Page 1 of 110
California Branch 3 Operator Exam QUESTIONS
AND VERIFIED ANSWERS WITH RATIONALES JUST
RELEASED
California Branch 3 Operator Exam (Low-Water Use, Non-Potable Water, Recycled Water), each with
an answer and a summarized rationale based on California Code of Regulations (CCR) Title 22, Chapter
14.3, and other relevant regulations.
.
Summarized Exam Topics Covered (Point Form – Accurate for Branch 3 Exam)
• Definition of Recycled Water: Water resulting from treatment of domestic wastewater that
meets Title 22 criteria for approved uses
• Permissible Uses (Title 22 § 60301.100 – 60301.250): Irrigation (golf courses, pastures,
landscaping, food crops not eaten raw/vine-on-ground), decorative lakes/ponds (no swimming),
cooling towers (except potable water standard), toilet/urinal flushing (dual plumbing), industrial
cooling, soil compaction, dust control, ornamental fountains
• Prohibited Uses: Drinking, cooking, dishwashing, bathing, food processing for human
consumption (except raw-eaten crops with specific disinfection), swimming pools
• Treatment Levels: Primary, secondary, tertiary treatment with filtration and disinfection
(chlorine/UV/ozone)
• Disinfection Requirements: Median total coliform ≤ 2.2/100 mL (7-day); turbidity ≤ 2 NTU
(24-hour), ≤ 5 NTU (continuous)
• Dual Plumbing Systems: Purple pipe/tape, warning labels, cross-connection control, backflow
prevention, signage
• Distribution System – Separation Distances: 10 ft horizontal from potable water, 4 ft vertical
(dual distribution generally in separate trenches with 5-10 ft separation or in same trench with
10 ft separation and potable at higher elevation)
• Outfall Pipes & Discharge: Must be above grade or with air gap; identification (purple
pipe/tape)
• Cross-Connection Control: Backflow preventers (RP, DCVA, or AVB depending on hazard), air
gaps
• Inspection & Maintenance of Reclaimed Water Systems: Annual inspection of dual plumbing,
signage, cross-connection testing
• SWRCB & Local Agency Roles: Regional Water Quality Control Boards (RWQCB), Drinking Water
Division (DDW), local health departments
• Public Notification & Labeling: “Recycled Water” placards, purple pipe markers, warning tape,
caution signs at use sites
• Security & Access Control: Fencing of public accessible reservoirs without secondary treatment
• On-Site Treated Non-Potable Water Standards (Title 24): Covers rainwater, graywater,
stormwater; separate standards
• Incident Reporting: Unauthorized discharge, backflow, public exposure must be reported to
local health department and SWRCB
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1. What is the maximum allowable turbidity for recycled water used for unrestricted irrigation (e.g., golf
courses, parks) as specified in Title 22?
A) 10 NTU (24-hour average)
B) 5 NTU (continuous) and ≤ 2 NTU (24-hour average)
C) 2 NTU at all times
D) No turbidity limit for irrigation
Answer: B
Rationale: Title 22 requires turbidity ≤ 5 NTU at all times and ≤ 2 NTU (24-hour average) for tertiary
treated recycled water used for unrestricted irrigation.
2. Which of the following uses of recycled water is PROHIBITED under Title 22?
A) Toilet and urinal flushing in a commercial building with dual plumbing
B) Irrigation of a golf course
C) Indirect potable reuse via groundwater recharge (with permit)
D) Washing dishes in a restaurant
Answer: D
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Rationale: Recycled water is prohibited for dishwashing, bathing, food preparation, or any use that could
result in direct human ingestion or skin immersion (except as allowed for certain crops).
3. A recycled water pipeline runs parallel to a potable water line in the same trench. What is the
minimum horizontal separation required under Title 22?
A) 5 feet
B) 10 feet
C) 15 feet
D) 20 feet
Answer: B
Rationale: If potable and recycled water lines are in the same trench, Title 22 requires a minimum
horizontal separation of 10 feet, with the potable line placed at a higher elevation to prevent
cross-connection.
4. A public golf course uses recycled water for irrigation. What color must all recycled water pipes,
valves, and outlets be identified with?
A) Green
B) Yellow
, Page 4 of 110
C) Purple (violet)
D) Blue
Answer: C
Rationale: Recycled water distribution systems must be identified with purple (violet) color code,
including pipe, tape, markers, and signage.
5. A recycled water system serves a residential community for toilet flushing. What type of backflow
prevention device is required at each service connection?
A) Double check valve assembly (DCVA)
B) Reduced pressure principle backflow preventer (RP)
C) Atmospheric vacuum breaker (AVB)
D) No backflow prevention is required
Answer: B
Rationale: High-hazard cross-connections (non-potable to potable) require a reduced pressure principle
backflow preventer (RP) to protect the potable water system.
6. A recycled water tank that is accessible to the public (without secondary treatment) must have what
security feature?
