PWSID CA0110003

CALIFORNIA WATER SERVICE - LIVERMORE

Community water system based in San Jose, CA

Service area on file with EPA: Alameda County. EPA's recorded service area can be incomplete for regional authorities. The cities and counties above are what the utility has filed with EPA; the utility may serve additional areas.

Population served: 60k
Source: Surface water
Status: Active

At a glance

2 above the safety limit, 3 detections to watch

Above the federal safety limit

PFOS

12 ng/L

PFOS is a "forever chemical" that builds up in the body. The most recent test was above the federal safety limit, and long-term exposure has been linked to cancer and other health problems.

Most recent EPA PFAS test · See details below
Above the federal safety limit

PFOA

4.8 ng/L

PFOA is a "forever chemical" that builds up in the body. The most recent test was above the federal safety limit, and long-term exposure has been linked to cancer and other health problems.

Most recent EPA PFAS test · See details below
Detected (no safe amount)

Lead

0.0075 mg/L

Public health experts agree no amount of lead in drinking water is safe. Even low levels can affect children's brain development.

Most recent lead and copper test · See details below
Detected — worth watching

PFHxS

9.8 ng/L

PFHxS was found at a level below the federal limit, but high enough to keep an eye on.

Most recent EPA PFAS test · See details below
Inventory still in progress

Lead service lines

14,400 unknown

This utility's lead service line inventory is not yet complete. Federal rules required every system to publish one by October 16, 2024.

From the utility's published inventory · See details below
Not fluoridated

Fluoride

Not added

CDC's My Water's Fluoride listing does not report this system as fluoridating its drinking water.

Per CDC My Water's Fluoride · See details below

Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.

Lead service line inventory

Service line inventory still in progress

CALIFORNIA WATER SERVICE - LIVERMORE reports 0 confirmed lead service lines, 4,489 non-lead, 14,400 unknown (total 18,889) in the EPA SDWIS service line inventory (2026Q1). EPA's Lead and Copper Rule Revisions treat unknown and galvanized-requiring-replacement lines as lead for notification and replacement scheduling until verified.

0 confirmed lead service lines
0 galvanized requiring replacement (LCRI treats these as lead)
14,400 unknown (76.2% of total)
4,489 confirmed non-lead (23.8%)
18,889 total service lines in the system

What to do if your service line might be lead

Ask your utility to check the service-line classification for your specific address. Many utilities provide a public address-lookup tool linked from the inventory page.
Get on the replacement queue. Under the LCRI, utilities must replace all lead and galvanized-requiring- replacement lines within 10 years (clock generally starts November 2027). Some prioritize requests.
Until the line is replaced: flush the tap 30 seconds after long stagnation, use cold water for drinking and cooking, and consider an NSF/ANSI 53 lead-rated tap filter.
Talk to your clinician about a blood lead test for anyone in the home, especially a pregnant person or a child under 6. Lead in drinking water guide.

Inventory data sourced from CALIFORNIA WATER SERVICE - LIVERMORE ( retrieved May 24, 2026 ; curator confidence: medium ). Confirmed against the original source automatically each month; see methodology.

Lead and copper test results

The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.

Why only lead and copper, and not arsenic, nitrate, or others?

EPA's bulk SDWIS download is the only nationwide per-system sample data they publish, and it only includes the Lead and Copper Rule table. Values for other regulated contaminants (TTHMs, nitrate, arsenic, etc.) appear on this page only when they trigger a violation. For the full per-system contaminant suite, see the utility's annual Consumer Confidence Report (link further down the page).

Most recent measurements per contaminant (Lead and Copper Rule) . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant	Most recent	Date	Risk
Lead PB90	0.0075 mg/L	December 31, 2024	Caution Lead has no safe level (MCLG=0). LCR action level is 0.015 mg/L for the 90th-percentile sample; the LCRI (Oct 2024) lowers the action level to 0.010 mg/L effective Nov 2027. Caution at any detection above LOD; concern anchored to the future LCRI value (0.010 mg/L) for forward consistency. Learn more about Lead. Source.

Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.

PFAS and emerging contaminants

This system was tested 720 times under EPA's latest PFAS monitoring program; 7 of the 30 chemicals tested were detected.

What is this testing program?

EPA's fifth Unregulated Contaminant Monitoring Rule cycle (UCMR 5, 2023 to 2025) required every public water system serving over 3,300 people to test for 29 per- and polyfluoroalkyl substances (PFAS) plus lithium; 30 chemicals in total. Most recent detection per chemical shown below.

