Water Treatment Exam Preparation
Grade 2 Questions and Answers 100%
Pass
____ 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
©️COPYRIGHT 2025, ALL RIGHTS RESERVED. 1
, 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
©️COPYRIGHT 2025, ALL RIGHTS RESERVED. 2
Grade 2 Questions and Answers 100%
Pass
____ 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
©️COPYRIGHT 2025, ALL RIGHTS RESERVED. 1
, 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
©️COPYRIGHT 2025, ALL RIGHTS RESERVED. 2