California Branch 3 Operator Exam QUESTIONS
AND VERIFIED ANSWERS WITH RATIONALES JUST
RELEASED
California Branch 3 Operator Exam (Low-Water Use, Non-Potable Water, Recycled Water), each with
an answer and a summarized rationale based on California Code of Regulations (CCR) Title 22, Chapter
14.3, and other relevant regulations.
.
Summarized Exam Topics Covered (Point Form – Accurate for Branch 3 Exam)
• Definition of Recycled Water: Water resulting from treatment of domestic wastewater that
meets Title 22 criteria for approved uses
• Permissible Uses (Title 22 § 60301.100 – 60301.250): Irrigation (golf courses, pastures,
landscaping, food crops not eaten raw/vine-on-ground), decorative lakes/ponds (no swimming),
cooling towers (except potable water standard), toilet/urinal flushing (dual plumbing), industrial
cooling, soil compaction, dust control, ornamental fountains
• Prohibited Uses: Drinking, cooking, dishwashing, bathing, food processing for human
consumption (except raw-eaten crops with specific disinfection), swimming pools
• Treatment Levels: Primary, secondary, tertiary treatment with filtration and disinfection
(chlorine/UV/ozone)
• Disinfection Requirements: Median total coliform ≤ 2.2/100 mL (7-day); turbidity ≤ 2 NTU
(24-hour), ≤ 5 NTU (continuous)
• Dual Plumbing Systems: Purple pipe/tape, warning labels, cross-connection control, backflow
prevention, signage
• Distribution System – Separation Distances: 10 ft horizontal from potable water, 4 ft vertical
(dual distribution generally in separate trenches with 5-10 ft separation or in same trench with
10 ft separation and potable at higher elevation)
• Outfall Pipes & Discharge: Must be above grade or with air gap; identification (purple
pipe/tape)
• Cross-Connection Control: Backflow preventers (RP, DCVA, or AVB depending on hazard), air
gaps
• Inspection & Maintenance of Reclaimed Water Systems: Annual inspection of dual plumbing,
signage, cross-connection testing
• SWRCB & Local Agency Roles: Regional Water Quality Control Boards (RWQCB), Drinking Water
Division (DDW), local health departments
• Public Notification & Labeling: “Recycled Water” placards, purple pipe markers, warning tape,
caution signs at use sites
• Security & Access Control: Fencing of public accessible reservoirs without secondary treatment
• On-Site Treated Non-Potable Water Standards (Title 24): Covers rainwater, graywater,
stormwater; separate standards
• Incident Reporting: Unauthorized discharge, backflow, public exposure must be reported to
local health department and SWRCB
, Page 2 of 110
1. What is the maximum allowable turbidity for recycled water used for unrestricted irrigation (e.g., golf
courses, parks) as specified in Title 22?
A) 10 NTU (24-hour average)
B) 5 NTU (continuous) and ≤ 2 NTU (24-hour average)
C) 2 NTU at all times
D) No turbidity limit for irrigation
Answer: B
Rationale: Title 22 requires turbidity ≤ 5 NTU at all times and ≤ 2 NTU (24-hour average) for tertiary
treated recycled water used for unrestricted irrigation.
2. Which of the following uses of recycled water is PROHIBITED under Title 22?
A) Toilet and urinal flushing in a commercial building with dual plumbing
B) Irrigation of a golf course
C) Indirect potable reuse via groundwater recharge (with permit)
D) Washing dishes in a restaurant
Answer: D
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Rationale: Recycled water is prohibited for dishwashing, bathing, food preparation, or any use that could
result in direct human ingestion or skin immersion (except as allowed for certain crops).
3. A recycled water pipeline runs parallel to a potable water line in the same trench. What is the
minimum horizontal separation required under Title 22?
A) 5 feet
B) 10 feet
C) 15 feet
D) 20 feet
Answer: B
Rationale: If potable and recycled water lines are in the same trench, Title 22 requires a minimum
horizontal separation of 10 feet, with the potable line placed at a higher elevation to prevent
cross-connection.
4. A public golf course uses recycled water for irrigation. What color must all recycled water pipes,
valves, and outlets be identified with?
A) Green
B) Yellow
, Page 4 of 110
C) Purple (violet)
D) Blue
Answer: C
Rationale: Recycled water distribution systems must be identified with purple (violet) color code,
including pipe, tape, markers, and signage.
5. A recycled water system serves a residential community for toilet flushing. What type of backflow
prevention device is required at each service connection?
A) Double check valve assembly (DCVA)
B) Reduced pressure principle backflow preventer (RP)
C) Atmospheric vacuum breaker (AVB)
D) No backflow prevention is required
Answer: B
Rationale: High-hazard cross-connections (non-potable to potable) require a reduced pressure principle
backflow preventer (RP) to protect the potable water system.
6. A recycled water tank that is accessible to the public (without secondary treatment) must have what
security feature?
