
providing at least _______% greater capacity than the highest expected
dosage at any time - ANSWER 50
22.The rotometer on a gas chlorinator indicates the number of _______ of
chlorine fed during a _______ period - ANSWER Pounds/24 hours
23.A dosage of 4.0 mg/l is added to 750,000 gallons of water. How many
pounds of chlorine are needed? - ANSWER 25 pounds
If you enter a pump structure and hear a noise that sounds like there is gravel
going through the pump or a distinctive pinging sounds; this pump is:
a. In need of bearings
b. In need of packing
c. Experiencing Low Voltage
d. Most likely single phasing
e. Cavitating - ANSWER e. Cavitating
, 24.Water Hammer is pressure surges typically caused by:
a. Abrupt stopping of a pump or rapid closing of a valve
b. Improper pump rotation or malfunctioning valves
c. Pressure too high on discharge & improper sized check valve
d. Malfunctioning Air Relief Valve & Partially closed gate valve
e. All the above - ANSWER a. Abrupt stopping of a pump or rapid
closing of a valve
25.The MOST common type of pump that you will find in the water system is:
a. Positive Displacement
b. Submersible
c. Centrifugal
d. Gear Reduction
e. Diaphragm - ANSWER c. Centrifugal
26.________ predict how a pump will perform with changes in head, pgm,
impeller speed, impeller diameter, pump efficiency and suction head.
a. Pump Curves
b. Manufacturers
c. System Dynamics
d. Elevations
e. All the above - ANSWER a. Pump Curves
27.Most electric motors that you come in contact with are known as:
a. Hamster Cage Induction
b. DC Initiation
c. Synchronous
d. Squirrel Cage Induction
e. None of the above - ANSWER d. Squirrel Cage Induction
28.A pump and motor combination that is found at the bottom of a well and
pushes the water to the surface is known as:
a. Hollow shaft turbine
