AWWA WSO Water Treatment Grades 3&4
Which disinfectant would work best against Ozone
cryptosporidium?
The pH of a water sample is greater that the Indicates the water is scale forming.
pHs so the Langlier index?
When water high in calcium bicarbonate is Sodium bicarbonate remains in the product water.
softened by ion exchange
Lime softening can effectively disinfect water The pH level is higher than 10.5
because:
A noncarbonate hardness compound is MgSO4
What term refers to the reintroduction of carbon Recarbonation
dioxide into water either during or after lime-soda
ash softening?
________is the oxidation of unprotected metal Corrosion
surfaces.
What is the cause of carbonate hardness? Calcium Bicarbonate
Which two ions are most commonly associated with Calcium and Magnesium
water hardness?
For noncarbonate hardness to be removed, what Soda Ash
must be added to remove the noncarbonated
calcium compounds?
, If a water system collects at least 40 samples per No more than 5%
month for the analyses of total coliforms, what
percentage of total coliform positive samples are
acceptable for the system to remain in
compliance with the maximum contaminant level
for total coliforms?
Water systems are required to achieve at least 4 log
____________ removal and/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.
Where are the sampling points located for Entry points to the distribution system
required sampling of organics (except
trihalomethanes) in a community water
system?
Where are the sampling point(s) located for Each entry point to the system
required sampling of natural radionuclides in a
community water system?
Continuous chlorine residual monitoringis population served is >3,300 people.
required where the water enters the distribution
system under the Surface Water Treatment Rule
when the
A community water system must post the 100,000 people.
Consumer Confidence Report on a publicly
accessible website if it serves more than
Public water systems that cannot meet the <2.0 mg/L
required removal of total organic compounds
(TOCs) can comply if the source-water TOC level
is__________________________________, calculated
quarterly as a running annual average.
The Surface Water Treatment Rule does not Chloramine disinfection
specify which of the following treatment
technology?
A regulated organic contaminant is a Tier 2 violation requiring public notification within 30 days.
concentration that exceeds the MCL
Operators must balance satisfying regulations on meeting disinfection limits.
the amount of certain chlorinated organic
compounds with
A water system using conventional filtration the treated water quarterly running average TOC is less than 2.0 mg/L.
treatment does not have to use enhanced
coagulation to achieve the total organic carbon
(TOC) percent removal if
The Stage 1 DBPR established an MCL of___for TTHM 0.08 mg/L
(total trihalomethanes).
Which disinfectant would work best against Ozone
cryptosporidium?
The pH of a water sample is greater that the Indicates the water is scale forming.
pHs so the Langlier index?
When water high in calcium bicarbonate is Sodium bicarbonate remains in the product water.
softened by ion exchange
Lime softening can effectively disinfect water The pH level is higher than 10.5
because:
A noncarbonate hardness compound is MgSO4
What term refers to the reintroduction of carbon Recarbonation
dioxide into water either during or after lime-soda
ash softening?
________is the oxidation of unprotected metal Corrosion
surfaces.
What is the cause of carbonate hardness? Calcium Bicarbonate
Which two ions are most commonly associated with Calcium and Magnesium
water hardness?
For noncarbonate hardness to be removed, what Soda Ash
must be added to remove the noncarbonated
calcium compounds?
, If a water system collects at least 40 samples per No more than 5%
month for the analyses of total coliforms, what
percentage of total coliform positive samples are
acceptable for the system to remain in
compliance with the maximum contaminant level
for total coliforms?
Water systems are required to achieve at least 4 log
____________ removal and/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.
Where are the sampling points located for Entry points to the distribution system
required sampling of organics (except
trihalomethanes) in a community water
system?
Where are the sampling point(s) located for Each entry point to the system
required sampling of natural radionuclides in a
community water system?
Continuous chlorine residual monitoringis population served is >3,300 people.
required where the water enters the distribution
system under the Surface Water Treatment Rule
when the
A community water system must post the 100,000 people.
Consumer Confidence Report on a publicly
accessible website if it serves more than
Public water systems that cannot meet the <2.0 mg/L
required removal of total organic compounds
(TOCs) can comply if the source-water TOC level
is__________________________________, calculated
quarterly as a running annual average.
The Surface Water Treatment Rule does not Chloramine disinfection
specify which of the following treatment
technology?
A regulated organic contaminant is a Tier 2 violation requiring public notification within 30 days.
concentration that exceeds the MCL
Operators must balance satisfying regulations on meeting disinfection limits.
the amount of certain chlorinated organic
compounds with
A water system using conventional filtration the treated water quarterly running average TOC is less than 2.0 mg/L.
treatment does not have to use enhanced
coagulation to achieve the total organic carbon
(TOC) percent removal if
The Stage 1 DBPR established an MCL of___for TTHM 0.08 mg/L
(total trihalomethanes).
