Public water system profile

SAN DIEGO, CITY OF

Explore available public water records for SAN DIEGO, CITY OF (PWSID CA3710020). Find annual reports, results listed in those reports, official sources, and clear notes about what the records can and cannot show. This page does not show conditions at a specific tap.

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System Snapshot

Available system-level context

This snapshot shows the identity and context fields currently available for SAN DIEGO, CITY OF (PWSID CA3710020). Read it with the source links and limitations below.

Last updated: Data reviewed:

System identity

PWSID
CA3710020
State
California
Linked communities
San Diego
County context
Not listed in current record
System type
Community water system
Source water
Mostly imported surface water, primarily blended Colorado River and State Water Project supplies, with a smaller imported treated-water component from regional plants
Population served context
1,385,379
Service connections
Not listed in current record
Latest reviewed report
2025 report link found
Data updated
2026-07-22

California Drinking Water Watch listed 1,385,379 people served for PWSID CA3710020 when reviewed July 19, 2026. This dated system-inventory value does not confirm service for a specific address or describe city-boundary population.

Read these as system-level fields from reviewed public records. Confirm provider and address-specific questions with official utility, city, state, or EPA sources.

Report-Listed Rows

Report-listed rows summarized from the latest reviewed report

2 report-listed rows are summarized for SAN DIEGO, CITY OF. A listed row is not the same thing as a current advisory or household tap result.

Report year
2025
Rows summarized
2
Source tables represented
2
Scope
Past reporting period
Report-row preview from the latest reviewed report for SAN DIEGO, CITY OF
Substance and testing periodReported valueRange in reportLimit or standardSource tableReport-printed status
LeadTesting period: 2023 triennial monitoringSites above action level0ND ppb90th Percentile LevelND - 1.4Action Level: 15; PHG: 0.2; DLR: 5Samples Taken From Customer TapsPage 9Typical source, as printed: Internal corrosion of household plumbing systemsViolation: NO, as printed for this sample period
Total Trihalomethanes (TTHM's)Testing period: 202555 ppbMaximum LRAA8.6 - 87.0MCL: 80; PHG: N/ADetected Disinfection Byproducts, Disinfectant Residual and Disinfection Byproduct PrecursorsPage 9Typical source, as printed: Byproduct of drinking water chlorinationViolation: NO, as printed for this report period

Report row

Lead

Range in report
ND - 1.4 ppb
90th Percentile Level
ND ppb
Testing period
2023 triennial monitoring
Sites above action level
0
Limit or standard
Action Level: 15; PHG: 0.2; DLR: 5
Report-printed status
Violation: NO, as printed for this sample period

Source · Page 9

Samples Taken From Customer Taps

Typical source, as printed: Internal corrosion of household plumbing systems

Report row

Total Trihalomethanes (TTHM's)

Range in report
8.6 - 87.0 ppb
Maximum LRAA
55 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 80; PHG: N/A
Report-printed status
Violation: NO, as printed for this report period

Source · Page 9

Detected Disinfection Byproducts, Disinfectant Residual and Disinfection Byproduct Precursors

Typical source, as printed: Byproduct of drinking water chlorination

Source report notes

Source: City of San Diego 2025 Annual Drinking Water Quality Report. Retrieved 2026-07-19.

  • Applies to: Lead

    The table lists 56 sampling sites. The printed NO and zero sites exceeding the action level apply only to the source's 2023 triennial Lead row. They do not characterize other report sections, establish current compliance or safety, or predict a result at any tap.

  • Applies to: Total Trihalomethanes (TTHM's)

    The source labels 55 as the maximum locational running annual average and prints individual measurements from 8.6 to 87.0. The printed NO is limited to this 2025 row and is not a current compliance, advisory, safety, or tap-level conclusion.

Review the linked source report for definitions, footnotes, and official wording.

Violation Records

Violation records shown on this page

This section shows 0 system-scoped violation detail records currently included for SAN DIEGO, CITY OF. Annual reports and current notices can use different timing and terminology.

No system-scoped violation detail records are included in the available reviewed records for this system. This is not an official compliance finding. Check the official utility, state, or EPA source for current compliance and notice information.

Source notes for this system mention violation-related context, but this page does not currently display separate system-scoped violation detail records.

Important limitation

Profile summary note

This page summarizes public records reviewed by this site. It does not replace official notices, utility updates, or state drinking water information.

System profile limitations

  • The bounded preview shows only Lead from the source's 2023 triennial monitoring and TTHM from 2025. Each printed NO is limited to its report-period row and is not a current system-wide compliance, advisory, safety, or tap-level conclusion.
  • Physical PDF page 4 contains separate 2023 cross-connection-control violation material. The summarized entries do not characterize the report as violation-free, and that material is not reproduced or interpreted here.
  • The report's other results, treatment context, definitions, notices, health language, and footnotes are not reproduced. Source proportions change during the year, and the TTHM value is a maximum LRAA rather than a current point sample.
  • Official provider and state links are supplied without claiming that no active advisory or other material notice exists. Those sources can change after review.
  • The San Diego relationship supports navigation only and does not prove exclusive coverage or the provider for every address.
  • Address-level service can vary. Confirm the serving provider with a bill, account portal, utility, city, or state source.
  • This page shows summarized entries from the available report. It does not include a complete contaminant or violation table.
  • Missing fields are not findings. They mean the field is not shown on this page from the records currently available.
  • This page summarizes available public records. It may not include every update, notice, or urgent official advisory.

Latest Reviewed Report

Latest reviewed report found by this site

The 2025 report found for SAN DIEGO, CITY OF summarizes a past reporting period. It is not a live alert page.

Utility reportReport data updated:

2025 Annual Drinking Water Quality Report

Open 2025 water quality report

The 2025 report link is available for SAN DIEGO, CITY OF. Use the linked source report for the full table, definitions, footnotes, and official context. This page includes summarized entries from the available report. They are not a complete copy of the report table.

Report year
2025
Summarized entries shown
2
Source name
City of San Diego 2025 Annual Drinking Water Quality Report
Source URL
Open report source
Source retrieved
2026-07-19
Last reviewed
2026-07-19

Use the linked source report for the full table, definitions, footnotes, and official context.

Data coverage

This page summarizes selected public records for this public water system. It may not include every report, update, current notice, or address-level service detail.

Latest reviewed report
2025 report link found
Report-listed rows
2 summarized report entries shown
Detailed violation records
No detailed system-scoped records displayed
Population served
Listed from reviewed source
Service connections
Not listed in current record
City context
San Diego
County context
Not listed in current record

Local Context

City and state context for this system

SAN DIEGO, CITY OF is linked here to San Diego for navigation. That relationship does not confirm the provider for a specific address; use a bill, utility portal, or official lookup source.

Linked local context

Linked communities
San Diego
County context
Not listed in current record
State context
California

Related Explainers

Related contaminants and guides

Use these explainers with SAN DIEGO, CITY OF's report year, source table, and official report. Links are limited to existing guide and contaminant pages.

Metals and inorganic chemicals

Lead

Lead is regulated through a treatment technique and tap-sampling action-level framework. A report row does not describe every tap or identify a home's plumbing.

Read the Lead contaminant guide

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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.

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Corrections

Suggest a correction or newer source

If you have a newer official report, utility source, or correction, send the source link for review. This helps keep profile summaries tied to public records.

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Evidence

Official sources and report links

Use official federal, state, utility, or report sources before treating a page as final.

Data methodology

Review source hierarchy, missing-data handling, and record limitations.

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Data limitations

See why limited records, missing fields, and current notices need careful interpretation.

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