TCEQ CLASS C WATER LICENSE EXAM 2026
EXAM STUDY GUIDE COMPLETE QUESTIONS
AND CORRECT ANSWERS
◉ Repeat samples must be taken at (a) the _______ ______ (b) within 5
connections upstream and (c) within 5 connections downstream.
Answer: positive point
◉ T/F: If you do not fill out the submission form completely, you risk
losing credit for the sample. Answer: True
◉ T/F: The presence of fecal coliform in a water sample indicates
fecal contamination from a human or warm-blooded animal.
Answer: True
◉ The purpose of the sample site plan is to assure bacteriological
samples are collected from ______ service connections which are
representative of the distribution system. Answer: active
◉ T/F: Keep the sample in ice or in a cooler prior to and during lab
transport because heat stimulates bacterial growth. Answer: True
,◉ The action level for lead is _______ mg/L and for copper it is _____
mg/L. Answer: ..3
◉ T/F: Low doses of heavy metals such as lead and copper can cause
damage to the central nervous system over time. Answer: True
◉ A certain group of bacteria is used to indicate the possible
presence of a pathogen--- the ________ group. Answer: Coliform
◉ Disinfection is the destruction of disease-causing microorganisms
called ______. Answer: Pathogens
◉ At room temperature chlorine is a greenish-yellow gas that is ___
times heavier than air. Answer: 2.5
◉ The State requires ________ to be kept in stock for disinfecting new
water lines. Answer: Calcium hypochlorite
◉ T/F: Hypochlorinators consist of a mixing tank and chemical
solution feed pump. Answer: True
◉ A full-face self-contained breathing apparatus or supplied air
respirator must be readily accessible outside the fire station when
chlorine gas is used. Answer: False (A full-face self-contained
, breathing apparatus (SCBA) or supplied air respirator that meets
OSHA standards shall be readily accessible outside the *chlorinator
room* when chlorine gas is used.)
◉ T/F: All public water systems must have chlorination facilities.
Answer: True
◉ If chlorine enters the eyes, flush with running cool water for at
least ___ minutes and seek medical attention. Answer: 15 minutes
◉ Liquid bleach used in PWS must be ______ approved. Answer: NSF
◉ T/F: Primary components of a gas feed chlorinator include an
injector, flowrate controller, rotameter, and mixing tank. Answer:
False (injector, vacuum regulator, flowrate controller, rotameter-
*not a mixing tank*)
◉ The maximum sustained gas withdrawal rate for pressure
transmission 150 lb cylinders is ____ lbs/day Answer: 40
◉ T/F: Utility operators use chlorine in three commercial forms:
1) pure chlorine in the liquid or gas state
2) bleach solutions
3) granular/tablet compounds Answer: True
EXAM STUDY GUIDE COMPLETE QUESTIONS
AND CORRECT ANSWERS
◉ Repeat samples must be taken at (a) the _______ ______ (b) within 5
connections upstream and (c) within 5 connections downstream.
Answer: positive point
◉ T/F: If you do not fill out the submission form completely, you risk
losing credit for the sample. Answer: True
◉ T/F: The presence of fecal coliform in a water sample indicates
fecal contamination from a human or warm-blooded animal.
Answer: True
◉ The purpose of the sample site plan is to assure bacteriological
samples are collected from ______ service connections which are
representative of the distribution system. Answer: active
◉ T/F: Keep the sample in ice or in a cooler prior to and during lab
transport because heat stimulates bacterial growth. Answer: True
,◉ The action level for lead is _______ mg/L and for copper it is _____
mg/L. Answer: ..3
◉ T/F: Low doses of heavy metals such as lead and copper can cause
damage to the central nervous system over time. Answer: True
◉ A certain group of bacteria is used to indicate the possible
presence of a pathogen--- the ________ group. Answer: Coliform
◉ Disinfection is the destruction of disease-causing microorganisms
called ______. Answer: Pathogens
◉ At room temperature chlorine is a greenish-yellow gas that is ___
times heavier than air. Answer: 2.5
◉ The State requires ________ to be kept in stock for disinfecting new
water lines. Answer: Calcium hypochlorite
◉ T/F: Hypochlorinators consist of a mixing tank and chemical
solution feed pump. Answer: True
◉ A full-face self-contained breathing apparatus or supplied air
respirator must be readily accessible outside the fire station when
chlorine gas is used. Answer: False (A full-face self-contained
, breathing apparatus (SCBA) or supplied air respirator that meets
OSHA standards shall be readily accessible outside the *chlorinator
room* when chlorine gas is used.)
◉ T/F: All public water systems must have chlorination facilities.
Answer: True
◉ If chlorine enters the eyes, flush with running cool water for at
least ___ minutes and seek medical attention. Answer: 15 minutes
◉ Liquid bleach used in PWS must be ______ approved. Answer: NSF
◉ T/F: Primary components of a gas feed chlorinator include an
injector, flowrate controller, rotameter, and mixing tank. Answer:
False (injector, vacuum regulator, flowrate controller, rotameter-
*not a mixing tank*)
◉ The maximum sustained gas withdrawal rate for pressure
transmission 150 lb cylinders is ____ lbs/day Answer: 40
◉ T/F: Utility operators use chlorine in three commercial forms:
1) pure chlorine in the liquid or gas state
2) bleach solutions
3) granular/tablet compounds Answer: True
