Records currently available
California record snapshot
These counts describe reviewed records available on Water Quality Lookup. They are not a count of every provider, city, or county in California.
Reviewed profiles or limited identity records.
Local entry points, not service-area boundaries.
Guide sources reviewed September 12, 2026.
Cities
California city entry points currently available
These California city pages are local starting points. City boundaries and water service areas may not match, and more than one provider may serve a city.
San Diego
Start with SAN DIEGO, CITY OF, then confirm the provider for your address.
Open San DiegoFresno
Start with CITY OF FRESNO, then confirm the provider for your address.
Open FresnoLong Beach
Start with LONG BEACH UTILITIES DEPARTMENT, then confirm the provider for your address.
Open Long BeachWater systems
California public water systems currently available
These previews link to reviewed system profiles with identifiers, report-year context, sources, and limitations.
SAN DIEGO, CITY OF
PWSID CA3710020 · San Diego · Latest reviewed report 2025
View system profileCITY OF FRESNO
PWSID CA1010007 · Fresno · Latest reviewed report 2025
View system profileLONG BEACH UTILITIES DEPARTMENT
PWSID CA1910065 · Long Beach · Latest reviewed report 2025
View system profile2025 reports
Three California water supply examples
Start with the report overviews in these existing system profiles. Their source-water descriptions come from the 2025 utility reports reviewed in July 2026; they do not identify the water reaching a particular address today.
PWSID CA3710020
San Diego
The 2025 report describes a supply based mainly on imported surface water, including Colorado River and State Water Project supplies. The profile includes a selected Lead and TTHM overview, with the original sampling periods preserved.
PWSID CA1010007
Fresno
The 2025 report describes both groundwater and surface water. Use the system profile to read its selected report results and follow the official report source.
PWSID CA1910065
Long Beach
The 2025 report describes local groundwater and purchased imported surface water. Its selected HAA5 and TTHM overview keeps the report's measurements separate from current water conditions.
Continue your California lookup
Use the system directory, a plain-language guide, or the methodology page for the next step.
System directory
California public water systems
Browse the reviewed system profiles currently available for this state.
Browse systemsLookup guide
How to look up your drinking water system
Start with a utility bill, PWSID, state lookup tool, or official report so you can find the public water system behind a city or provider name.
Read the lookup guideReport guide
How to read a water quality report
A plain-English walkthrough of Consumer Confidence Reports, including report years, detected contaminants, legal limits, violations, and source notes.
Read the report guideData and trust
Sources, methodology, and limitations
See how records are sourced, reviewed, dated, and limited before using a summary.
Review methodologyStatewide context
California's public drinking water records
The State Water Resources Control Board's Division of Drinking Water and local primacy agencies oversee public water systems. State records cover a much wider set of systems than the selected profiles on this site.
2025 annual compliance report
7,294 public water systems
The state's annual report, published in July 2026, counts 7,294 public water systems active in California in 2025. These include community systems serving year-round residents and non-community systems serving places such as schools, workplaces, and campgrounds.
That is a dated statewide inventory count. It is separate from this site's available city and system records.
Compliance records
Different requirements, different violations
California's annual report separates federal drinking water requirements from California-specific requirements. It also distinguishes contaminant limits, treatment techniques, monitoring and reporting, public notification, and annual consumer reports.
A missed sample or report is different from a contaminant-limit violation. Read the rule, dates, and record details before interpreting a system's history; an annual compliance report is not a current advisory feed.
Monitoring data
A source sample is not a tap result
California publishes downloadable water-quality records alongside Drinking Water Watch. The state cautions that a raw-water result does not necessarily describe water delivered to customers: a source may be unused, treated, or blended before delivery.
Use the system, sampling point, collection date, and reported units together. A single detection also needs its follow-up context.
Official system lookup
Find a system in California Drinking Water Watch
Use the provider name or PWSID from a water bill, utility report, or provider confirmation. A city search can help you find candidates, but it does not confirm which system serves an address.
Search steps
Search by water system number
The public search offers Water System No., Water System Name, Principal County Served, Water System Type, Water System Status, and Primary Source Water Type.
- Open Drinking Water Watch and select PWS Search.
- Enter the PWSID in Water System No. For the example below, use CA3710020.
- Select Search For Water Systems and match both the system number and system name.
