California Cross-Connection Control & Backflow Requirements

Learn California CCCPH requirements for public water systems, including cross-connection control programs, plans, hazard assessments, backflow protection, testing, certified personnel, records, and incident notification.

California public water systems must comply with the State Water Resources Control Board Cross-Connection Control Policy Handbook, commonly called the CCCPH. The handbook establishes enforceable standards intended to prevent backflow into public drinking water distribution systems.

The CCCPH became effective July 1, 2024 and was amended April 21, 2026. It applies to California public water systems and replaced the older Title 17 cross-connection-control regulations.

Purpose of the CCCPH

The primary purpose of the CCCPH is to protect public health by preventing liquids, gases, or other substances from flowing backward into a public water system's distribution system.

The policy requires public water systems to operate an organized cross-connection control program rather than rely only on individual backflow prevention assemblies.

Cross-Connection Control Is a Program

A compliant program includes multiple elements, such as:

legal authority;
a program coordinator;
hazard assessments;
appropriate backflow protection;
certified testers and specialists;
field testing and inspection;
recordkeeping;
incident response;
public outreach;
coordination with local entities.

Cross-Connection Control Program Coordinator

A public water system must designate at least one individual responsible for reporting, tracking, and other administrative duties associated with the cross-connection control program.

For a public water system with 3,000 or more service connections, the program coordinator must be a certified cross-connection control specialist.

Cross-Connection Control Specialist Requirements

A public water system with 3,000 or more service connections must have at least one cross-connection control specialist as a permanent or contracted employee. The specialist, or a designee, must be able to be contacted within one hour.

The State Water Board can also require this staffing arrangement for smaller systems based on hazard assessments or backflow-incident history.

Cross-Connection Control Plan

Each public water system must maintain a written Cross-Connection Control Plan describing how the system will implement and maintain its CCCPH program.

The plan addresses subjects such as:

program responsibilities;
hazard-assessment procedures;
legal authority;
backflow prevention assembly testing;
air-gap inspections;
recordkeeping;
backflow incident response;
public outreach;
coordination with other agencies.

Existing-System Plan Deadline

The CCCPH required existing public water systems to submit their initial Cross-Connection Control Plan no later than 12 months after the July 1, 2024 effective date unless an extension was approved.

New public water systems must submit the plan for review and approval before issuance of a domestic water supply permit.

Keep the Plan Current

The Cross-Connection Control Plan must represent the current operation of the program.

If a public water system makes a substantive revision to the plan, the revised plan must be submitted to the State Water Board for review.

Hazard Assessments

Hazard assessments identify actual and potential cross-connections and determine the degree of hazard posed to the public water system.

The assessment must classify the condition as:

high hazard;
low hazard;
no hazard.

The assessment must also determine whether existing backflow protection is adequate for the identified hazard.

Who Reviews Hazard Assessments?

A certified cross-connection control specialist must review or conduct each required initial and follow-up hazard assessment and make a written finding regarding the identified hazards and the required protection.

When Community Systems Reassess Hazards

After the initial assessment, a community water system must perform additional hazard assessments under specified conditions, including when:

a non-single-family premises changes account holder;
a premises is newly connected or reconnected;
activities or materials at a premises change;
a backflow incident occurs;
the system's plan requires periodic reassessment;
the State Water Board requests an assessment;
the existing assessment may no longer represent the current hazard.

Protection Must Match the Hazard

The required backflow protection must be no less protective than the level appropriate for the hazard identified by the assessment.

An operator should not select a backflow prevention assembly solely because it is convenient or already in inventory.

Approved Backflow Protection

The CCCPH identifies acceptable types of backflow protection and installation requirements.

Common protection methods include:

air-gap separation;
reduced-pressure principle assemblies;
double-check valve assemblies;
pressure vacuum breaker assemblies;
other approved assemblies or methods allowed by the CCCPH.

The appropriate type depends on the hazard and hydraulic condition.

Air-Gap Separation

The CCCPH defines an air gap as a physical vertical separation between the free-flowing potable-water discharge and the flood level of the receiving vessel.

The required separation is at least two times the effective opening and never less than one inch.

Annual Backflow Assembly Testing

Required backflow prevention assemblies must be field tested at least annually.

The public water system, State Water Board, or local health agency can require more frequent testing for high-hazard premises or assemblies with increased risk of failure.

Additional Testing Events

The CCCPH also requires field testing following certain events such as:

installation;
repair;
depressurization for winterizing;
permanent relocation.

Annual Air-Gap Inspection

Required air-gap separations must be visually inspected at least annually for compliance.

The inspection must be performed by a certified backflow prevention assembly tester or certified cross-connection control specialist.

New Assemblies Must Pass Before Continuous Service

A public water system must receive a passing field test before providing continuous service to a water user through a newly installed backflow prevention assembly.

Failed Assembly

When a required backflow prevention assembly fails its field test, the public water system must ensure that the assembly is repaired or replaced within the applicable CCCPH timeframe.

Operators should not treat a failed annual test as a paperwork issue. The assembly is part of the system's public-health barrier.

Certified Backflow Prevention Assembly Testers

Required field testing must be performed by certified backflow prevention assembly testers.

The public water system must ensure that testers and cross-connection control specialists used for CCCPH compliance meet the applicable California certification requirements.

California Certification Transition

From July 1, 2026 through June 30, 2027, testers and specialists used for CCCPH compliance must be certified through a certification organization recognized in California.

