1.6 Public Water System Types, Permits & the Sanitary Survey

What Counts as a Public Water System

California Health and Safety Code section 116275 defines a public water system (PWS) as a system for the provision of water for human consumption through pipes or other constructed conveyances that has 15 or more service connections or regularly serves at least 25 individuals daily at least 60 days out of the year. Either trigger is sufficient; you do not need both.

Everything downstream - which regulations apply, which monitoring is required, whether a certified operator is required, and what grade that operator must hold - depends on which category the system falls into.

[!IMPORTANT] Who regulates whom. The Division of Drinking Water (or a Local Primacy Agency, a county delegated primacy for small systems) regulates public water systems. State small water systems are regulated by the county, not by DDW. And operator certification requirements attach to community and NTNC systems - a transient non-community campground still has water quality obligations but does not need a certified chief operator. Exam questions frequently pair a facility description with "does this require a D2 operator?"

The Domestic Water Supply Permit

Every public water system operates under a domestic water supply permit issued by the State Water Board (or the Local Primacy Agency). The permit is the legal instrument that ties a specific system to specific sources, facilities, treatment, and monitoring.

An amended permit is required before a system makes a material change: adding or abandoning a source, adding or modifying treatment, materially expanding the distribution system, or changing the way it delivers water. Article 2 of the Waterworks Standards (sections 64552-64558) sets the permit application content, including the technical, managerial, and financial (TMF) capacity demonstration.

Technical, managerial, and financial capacity is the framework regulators use to decide whether a system can reliably deliver safe water over the long term:

• Technical: adequate and reliable source, sound infrastructure, and appropriately certified operators
• Managerial: clear ownership, accountable staffing, effective links to customers and regulators
• Financial: revenue sufficiency, credit-worthiness, and fiscal controls

Operators sit squarely in the technical leg. A system that loses its certified chief operator has a TMF deficiency, not merely a staffing inconvenience.

The Sanitary Survey

Sanitary survey appears by name in the Water Quality / Water Sources category of the distribution Expected Range of Knowledge, which carries 10 questions at D1-D3 and 15 questions at D4-D5. It is also a required element of federal and state oversight.

A sanitary survey is an on-site review of a public water system's water source, facilities, equipment, operation, maintenance, monitoring, and management, conducted by the regulator to evaluate the system's capability to produce and distribute safe drinking water. The classic eight elements are:

1. Source - well construction and protection, intake structure, source water quality
2. Treatment - unit processes, chemical feed, redundancy, ability to meet applicable rules
3. Distribution system - mains, valves, hydrants, pressure zones, cross-connection control
4. Finished water storage - covers, vents, screens, hatches, overflow air gaps, turnover
5. Pumps, pump facilities, and controls - capacity, condition, standby power
6. Monitoring, reporting, and data verification - sample siting plan, chain of custody, records
7. System management and operation - O&M plan, emergency response plan, staffing
8. Operator compliance with State requirements - certified chief and shift operators at the correct grade

[!TIP] Element 8 is why operator certification questions show up in a "sanitary survey" question stem. A system that is staffed one grade too low has a sanitary survey deficiency even if every water quality result is perfect.

Community and NTNC systems are surveyed on a recurring cycle (systems with a strong compliance record and an approved source protection program can qualify for a longer interval). Deficiencies are classified by severity, and significant deficiencies must be corrected on a schedule set by the regulator. Under the Revised Total Coliform Rule, a sanitary survey finding of a significant deficiency is one of the events that can require corrective action reporting.

The Watershed Sanitary Survey Is a Different Document

Do not confuse the two. A watershed sanitary survey is required of public water systems using surface water or groundwater under the direct influence of surface water, and it evaluates the watershed rather than the system: land uses, discharges, recreational activity, wildlife, fire history, and contamination sources upstream of the intake. Under Title 22 it must be completed and submitted to the Division of Drinking Water every five years, with an interim update in between for many systems.

Consecutive Systems and Wholesale Arrangements

A consecutive system buys all or part of its finished water from another public water system rather than treating its own. California has hundreds of them, and they raise recurring operator questions:

• A consecutive system still needs its own certified distribution operators at the grade matching its own distribution classification.
• For a wholesaler, the population used to classify the distribution system includes customers served through its retailers (22 CCR 64413.3(a)). That is how a wholesale agency can classify far higher than its own direct connection count would suggest.
• Disinfectant residual, disinfection byproduct, and coliform compliance responsibilities are shared, and the wholesaler and consecutive system must coordinate monitoring under the Stage 2 DBP Rule and the Revised Total Coliform Rule.
• A consecutive system that adds a booster disinfection facility has added treatment, which affects both its permit and potentially its treatment classification points.