California Branch 3 Operator Exam
What is the primary focus of a California Branch 3 Operator?
Water treatment and distribution systems.
Which agency regulates Branch 3 operators in California?
The State Water Resources Control Board (SWRCB).
What is the minimum education requirement for a Branch 3 certification?
High school diploma or equivalent.
How many years of experience are generally needed for a Branch 3 certification?
Three years of acceptable water operations experience.
What type of water system is a Branch 3 operator authorized to manage?
A water treatment plant with a filtration or chemical treatment process.
Can a Branch 3 operator supervise a smaller water system?
Yes, they can supervise a Branch 1 or Branch 2 system.
What is the maximum population a Branch 3 operator typically serves?
Up to 200,000 people, depending on plant complexity.
What document outlines the laws for California water operators?
The California Safe Drinking Water Act.
What is the definition of a “public water system” under California regulations?
A system providing water for human consumption through pipes to at least 15 service
connections or serving 25 or more people for at least 60 days per year.
What is the purpose of a cross-connection control program?
To prevent contamination of the potable water supply from backflow.
,What is backflow?
The unwanted reverse flow of water or other substances into the potable water
distribution system.
Name two causes of backflow.
Backpressure and backsiphonage.
What is backsiphonage?
Backflow caused by a negative pressure (vacuum) in the supply line.
What device is commonly used to prevent backsiphonage?
An air gap.
What is the minimum vertical air gap required for a sink faucet above the flood rim?
Two times the diameter of the faucet, but not less than one inch.
What is a reduced pressure principle (RP) backflow preventer?
A device with two independently acting check valves and a relief valve.
How often must backflow preventers be tested in California?
Annually, or as specified by local regulations.
What is the maximum contaminant level (MCL) for arsenic in drinking water?
0.010 mg/L (10 ppb).
What is the MCL for nitrate as nitrogen?
10 mg/L.
What is the MCL for total coliform bacteria?
No more than 5% of monthly samples may be total coliform-positive (for systems
collecting ≥40 samples/month).
What is the action level for lead in drinking water?
0.015 mg/L (15 ppb).
, What is the action level for copper?
1.3 mg/L.
What does CT value stand for in disinfection?
Concentration of disinfectant multiplied by contact time.
What is the required CT value for virus inactivation in groundwater under the
Groundwater Rule?
Achieve 99.99% inactivation.
What chemical is most commonly used for disinfection in California?
Chlorine, though chloramines and ozone are also used.
What is breakpoint chlorination?
The point at which chlorine demand is met and free chlorine residual begins to appear.
What is a free chlorine residual?
Chlorine present as hypochlorous acid or hypochlorite ion.
What is a combined chlorine residual?
Chlorine combined with ammonia to form chloramines.
What is the typical free chlorine residual target in distribution systems?
0.2 to 0.5 mg/L.
What is the maximum free chlorine residual allowed by the EPA?
4.0 mg/L as chlorine.
What is the purpose of a chlorine demand test?
To determine the amount of chlorine needed to achieve a desired residual.
What is chloramination?
Using chloramines (monochloramine) as a secondary disinfectant.
What is the primary focus of a California Branch 3 Operator?
Water treatment and distribution systems.
Which agency regulates Branch 3 operators in California?
The State Water Resources Control Board (SWRCB).
What is the minimum education requirement for a Branch 3 certification?
High school diploma or equivalent.
How many years of experience are generally needed for a Branch 3 certification?
Three years of acceptable water operations experience.
What type of water system is a Branch 3 operator authorized to manage?
A water treatment plant with a filtration or chemical treatment process.
Can a Branch 3 operator supervise a smaller water system?
Yes, they can supervise a Branch 1 or Branch 2 system.
What is the maximum population a Branch 3 operator typically serves?
Up to 200,000 people, depending on plant complexity.
What document outlines the laws for California water operators?
The California Safe Drinking Water Act.
What is the definition of a “public water system” under California regulations?
A system providing water for human consumption through pipes to at least 15 service
connections or serving 25 or more people for at least 60 days per year.
What is the purpose of a cross-connection control program?
To prevent contamination of the potable water supply from backflow.
,What is backflow?
The unwanted reverse flow of water or other substances into the potable water
distribution system.
Name two causes of backflow.
Backpressure and backsiphonage.
What is backsiphonage?
Backflow caused by a negative pressure (vacuum) in the supply line.
What device is commonly used to prevent backsiphonage?
An air gap.
What is the minimum vertical air gap required for a sink faucet above the flood rim?
Two times the diameter of the faucet, but not less than one inch.
What is a reduced pressure principle (RP) backflow preventer?
A device with two independently acting check valves and a relief valve.
How often must backflow preventers be tested in California?
Annually, or as specified by local regulations.
What is the maximum contaminant level (MCL) for arsenic in drinking water?
0.010 mg/L (10 ppb).
What is the MCL for nitrate as nitrogen?
10 mg/L.
What is the MCL for total coliform bacteria?
No more than 5% of monthly samples may be total coliform-positive (for systems
collecting ≥40 samples/month).
What is the action level for lead in drinking water?
0.015 mg/L (15 ppb).
, What is the action level for copper?
1.3 mg/L.
What does CT value stand for in disinfection?
Concentration of disinfectant multiplied by contact time.
What is the required CT value for virus inactivation in groundwater under the
Groundwater Rule?
Achieve 99.99% inactivation.
What chemical is most commonly used for disinfection in California?
Chlorine, though chloramines and ozone are also used.
What is breakpoint chlorination?
The point at which chlorine demand is met and free chlorine residual begins to appear.
What is a free chlorine residual?
Chlorine present as hypochlorous acid or hypochlorite ion.
What is a combined chlorine residual?
Chlorine combined with ammonia to form chloramines.
What is the typical free chlorine residual target in distribution systems?
0.2 to 0.5 mg/L.
What is the maximum free chlorine residual allowed by the EPA?
4.0 mg/L as chlorine.
What is the purpose of a chlorine demand test?
To determine the amount of chlorine needed to achieve a desired residual.
What is chloramination?
Using chloramines (monochloramine) as a secondary disinfectant.