- Open Water System Details. Use the record's contacts, Monitoring Results, Violations/Enforcement Actions, and Consumer Confidence Reports links for the question you are checking.
Verified September 12, 2026
San Diego: CA3710020
The official search returned CA3710020 — SAN DIEGO, CITY OF. Its Water System Details page identifies San Diego as the principal county and provides administrative and Division of Drinking Water district contacts.
The number 3913 in the record's URL is an internal database identifier. CA3710020 is the public water system number to match across records.
Provider and agency contacts
Confirm service and current instructions
Ask the provider named on your bill to confirm service to the address. Use the administrative contact and DDW district or local agency shown in Drinking Water Watch if you need help finding the correct record.
For current notices and alert options, contact that provider and follow its official instructions. Annual reports and historical violation records do not establish whether a notice applies today.
Official tools
Reports, service lines, and private wells
Consumer confidence reports
Match the report to its reporting year
California's 2025 CCR guidance covers January 1 through December 31, 2025, with distribution to consumers by July 1, 2026. Publication in 2026 does not turn the report into a record of 2026 sampling.
Start with the utility's report archive or its Drinking Water Watch record. If a report is missing or you need another format or language, ask the provider for assistance; California's guidance also directs system-specific CCR questions to the responsible DDW district or local primacy agency.
Lead service lines
Read the inventory classification
The state publishes initial service-line inventory data submitted by water systems, organized into county-based files. The inventories distinguish the water system-owned and customer-owned portions of a service line.
Lead Status Unknown means one or both portions have an unknown material. It is not a confirmed lead or non-lead classification. The state notes that classifications may change with further records research and field work; ask your provider about your property's record.
State lead resources also link to inventory assistance and replacement funding for water systems. Ask your provider about any applicable local program.
PFAS monitoring
Keep monitoring and regulatory information together
California's PFAS page brings together monitoring orders, state rulemaking, notification and response levels, and federal UCMR resources. Use it to identify which monitoring program and reporting period a result belongs to.
This page does not provide an address-level PFAS result or a statewide assessment of current tap conditions.
Private wells
Use the domestic well pathway
For a private domestic well, use California's GAMA well-owner resources, which include a testing checklist, a domestic-well guide, and water-quality information. A nearby public system's report is not a test of your well.
The state's Environmental Laboratory Accreditation Program provides a laboratory search. Before arranging a sample, confirm the laboratory's current scope, the tests you need, and its collection instructions.
Source water
Ask about the source-water assessment
California's Drinking Water Source Assessment and Protection program provides the state's framework for assessing drinking-water sources. Ask your provider or drinking water district about the assessment for your system.
An assessment describes source protection and potential vulnerabilities. Use the utility report and dated monitoring records for water-quality results.
California lookup questions
Understanding California's records
Is the number in a Drinking Water Watch URL the PWSID?
Not necessarily. San Diego's record uses the internal number 3913 in its URL, while the displayed Water System No. is CA3710020. Match the displayed system number and name.
Why is a 2025 report published in 2026?
California's CCR guidance describes the prior calendar year's water quality. The 2025 report was due to consumers by July 1, 2026. Check individual result dates too: annual reports can preserve results from earlier monitoring periods.
Does an unknown service line mean it contains lead?
California defines Lead Status Unknown as a service line with one or both portions of unknown material. The classification calls for more information; it does not confirm the material. Ask your provider about the current record and how it was established.
Can a raw-water result tell me what is at my tap?
California's data guidance cautions that a source may not be used, or may be treated or blended before delivery. Keep the sampling point and date attached to the result and ask the provider how that source relates to your supply.
Official sources
Official sources for California
Use California State Water Resources Control Board and the official sources below to verify system identity, record dates, and current notices before relying on a summary.
PWSID CA3710020 · Sources for this system
City of San Diego
Utility report
PWSID CA1010007 · Sources for this system
City of Fresno
Utility report
PWSID CA1910065 · Sources for this system
Long Beach Utilities
Utility report
Statewide sources
California drinking water program
State data
State data
2025 annual compliance report — July 2026 (opens official source)
State data
State data
Water-quality data and interpretation (opens official source)
State data
Statewide sources
Reports and source protection
State data
State data
State data
State data
State data
State data
State data