WATER TREATMENT GRADE 4 (ACTUAL 2025/2026) EXAM
PREP QUESTIONS AND VERIFIED ANSWERS
to prevent scale buildup magnesium hardness should be
reduced to, what level through exess-lime treatment
40 mg/L
Turbidity MCL
.3 ntu monthly or 1 ntu
chlorine mcl
1.0
Haloacetic acids (HAA5) mcl
.06
TTHM or THM mcl
.08
,chloramines cl2 mcl
4.0
chlorine dioxide CLO2 mcl
.8
chlorine as cl2
4.0
Fluoride MCL and MCLG
4.0 and 2.0
nitrate mcl
10
nitrite mcl
1
,what detail is not recorded for each filter run
expected length of filter life
how often should an operator record bed expansion
measurements, conditions and depth of media, and an
evaluation of the bed surface
quarterly
which authority suggests that the turbidity performance and
particle count in each sedimentation basin be recorded
periodically (daily every four hours hourly)?
the partnership of safe water
which standard covers materials that are in contact with water
such as coatings construction materials and components used
in processing and distrubting potable water
NSF/ANSI standard 61
how often does AWWA check that its standards are being met
by each water system in the US
they dont monitor systems adherence to standards
, total dissolved minerals in rainwater are typically
low resulting in very soft water
confined aquifer
a permeable layer between two impermeable layers
the least important issue when considering the selection of the
most suitable water treatment proccess is
legislative input
A treatment plant that incorporates coagulation sedimentation
filtration and disinfection is
an example of the multi barrier approach to treatment
Slow surface runoff
can infiltrate into ground and recharge aquifers
one common method of removing high levels of fluoride uses
activated alumina
PREP QUESTIONS AND VERIFIED ANSWERS
to prevent scale buildup magnesium hardness should be
reduced to, what level through exess-lime treatment
40 mg/L
Turbidity MCL
.3 ntu monthly or 1 ntu
chlorine mcl
1.0
Haloacetic acids (HAA5) mcl
.06
TTHM or THM mcl
.08
,chloramines cl2 mcl
4.0
chlorine dioxide CLO2 mcl
.8
chlorine as cl2
4.0
Fluoride MCL and MCLG
4.0 and 2.0
nitrate mcl
10
nitrite mcl
1
,what detail is not recorded for each filter run
expected length of filter life
how often should an operator record bed expansion
measurements, conditions and depth of media, and an
evaluation of the bed surface
quarterly
which authority suggests that the turbidity performance and
particle count in each sedimentation basin be recorded
periodically (daily every four hours hourly)?
the partnership of safe water
which standard covers materials that are in contact with water
such as coatings construction materials and components used
in processing and distrubting potable water
NSF/ANSI standard 61
how often does AWWA check that its standards are being met
by each water system in the US
they dont monitor systems adherence to standards
, total dissolved minerals in rainwater are typically
low resulting in very soft water
confined aquifer
a permeable layer between two impermeable layers
the least important issue when considering the selection of the
most suitable water treatment proccess is
legislative input
A treatment plant that incorporates coagulation sedimentation
filtration and disinfection is
an example of the multi barrier approach to treatment
Slow surface runoff
can infiltrate into ground and recharge aquifers
one common method of removing high levels of fluoride uses
activated alumina
