Water Treatment Exam Preparation
Grade 2-FINAL EXAM STUDY GUIDE
2026/2027 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS BRAND NEW
VERSION
____ and/or _________ in a water supply can discolor laundry, cause a bad taste in the
water, and cause taste problems in beverages such as coffee and tea. -
ANSWER✅✅✅✅Iron and/or Manganese
Water systems that collect less than _____ coliform samples each month can have 1
positive sample and remain in compliance. -ANSWER✅✅✅✅40
The maximum contaminant level for bromate is _____ mg/L. -ANSWER✅✅✅✅0.010
mg/L
Water systems must provide at least _____ removal or inactivation of Giardia lamblia
cysts between a point where the raw water is not subject to recontamination by surface
water runoff and a point downstream before or at the first customer. -
ANSWER✅✅✅✅3-log
____ _______ is the best available technology for removing radium-226 and radium-
228 from a water supply. -ANSWER✅✅✅✅Lime softening
Color gives the water an unappealing appearance and indicates that _______ _______
may be present. -ANSWER✅✅✅✅dissolved organics
Water systems must provide at least 4-log removal or inactivation of viruses between a
point where the raw water is not subject to recontamination by surface water runoff and
a point downstream before or at the first customer. -ANSWER✅✅✅✅4-log
For water systems using conventional treatment or direct filtration, the turbidity level of
representative samples of a system's filtered water must be less than or equal to _____
NTU in at least 95% of the samples collected each month. -ANSWER✅✅✅✅0.3
, A public water system that does not provide filtration must have a disinfection
concentration in the distribution system, measured as total chlorine, combined chlorine,
or chlorine dioxide, which cannot be undetectable in more than _____% of the samples
each -ANSWER✅✅✅✅5%
Systems using diatomaceous earth filtration are required to have turbidity levels _____
ntu in ____% of the measurements collected each month. -ANSWER✅✅✅✅≤1.0 ntu
in 95%
Lab analysis of pH, turbidity, temperature, and residual disinfectant concentrations must
be performed by a person approved by the ______. -ANSWER✅✅✅✅State
Either the _____ or a _____ _______ certifies water treatment plant laboratories for the
measurement of total coliforms, fecal coliforms, and heterotrophic plate counts. -
ANSWER✅✅✅✅USEPA or a state agency
The time from sample collection to initiation of the fecal coliform analysis may not
exceed _____ hours. -ANSWER✅✅✅✅8 hours
Samples to be analyzed for total coliforms by the total coliform Fermentation Technique,
must be kept below _____ degrees Celsius during transit. -ANSWER✅✅✅✅10
degrees Celsius
Utilities collecting samples more frequently than annually for inorganic contaminants
determine MCL compliance by calculating a ______ ______ _______ at each
compliance sample point. -ANSWER✅✅✅✅running annual average
A Tier _ violation poses immediate risk to public health and requires a clear notification
to the public within __ ______ of learning of the violation. -ANSWER✅✅✅✅24 hours
Water systems avoiding filtration of source water must show that the turbidity of the
source water immediately before the initial point of disinfection has not exceeded __
NTU in __% of the samples analyzed in the previous 6 months. -ANSWER✅✅✅✅5.0
NTU in 90%
A Tier _ violation requires the water system to notify its customers as soon as possible,
but within 30 days of learning of the violation and continue ________ notifications as
long as the violation persists. -ANSWER✅✅✅✅quarterly
Solder or flux is considered lead free if it does not contain more than ___% lead. -
ANSWER✅✅✅✅0.2%
Grade 2-FINAL EXAM STUDY GUIDE
2026/2027 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100%
GUARANTEED PASS BRAND NEW
VERSION
____ and/or _________ in a water supply can discolor laundry, cause a bad taste in the
water, and cause taste problems in beverages such as coffee and tea. -
ANSWER✅✅✅✅Iron and/or Manganese
Water systems that collect less than _____ coliform samples each month can have 1
positive sample and remain in compliance. -ANSWER✅✅✅✅40
The maximum contaminant level for bromate is _____ mg/L. -ANSWER✅✅✅✅0.010
mg/L
Water systems must provide at least _____ removal or inactivation of Giardia lamblia
cysts between a point where the raw water is not subject to recontamination by surface
water runoff and a point downstream before or at the first customer. -
ANSWER✅✅✅✅3-log
____ _______ is the best available technology for removing radium-226 and radium-
228 from a water supply. -ANSWER✅✅✅✅Lime softening
Color gives the water an unappealing appearance and indicates that _______ _______
may be present. -ANSWER✅✅✅✅dissolved organics
Water systems must provide at least 4-log removal or inactivation of viruses between a
point where the raw water is not subject to recontamination by surface water runoff and
a point downstream before or at the first customer. -ANSWER✅✅✅✅4-log
For water systems using conventional treatment or direct filtration, the turbidity level of
representative samples of a system's filtered water must be less than or equal to _____
NTU in at least 95% of the samples collected each month. -ANSWER✅✅✅✅0.3
, A public water system that does not provide filtration must have a disinfection
concentration in the distribution system, measured as total chlorine, combined chlorine,
or chlorine dioxide, which cannot be undetectable in more than _____% of the samples
each -ANSWER✅✅✅✅5%
Systems using diatomaceous earth filtration are required to have turbidity levels _____
ntu in ____% of the measurements collected each month. -ANSWER✅✅✅✅≤1.0 ntu
in 95%
Lab analysis of pH, turbidity, temperature, and residual disinfectant concentrations must
be performed by a person approved by the ______. -ANSWER✅✅✅✅State
Either the _____ or a _____ _______ certifies water treatment plant laboratories for the
measurement of total coliforms, fecal coliforms, and heterotrophic plate counts. -
ANSWER✅✅✅✅USEPA or a state agency
The time from sample collection to initiation of the fecal coliform analysis may not
exceed _____ hours. -ANSWER✅✅✅✅8 hours
Samples to be analyzed for total coliforms by the total coliform Fermentation Technique,
must be kept below _____ degrees Celsius during transit. -ANSWER✅✅✅✅10
degrees Celsius
Utilities collecting samples more frequently than annually for inorganic contaminants
determine MCL compliance by calculating a ______ ______ _______ at each
compliance sample point. -ANSWER✅✅✅✅running annual average
A Tier _ violation poses immediate risk to public health and requires a clear notification
to the public within __ ______ of learning of the violation. -ANSWER✅✅✅✅24 hours
Water systems avoiding filtration of source water must show that the turbidity of the
source water immediately before the initial point of disinfection has not exceeded __
NTU in __% of the samples analyzed in the previous 6 months. -ANSWER✅✅✅✅5.0
NTU in 90%
A Tier _ violation requires the water system to notify its customers as soon as possible,
but within 30 days of learning of the violation and continue ________ notifications as
long as the violation persists. -ANSWER✅✅✅✅quarterly
Solder or flux is considered lead free if it does not contain more than ___% lead. -
ANSWER✅✅✅✅0.2%
