CCCPH Hazard Assessments: What California Water Systems Must Do

Hazard assessments are the foundation of a cross-connection control program under California’s Cross-Connection Control Policy Handbook (CCCPH). They decide which customers need backflow protection, what kind, and where your testing program has to reach. If the assessments are weak, everything built on them is weak too.

This guide explains what the CCCPH requires, how deadlines differ for community and noncommunity systems, who has to sign off, and how to run assessments across a large number of connections without visiting every one.

Where the requirement comes from

The CCCPH took effect July 1, 2024, and compliance is mandatory for all California public water systems. The State Water Resources Control Board adopted a revised version on April 21, 2026, which corrected references to accrediting entities and allows some existing protections for auxiliary water supplies. Hazard assessment requirements are in CCCPH Section 3.2.1.

The handbook defines a hazard assessment as an evaluation of a user premises designed to evaluate the types and degrees of hazard at that premises.

Who has to assess what

The scope depends on your system type:

• Community water systems must conduct an initial hazard assessment of the user premises within their service area.
• Noncommunity water systems must conduct an initial hazard assessment of their water distribution system. The State Water Board’s FAQ notes that a distribution system includes the pipes, tanks, pumps, and other components that deliver water to consumers, which includes residential connections in a noncommunity system’s service area.

What each assessment must consider

Section 3.2.1(a) lists what every hazard assessment must consider:

1. whether cross-connections exist;
2. the type and use of materials handled or likely to be present on the premises;
3. how complex and accessible the piping system is;
4. access to auxiliary water supplies, pumping systems, or pressure systems;
5. distribution system conditions that make backflow more likely, such as pressure changes from main breaks or high demand, or multiple service connections that can create flow-through conditions;
6. how accessible the premises is;
7. any previous backflow incidents on the premises; and
8. the requirements and information in the CCCPH.

Each assessment must classify the premises as a high hazard cross-connection, a low hazard cross-connection, or no hazard. Appendix D of the handbook gives examples of high hazard premises. The assessment must also decide whether any existing backflow prevention assembly gives adequate protection for that degree of hazard.

That last point matters. Under Section 3.2.2, high hazard cross-connections must be protected at all times through premises containment using an air gap or a reduced pressure principle assembly, unless the handbook provides otherwise. An assessment that finds a high hazard behind an assembly that is not protective enough creates a corrective action, not just a record.

Deadlines: community and noncommunity systems differ

Community water systems do not have a fixed statewide date for the initial hazard assessment. The State Water Board FAQ says each community system must propose its own timeframe and deadline in its Cross-Connection Control Plan, and must justify it based on its resources, number of connections, and complexity. The plan must describe the process, personnel, and timeframes for completing initial and ongoing assessments.

Noncommunity water systems must complete an initial or follow-up hazard assessment within three years of the CCCPH effective date. The State Water Board FAQ states this as no later than July 1, 2027.

For context, existing public water systems were required to submit their Cross-Connection Control Plan no later than 12 months after the effective date, which was July 1, 2025. A system that has not submitted its plan, or that received an extension, should confirm its status with its DDW District Office or Local Primacy Agency.

A specialist must review every assessment

Section 3.2.1(h) requires a certified cross-connection control specialist to review or conduct each initial and follow-up hazard assessment. The specialist must make a written finding that, in their judgment, the assessment properly identified all hazards at the time, the appropriate degree of hazard, and the corresponding backflow protection.

This is separate from, and in addition to, the handbook’s other specialist requirements:

• A system with 1,000 or more service connections must develop its program in consultation with a cross-connection control specialist.
• A system with 3,000 or more service connections must have at least one specialist as a permanent or contracted employee, reachable (directly or through a designee) within one hour, and its program coordinator must be a specialist.

You do not have to visit every residential connection

Hazard assessments are required for residential connections, but the FAQ is clear that a physical, in-person assessment is not needed at every residential connection. Systems can use alternative methods such as GIS, building records, and customer surveys. If an alternative method is inconclusive or shows a potential hazard, a physical assessment may be needed.

For a community system with thousands of residential accounts, the practical approach is to:

• sort accounts by type using billing class, parcel data, and building records;
• send surveys to residential customers and track responses;
• flag any account where records or survey answers point to a possible hazard, such as a well, a pool with an auto-fill, irrigation with chemical injection, or a home business; and
• schedule physical assessments for non-residential premises and flagged residential accounts.

The State Water Board does not provide a hazard assessment template. Its FAQ points to cross-connection survey forms in industry manuals, including the USC Manual of Cross-Connection Control, AWWA M14, the IAPMO Backflow Prevention Manual, and the EPA Cross-Connection Control Manual.

Older assessments can count

Under Section 3.2.1(d), hazard assessments completed before the CCCPH was adopted may count as initial assessments, if the assessments and the backflow protection they produced are consistent with the CCCPH and your plan describes how you reviewed them. Do not discard older survey files; review them against the current criteria first.

Assessments are not one-time

After the initial assessment, a community water system must perform a new hazard assessment when:

• a premises changes account holder (excluding single-family residences);
• a premises is newly connected or reconnected;
• there is evidence the activities or materials on the premises have changed;
• backflow from the premises occurs;
• the periodic interval set in your plan comes due;
• the State Water Board requests one; or
• the system concludes an existing assessment may no longer be accurate.

The handbook does not set a fixed periodic interval. Your plan has to state one.

A noncommunity system must conduct a follow-up assessment of its distribution system when changes are made that could create a cross-connection, or when a backflow incident occurs.

These triggers mean hazard assessment is a standing process tied to new service applications, account changes, and incident response, not a single project.

How ready is your program?

The free CCCP Readiness Assessment on the Exodus tools page asks ten yes or no questions and grades your cross-connection control program on screen. The Compliance Deadline Checker shows the July 1, 2027 noncommunity date alongside your other deadlines.

Exodus performs hazard assessments in person or by approved alternative methods, and leads cross-connection control programs with certified Cross-Connection Control Specialists. Recent work includes hazard assessment programs for the City of Norwalk, the City of El Segundo, and Donner Summit Public Utility District. See Cross-Connection Control services for how a program is built, or contact us to discuss your system.