Beginning July 1, 2027, CCCPH compliance requires certification through organizations meeting the applicable ANSI accreditation requirements described by the State Water Board.

Tester Notification of Serious Conditions

A backflow prevention assembly tester who observes a backflow incident or an unprotected cross-connection at the assembly or before the user premises during field testing must notify the public water system as soon as possible and within 24 hours.

Recordkeeping

A public water system must maintain a recordkeeping system for its cross-connection control program.

Records can include:

hazard assessments;
backflow prevention assembly inventory;
field-test results;
air-gap inspections;
repairs and replacements;
tester and specialist information;
backflow incident documentation;
the current Cross-Connection Control Plan;
public outreach materials.

Records Must Be Available

Required cross-connection control information must be available to the State Water Board upon request.

Backflow Incident Response

The Cross-Connection Control Plan must include procedures for investigating and responding to suspected or actual backflow incidents.

Incident response can include:

evaluating customer complaints or water-quality changes;
water-quality sampling;
pressure measurements;
investigation of the source;
corrective action;
documentation;
regulatory notification.

24-Hour Incident Notification

A public water system must notify the State Water Board and local health agencies of a known or suspected backflow incident within 24 hours of the determination.

If required by the State Water Board, the public water system must also issue the applicable Tier 1 public notification.

Public Outreach and Education

The CCCPH requires public water systems to provide cross-connection-control outreach and education to staff, customers, and the community.

Methods can include:

water-bill inserts;
pamphlets;
new-customer information;
email;
Consumer Confidence Reports.

Coordination With Local Entities

Public water systems must coordinate with applicable local entities involved in cross-connection control or public-health protection.

Examples include:

local health agencies;
building officials;
plumbing officials;
fire departments;
law enforcement;
maintenance organizations.

Backsiphonage and Backpressure

The CCCPH recognizes two principal hydraulic causes of backflow.

Backsiphonage occurs when distribution-system pressure becomes sub-atmospheric or sufficiently low to draw non-potable material toward the potable system.

Backpressure occurs when pressure in a non-potable system exceeds the pressure in the potable system.

These concepts explain why main breaks, firefighting demand, pump failures, pressurized industrial systems, and similar conditions can create backflow risk.

High-Hazard Premises

High-hazard cross-connections require protection appropriate to the potential public-health consequence.

Operators should rely on the CCCPH hazard assessment and protection requirements instead of assuming all customer premises present the same level of risk.

Recycled Water and CCCPH

The CCCPH protects public drinking water systems from cross-connections with recycled-water systems.

The handbook does not replace all separate recycled-water requirements, but a public water system using or adjacent to recycled water must maintain adequate protection of its potable distribution system.

Do Not Rely on Old Title 17 Rules

California's previous cross-connection control regulations in Title 17 are no longer the operative standards for public water system CCCPH compliance.

Operators should use the current Cross-Connection Control Policy Handbook and current State Water Board guidance.

Common Exam Mistakes

Using the old Title 17 cross-connection rules instead of the current CCCPH.
Assuming a backflow prevention assembly alone constitutes a complete cross-connection control program.
Failing to maintain a current Cross-Connection Control Plan.
Skipping hazard assessments when premises conditions change.
Using protection that is less protective than the identified hazard requires.
Assuming annual testing is optional.
Allowing uncertified personnel to perform required CCCPH testing or specialist duties.
Failing to investigate a failed assembly or reported backflow incident.
Missing the 24-hour notification requirement for known or suspected backflow incidents.
Failing to maintain cross-connection control records.

A Practical Operator Review

Use the current CCCPH, amended April 21, 2026.
Maintain an active cross-connection control program and current written plan.
Identify responsible program personnel.
Perform and update hazard assessments when required.
Select protection appropriate to the identified hazard.
Maintain an accurate inventory of backflow prevention assemblies and air gaps.
Ensure required assemblies are field tested at least annually.
Ensure required air gaps are inspected at least annually.
Use properly certified testers and specialists.
Repair or replace failed assemblies promptly under CCCPH requirements.
Maintain records and make them available for State Water Board review.
Investigate suspected backflow incidents and provide required notifications.

What to Remember for the Exam

The California CCCPH became effective July 1, 2024 and was amended April 21, 2026.
The CCCPH is mandatory for California public water systems.
The CCCPH replaced the older Title 17 public-water-system cross-connection control regulations.
A public water system must operate a complete cross-connection control program.
A written Cross-Connection Control Plan is required and must remain current.
Hazard assessments classify conditions as high hazard, low hazard, or no hazard.
A certified cross-connection control specialist must review or conduct required hazard assessments.
Backflow protection must be appropriate for the identified hazard.
An air gap must be at least two times the effective opening and never less than one inch.
Required backflow prevention assemblies must be field tested at least annually.
Required air gaps must be visually inspected at least annually.
Required field tests must be performed by certified backflow prevention assembly testers.
For systems with 3,000 or more service connections, the program coordinator must be a cross-connection control specialist.
A tester observing a backflow incident or unprotected cross-connection during testing must notify the public water system as soon as possible and within 24 hours.
A public water system must notify the State Water Board and local health agencies of a known or suspected backflow incident within 24 hours of the determination.
Cross-connection control records must be maintained and available for State Water Board review.
Operators should use current CCCPH requirements rather than outdated Title 17 cross-connection summaries.