Texas Water Well Driller License UPDATED Exam
With 2026/2027 Questions & Verified Answers
(GUARANTEED PASS)
Who regulates water well drilling in Texas? - VERIFIED UPDATED ANSWER -
Texas Department of Licensing and Regulation (TDLR)
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 - VERIFIED UPDATED ANSWER - a) solution feed pump
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 - VERIFIED UPDATED 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 - VERIFIED UPDATED ANSWER - b) 0 - 14
Before a new main is placed into service, it must be properly disinfected
with a minimum chlorine dosage of:
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L - VERIFIED UPDATED 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 - VERIFIED UPDATED ANSWER - c) sodium hypochlorite
Gravity filters will remove which of the following from surface water
supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides - VERIFIED UPDATED 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 - VERIFIED UPDATED 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 - VERIFIED UPDATED ANSWER - ...
When fecal coliform organisms are found in a water supply, it is an
indication that:
a) the water supply is contaminated
b) pathogenic organisms might be present
c) the water may be unsuitable for drinking
d) follow-up sampling must take place
e) all of the above - VERIFIED UPDATED ANSWER - e) all of the above
With 2026/2027 Questions & Verified Answers
(GUARANTEED PASS)
Who regulates water well drilling in Texas? - VERIFIED UPDATED ANSWER -
Texas Department of Licensing and Regulation (TDLR)
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 - VERIFIED UPDATED ANSWER - a) solution feed pump
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 - VERIFIED UPDATED 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 - VERIFIED UPDATED ANSWER - b) 0 - 14
Before a new main is placed into service, it must be properly disinfected
with a minimum chlorine dosage of:
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L - VERIFIED UPDATED 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 - VERIFIED UPDATED ANSWER - c) sodium hypochlorite
Gravity filters will remove which of the following from surface water
supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides - VERIFIED UPDATED 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 - VERIFIED UPDATED 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 - VERIFIED UPDATED ANSWER - ...
When fecal coliform organisms are found in a water supply, it is an
indication that:
a) the water supply is contaminated
b) pathogenic organisms might be present
c) the water may be unsuitable for drinking
d) follow-up sampling must take place
e) all of the above - VERIFIED UPDATED ANSWER - e) all of the above
