Page 1 of 38
2026/2027 TCEQ CLASS C WATER LICENSE
EXAM CURRENT TESTING QUESTION AND
DETAILED CORRECT ANSWER (VERIFIED)
GUARANTEED PASS/TOP-RATED A+.
TCEQ CLASS C WATER
Pass with confidence the TCEQ Class C Water License Exam by
strengthening your knowledge of water treatment processes,
distribution systems, water quality standards, safety
procedures, and Texas regulations. This exam assesses practical
understanding required for operating and maintaining public
water systems. It is designed for water utility operators and
entry-level water treatment professionals seeking Class C
licensure in Texas.
Which of the following is part of a hypochlorination system?
a) solution feed pump
b) gas cylinder
c) rotameter
d) injector/ejector
e) all of the above ...... ANSWER ....... a) solution feed
pump✓ ✓
, Page 2 of 38
An elevated storage tank should be protected against
corrosion by:
a) painting
b) cathodic protection
c) water stabilization
d) all of the above
e) galvanizing ...... ANSWER ....... d) all of the above
(painting, cathodic protection, and water stabilization) ✓
✓
The pH of water indicates whether it is acidic or basic and is
expressed by a scale of numbers ranging from:
a) 0 - 7
b) 0 - 14
c) 1 - 7
d) 1 - 14
e) none of the above ...... ANSWER ....... b) 0 - 14✓ ✓
Before a new main is placed into service, it must be properly
disinfected with a minimum chlorine dosage of:
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a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L ...... ANSWER ....... a) 50 mg/L✓ ✓
A common chemical used for disinfecting a small public
water supply is:
a) soda ash
b) copper sulfate
c) sodium hypochlorite
d) fluoride
e) sodium chloride ...... ANSWER ....... c) sodium
hypochlorite✓ ✓
Gravity filters will remove which of the following from surface
water supplies:
a) turbidity
b) taste and odors
c) nitrates
, Page 4 of 38
d) hardness
e) chlorides ...... ANSWER ....... a) turbidity✓ ✓
If you added 3.5 mg/L of chlorine to your storage tank and 30
minutes later measured the residual at 1.2 mg/L, what was
the chlorine demand in the tank?
a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 ...... ANSWER ....... d) 2.3✓ ✓
Your ground storage tank is 15 feet high and 30 feet in
diameter. About how much water can it hold?
a) 31,700 gallons
b) 79,270 gallons
c) 50, 490 gallons
d) 25,150 gallons
e) 10,600 gallons
2026/2027 TCEQ CLASS C WATER LICENSE
EXAM CURRENT TESTING QUESTION AND
DETAILED CORRECT ANSWER (VERIFIED)
GUARANTEED PASS/TOP-RATED A+.
TCEQ CLASS C WATER
Pass with confidence the TCEQ Class C Water License Exam by
strengthening your knowledge of water treatment processes,
distribution systems, water quality standards, safety
procedures, and Texas regulations. This exam assesses practical
understanding required for operating and maintaining public
water systems. It is designed for water utility operators and
entry-level water treatment professionals seeking Class C
licensure in Texas.
Which of the following is part of a hypochlorination system?
a) solution feed pump
b) gas cylinder
c) rotameter
d) injector/ejector
e) all of the above ...... ANSWER ....... a) solution feed
pump✓ ✓
, Page 2 of 38
An elevated storage tank should be protected against
corrosion by:
a) painting
b) cathodic protection
c) water stabilization
d) all of the above
e) galvanizing ...... ANSWER ....... d) all of the above
(painting, cathodic protection, and water stabilization) ✓
✓
The pH of water indicates whether it is acidic or basic and is
expressed by a scale of numbers ranging from:
a) 0 - 7
b) 0 - 14
c) 1 - 7
d) 1 - 14
e) none of the above ...... ANSWER ....... b) 0 - 14✓ ✓
Before a new main is placed into service, it must be properly
disinfected with a minimum chlorine dosage of:
, Page 3 of 38
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L ...... ANSWER ....... a) 50 mg/L✓ ✓
A common chemical used for disinfecting a small public
water supply is:
a) soda ash
b) copper sulfate
c) sodium hypochlorite
d) fluoride
e) sodium chloride ...... ANSWER ....... c) sodium
hypochlorite✓ ✓
Gravity filters will remove which of the following from surface
water supplies:
a) turbidity
b) taste and odors
c) nitrates
, Page 4 of 38
d) hardness
e) chlorides ...... ANSWER ....... a) turbidity✓ ✓
If you added 3.5 mg/L of chlorine to your storage tank and 30
minutes later measured the residual at 1.2 mg/L, what was
the chlorine demand in the tank?
a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 ...... ANSWER ....... d) 2.3✓ ✓
Your ground storage tank is 15 feet high and 30 feet in
diameter. About how much water can it hold?
a) 31,700 gallons
b) 79,270 gallons
c) 50, 490 gallons
d) 25,150 gallons
e) 10,600 gallons
