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TCEQ Class C Water Operator License Exam 2025 – Study
Guide, Practice Questions & Test Prep
Prepare for your TCEQ Class C Water Operator License Exam 2025 with this comprehensive
study guide, featuring water treatment concepts, regulatory standards, sample questions,
and exam strategies to help candidates pass confidently and earn their Class C certification.
• TCEQ Class C Water Operator License
• TCEQ Class C exam prep
• Texas water operator certification
• TCEQ Class C practice questions
When diluting a strong acid always add _______ to ________ rather than the reverse - ANSWER-
Acid/Base
Normal oxygen content in the atmosphere is _______% - ANSWER-20.9
Any atmosphere that is less than ________% oxygen should not be entered without an approved self-
contained breathing apparatus - ANSWER-19.5
When chlorine gas is added to water, what compounds are formed? - ANSWER-Hydrochloric and
hypochlorous acid
The most important federal law that impacts the water utility industry is - - ANSWER-The safe drinking
water act of 1974
An example of a non-community water system is - ANSWER-Rv Park, hotel/motel, Service station
, 2|Page
The EPA requires community water systems to provide customers with an annual- - ANSWER-Consumer
confidence report
The primary reason for main line failures in the distribution system is - - ANSWER-- internal and external
corrosion
- improper backfill and lack of proper bedding
Check values on the discharge side of a pump are used to- - ANSWER-Prevent water from flowing back
through the pump when the pump is off
_____________ & ____________ acids are by products of drinking water - ANSWER-Trinalomethanes,
Haloacetic
These are ______ major underground water aquifers in Texas - ANSWER-7
Most common type of filter in a surface plant is _________ and is designed to treat and flow at- -
ANSWER-Rapid sand and designed to flow 2 gpm/ft2
Proper backwashing of a sand filter is accomplished when the filter media expands by _________ % -
ANSWER-30-50
After disinfection and flushing of super chlorinated new lines and service but prior to placing the line
into service, bacteriological samples are required. The current standard is _____________ sample for
every __________ feet of line - ANSWER-One sample every 1.000 feet of line
For cross connection control the TCEQ preferred method is - - ANSWER-Physical air gap
One microorganism in Water that is resistant to Chlorine is- - ANSWER-Cryptosporidium
All of the following are common types of water meters except - ANSWER-Inverted Parshall flume
TCEQ Class C Water Operator License Exam 2025 – Study
Guide, Practice Questions & Test Prep
Prepare for your TCEQ Class C Water Operator License Exam 2025 with this comprehensive
study guide, featuring water treatment concepts, regulatory standards, sample questions,
and exam strategies to help candidates pass confidently and earn their Class C certification.
• TCEQ Class C Water Operator License
• TCEQ Class C exam prep
• Texas water operator certification
• TCEQ Class C practice questions
When diluting a strong acid always add _______ to ________ rather than the reverse - ANSWER-
Acid/Base
Normal oxygen content in the atmosphere is _______% - ANSWER-20.9
Any atmosphere that is less than ________% oxygen should not be entered without an approved self-
contained breathing apparatus - ANSWER-19.5
When chlorine gas is added to water, what compounds are formed? - ANSWER-Hydrochloric and
hypochlorous acid
The most important federal law that impacts the water utility industry is - - ANSWER-The safe drinking
water act of 1974
An example of a non-community water system is - ANSWER-Rv Park, hotel/motel, Service station
, 2|Page
The EPA requires community water systems to provide customers with an annual- - ANSWER-Consumer
confidence report
The primary reason for main line failures in the distribution system is - - ANSWER-- internal and external
corrosion
- improper backfill and lack of proper bedding
Check values on the discharge side of a pump are used to- - ANSWER-Prevent water from flowing back
through the pump when the pump is off
_____________ & ____________ acids are by products of drinking water - ANSWER-Trinalomethanes,
Haloacetic
These are ______ major underground water aquifers in Texas - ANSWER-7
Most common type of filter in a surface plant is _________ and is designed to treat and flow at- -
ANSWER-Rapid sand and designed to flow 2 gpm/ft2
Proper backwashing of a sand filter is accomplished when the filter media expands by _________ % -
ANSWER-30-50
After disinfection and flushing of super chlorinated new lines and service but prior to placing the line
into service, bacteriological samples are required. The current standard is _____________ sample for
every __________ feet of line - ANSWER-One sample every 1.000 feet of line
For cross connection control the TCEQ preferred method is - - ANSWER-Physical air gap
One microorganism in Water that is resistant to Chlorine is- - ANSWER-Cryptosporidium
All of the following are common types of water meters except - ANSWER-Inverted Parshall flume
