CLASS D WATER OPERATOR LICENSE
EXAM TCEQ QUESTIONS AND
ANSWERS
T/F: Turbidity must be limited because it shelters and nourishes bacteria and
interferes with disinfection. - Answer-True
T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. -
Answer-False (flaming requires less contact time)
T/F: The "primary limits" refer to chemicals with maximum contaminant levels that
can be exceeded. - Answer-False (refers to chemicals with maximum contaminant
levels (MCLs) that *CANNOT* be exceeded.)
T/F: The term "total coliform" means fecal and non-fecal coliform. - Answer-True
T/F: Pathogens are disease-causing microorganisms. - Answer-True
If a routine sample is positive, flush the positive sample point, check the chlorine
residual, then resample within 24 days of notification. - Answer-False (If a routine
sample is total coliform-positive, the PWS should flush the positive sample point,
check the chlorine residual, then resample within *24 hrs* of notification)
To prevent the formation of THMS in surface water, chlorine is combined with _____
forming chloramine, combined chlorine residual. - Answer-Ammonia
If there is no chlorine ______ at a faucet, do not sample, flush longer. - Answer-
residual
T/F: All repeat samples must be collected on successive days. - Answer-False
(Collect all repeat sample on the same day)
In the event of distribution pressure below ___ psi, _______ outages, repeated bad
samples or chlorine _____ below minimum, special precautions must be instituted. -
Answer-20/water/residual
Get the sample to the lab within ___________ or it will be rejected. - Answer-30
hours (for BacT samples)
At 0.8 - 1.0 mg/L, fluoride reduces dental cavities, but in higher doeses (>2.0 mg/L)
can cause _____ of teeth over time. - Answer-mottling
T/F: One by-product of chlorinated drinking water is trihalomethane, a suspected
carcinogen. - Answer-True
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
EXAM TCEQ QUESTIONS AND
ANSWERS
T/F: Turbidity must be limited because it shelters and nourishes bacteria and
interferes with disinfection. - Answer-True
T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. -
Answer-False (flaming requires less contact time)
T/F: The "primary limits" refer to chemicals with maximum contaminant levels that
can be exceeded. - Answer-False (refers to chemicals with maximum contaminant
levels (MCLs) that *CANNOT* be exceeded.)
T/F: The term "total coliform" means fecal and non-fecal coliform. - Answer-True
T/F: Pathogens are disease-causing microorganisms. - Answer-True
If a routine sample is positive, flush the positive sample point, check the chlorine
residual, then resample within 24 days of notification. - Answer-False (If a routine
sample is total coliform-positive, the PWS should flush the positive sample point,
check the chlorine residual, then resample within *24 hrs* of notification)
To prevent the formation of THMS in surface water, chlorine is combined with _____
forming chloramine, combined chlorine residual. - Answer-Ammonia
If there is no chlorine ______ at a faucet, do not sample, flush longer. - Answer-
residual
T/F: All repeat samples must be collected on successive days. - Answer-False
(Collect all repeat sample on the same day)
In the event of distribution pressure below ___ psi, _______ outages, repeated bad
samples or chlorine _____ below minimum, special precautions must be instituted. -
Answer-20/water/residual
Get the sample to the lab within ___________ or it will be rejected. - Answer-30
hours (for BacT samples)
At 0.8 - 1.0 mg/L, fluoride reduces dental cavities, but in higher doeses (>2.0 mg/L)
can cause _____ of teeth over time. - Answer-mottling
T/F: One by-product of chlorinated drinking water is trihalomethane, a suspected
carcinogen. - Answer-True
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
