REHS Exam - Water
Treatment questions
with complete verified
solutions (graded A+)
Define Cross-Connection - answer Non-potable water supply connecting or
contacting a potable water supply (could be from backsiphonage,
backpressure)
Nitrates in water causes which disease? - answer Blue Baby Syndrome
(methemoglobinemia)
A Public Water System (PWS) provides water for human consumption to
______ or more service connections or an average of at least _____
individuals each day for at least _______ each year - answer >= 15 service
connections
>= 25 individuals
>= 60 days
Define Public Non-Community Transient Water Supply (TWS) - answer
>=25 transient persons for >60 days/year
ex: restaurant, business that serves people water, summer camps, rest
stop, state parks and forests
Define Public Non-Community Non-Transient Water Supply (NTNCWS) -
answer >=25 same persons for >6 months/year
, ex: schools, office building in rural area
Define Public Community Water Supply - answer >=15 service connections
or serves >=25 residents
Primary Drinking Water Standards are ______________ - answer legally
enforceable standards that apply to drinking water systems
Primary standards are measured in MCLs
MCLs are used for __________ water standards. Some examples include: -
answer Primary Standards
Examples include heavy metals, bacterial concentration, disinfection
byproducts
Secondary Drinking Water Standards are _____________. Some examples
include: - answer non-enforceable guidelines regarding contaminants that
may cause cosmetic effects (skin or tooth discoloration) or aesthetic
effects (taste and odor)
Examples include odor, iron, manganese, sulfate, pH
What are the 3 sources of drinking water? - answer Surface Water
Ground Water
Ground Water under the influence of Surface Water (like a well near a
lake)
What are the basic steps of water treatment? - answer Screening
Prechlorination (micro/odor/taste/aid in settling) - optional
Aeration (optional - remove CO2/raise pH/oxides Fe & Mn/H2S)
Treatment questions
with complete verified
solutions (graded A+)
Define Cross-Connection - answer Non-potable water supply connecting or
contacting a potable water supply (could be from backsiphonage,
backpressure)
Nitrates in water causes which disease? - answer Blue Baby Syndrome
(methemoglobinemia)
A Public Water System (PWS) provides water for human consumption to
______ or more service connections or an average of at least _____
individuals each day for at least _______ each year - answer >= 15 service
connections
>= 25 individuals
>= 60 days
Define Public Non-Community Transient Water Supply (TWS) - answer
>=25 transient persons for >60 days/year
ex: restaurant, business that serves people water, summer camps, rest
stop, state parks and forests
Define Public Non-Community Non-Transient Water Supply (NTNCWS) -
answer >=25 same persons for >6 months/year
, ex: schools, office building in rural area
Define Public Community Water Supply - answer >=15 service connections
or serves >=25 residents
Primary Drinking Water Standards are ______________ - answer legally
enforceable standards that apply to drinking water systems
Primary standards are measured in MCLs
MCLs are used for __________ water standards. Some examples include: -
answer Primary Standards
Examples include heavy metals, bacterial concentration, disinfection
byproducts
Secondary Drinking Water Standards are _____________. Some examples
include: - answer non-enforceable guidelines regarding contaminants that
may cause cosmetic effects (skin or tooth discoloration) or aesthetic
effects (taste and odor)
Examples include odor, iron, manganese, sulfate, pH
What are the 3 sources of drinking water? - answer Surface Water
Ground Water
Ground Water under the influence of Surface Water (like a well near a
lake)
What are the basic steps of water treatment? - answer Screening
Prechlorination (micro/odor/taste/aid in settling) - optional
Aeration (optional - remove CO2/raise pH/oxides Fe & Mn/H2S)