Most recent UCMR 5 detection per contaminant . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant	Most recent detection	Date	Risk
PFOA	4.8 ng/L	April 16, 2024	Concern April 2024 final rule. MCLG=0. Caution at typical lab reporting limit (0.5 ng/L); concern at EPA MCL (4 ppt), the most conservative federal/state value. Learn more about PFOA. Source.
PFOS	12 ng/L	July 10, 2024	Concern April 2024 final rule. MCLG=0. Caution at typical lab reporting limit (0.5 ng/L); concern at EPA MCL (4 ppt). Learn more about PFOS. Source.
PFHxS	9.8 ng/L	July 10, 2024	Caution April 2024 final rule. EPA 10 ng/L MCL is contested 2025 to 2026 (pending rescission as of May 2025); value retained pending spring 2026 rulemaking. Learn more about PFHxS. Source.
PFBS	4.2 ng/L	July 10, 2024	No federal limit EPA has not set a federal drinking-water limit for this contaminant. It is among the substances EPA is studying under the Unregulated Contaminant Monitoring Rule (UCMR). See the guide for what the science currently says. Learn more about PFBS.
PFHxA	3.8 ng/L	July 10, 2024	No federal limit EPA has not set a federal drinking-water limit for this contaminant. It is among the substances EPA is studying under the Unregulated Contaminant Monitoring Rule (UCMR). See the guide for what the science currently says. Learn more about PFHxA.
PFPeA	3.5 ng/L	July 10, 2024	No federal limit EPA has not set a federal drinking-water limit for this contaminant. It is among the substances EPA is studying under the Unregulated Contaminant Monitoring Rule (UCMR). See the guide for what the science currently says. Learn more about PFPeA.
lithium	0.00906 mg/L	July 16, 2024	Below regulatory thresholds HAL only; not enforceable. UCMR-monitored. Learn more about lithium. Source.

Tested but not detected (23 contaminants)

EPA tested for these substances and every sample was below the minimum reporting level. Absence of detection does not mean true zero; it means below the laboratory's quantitation threshold.

Data from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) , last refreshed May 24, 2026.

Fluoride

Per CDC My Water's Fluoride

CALIFORNIA WATER SERVICE - LIVERMORE does not add fluoride to its drinking water.

This system has not reported adding fluoride to its water on CDC's My Water's Fluoride listing. Natural fluoride may still be present at trace levels from the source water; the utility's annual water quality report has the latest measured concentration.

Source: CDC My Water's Fluoride, listed under California Water Service - Livermore (Alameda County). Verify on CDC's site .

Area context

Alameda County, CA (2020 data)

Community water systems: 5 of 14 add fluoride
Population on fluoridated water: 1,661,514 of 1,696,829 (97.9%)

California statewide (2020 data)

Population on fluoridated water: 21,879,582 of 38,051,212 (57.5%)
Community water systems adding fluoride: 417 of 3,057

Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.

Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.

Compliance history

EPA-recorded violations against this system over the last 5 years.

How to read this section

Health-based violations are when a measured limit was exceeded; the measured concentration is shown alongside the EPA federal limit where SDWIS published it. Monitoring and reporting items are paperwork issues (missed sample dates, late filings) that do not themselves indicate unsafe water.

Clean record

No violations on file for this system in the last 5 years.

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Where to see every contaminant this utility tested for

EPA's bulk SDWIS dataset gives MyTapWater.us per-system measured values for lead and copper, plus violation records for everything else. To see every regulated contaminant this utility tested for in the past year (TTHMs, HAA5, nitrate, arsenic, fluoride, chromium, etc.) with measured values, read the utility's Consumer Confidence Report (CCR).

Every community water system is required by EPA to publish a CCR annually, by July 1, listing every contaminant they sampled, the measured value, the federal limit, and any health-based exceedances. Most utilities post the report online; some mail it with your bill.

How to find CALIFORNIA WATER SERVICE - LIVERMORE's CCR:

Search the web for "CALIFORNIA WATER SERVICE - LIVERMORE consumer confidence report" . The PDF is usually on the utility's own website.
Or call the utility directly. Their phone number is in the contact section below.

Compare nearby utilities by population served.

EAST BAY MUD
1.4M served · Alameda County
ALAMEDA COUNTY WATER DISTRICT
344k served · Alameda County
CITY OF HAYWARD
163k served · HAYWARD
DUBLIN SAN RAMON SERVICES DISTRICT
99k served · Alameda County
CITY OF PLEASANTON
77k served · PLEASANTON

Contact this utility

Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.

Administrator: HENRIE, TARRAH
Phone: 408-367-8490 x78490
Email: thenrie@calwater.com
Mailing address: 1720 NORTH FIRST STREET
SAN JOSE, CA 95112

Where this page's data comes from

Bundle released 2026-Q2, regenerated May 24, 2026. Each section above also shows its own source date so you can tell at a glance how fresh that part of the page is.

EPA SDWIS bulk download — last refreshed May 24, 2026 (system info, violations, lead and copper samples).
EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) — last refreshed May 24, 2026 (PFAS and lithium).
Lead service line inventory — last refreshed May 24, 2026 (from the utility's reported inventory).
CDC My Water's Fluoride — last refreshed May 19, 2026 (per-system Yes/No fluoridation status).
CDC Water Fluoridation Reporting System — last refreshed May 16, 2026 (state and county fluoridation aggregates).

Every value on this page is cross-verified before publication; read our methodology for the verification steps and corrections process.