Lead In Drinking Water In California
What residents of California need to know about lead in drinking water — including how it enters water, which utilities have documented violations, and what steps to take.
Source: EPA SDWIS, State Water Resources Control Board (SWRCB), CDC · Last reviewed: 2025-01-01
Quick Answer
Is lead in drinking water a real concern in California?
Yes — particularly in older urban communities where aging service lines and household plumbing predate the 1986 federal ban on lead solder and materials.
Is this mostly a public-water issue, a private-well issue, or both?
Both public water systems and private household plumbing, depending on the age of the service connection and the home.
What is the main reason residents should care?
California's naturally corrosive water chemistry in some regions accelerates leaching from older lead service lines, lead solder, and brass fixtures even when the treatment plant delivers safe water.
Key Facts
| Federal Lead Action Level | 15 µg/L (EPA) — zero is the only safe level per CDC |
| MCLG (Maximum Contaminant Level Goal) | Zero — no safe level of lead exposure has been established |
| Primary route into water | Lead service lines; lead solder in pre-1986 plumbing; brass fixtures |
| Older housing risk | Homes built before 1986 are most likely to have lead-containing solder or fittings |
| State oversight | State Water Resources Control Board (SWRCB) |
Why This Matters in California
California's older urban cores — parts of Los Angeles, Oakland, San Francisco, and the Central Valley — have water distribution infrastructure built decades before federal lead bans took effect. Corrosive water conditions in many California service areas can dissolve lead from service lines and household plumbing fittings, meaning treated water can pick up lead between the plant and the tap. California enacted AB 746 to accelerate lead service line replacement notices, and the State Water Resources Control Board requires public systems to maintain and submit lead service line inventories.
Historical Context
California was an early adopter of stricter lead action level requirements and requires utilities to notify customers of lead service line locations. Several disadvantaged communities in the Central Valley have documented lead service line exposure.
California Utilities With Lead Violation Records
The utilities listed below have at least one lead violation on record in EPA's SDWIS database. Violations may be open or resolved — see individual utility pages for current status and risk level.
City of Stockton
Stockton · 191,302 served
City of Corona
Corona · 168,575 served
City of Roseville
Roseville · 155,612 served
City of Orange
Orange · 120,770 served
Great Oaks Wc Inc
California · 110,088 served
West Valley Water District
California · 104,498 served
City of Chino
Chino · 86,435 served
City of Upland
Upland · 78,376 served
Compton-city, Water Dept.
Compton · 74,877 served
Lynwood-city, Water Dept.
Lynwood · 66,967 served
How Lead Gets Into Drinking Water
Lead service lines
The pipe connecting a home to the water main may be made of lead, especially in pre-1986 construction. Water sitting in these lines can accumulate lead before it reaches the tap.
Lead solder
Lead solder at pipe joints was banned for potable water systems in 1986. Homes built before that date — including significant portions of older California cities — may still have lead solder throughout their plumbing.
Older brass fixtures
Faucets, valves, and fixtures with high lead content were common before the 2014 revision of 'lead-free' standards. Replacing older fixtures at kitchen and drinking taps can meaningfully reduce exposure.
Corrosive water chemistry
Soft, acidic, or low-alkalinity water dissolves lead from plumbing more readily. Utilities use orthophosphate and other corrosion control treatments, but household plumbing after the meter is not within their control.
Who Should Pay Closest Attention
Families with children under six, pregnant residents, and households in pre-1978 homes are at greatest risk. Renters in older multifamily housing often have the least visibility into the age of their building's plumbing.
Families with children under six
Pregnant residents
Households in homes built before 1986
Renters who cannot inspect building plumbing
Residents on a confirmed lead service line
Households that had plumbing work done recently (disturbances dislodge protective scale)
How to Check Your Situation in California
- 1
Identify your water utility. Use the ZIP lookup below or browse the California utility directory on this site.
- 2
Read your utility's page on this site to see its current risk level and any open lead violations.
- 3
Contact your utility and ask for your address-level service line material status. Under the federal Lead and Copper Rule Revisions (LCRR), utilities must maintain and provide this information.
- 4
Review your utility's most recent Consumer Confidence Report (CCR) — mailed annually or available on the utility's website.
- 5
Consider testing your tap water at a State Water Resources Control Board (SWRCB)-certified lab. Your state health department or State Water Resources Control Board (SWRCB) maintains a list of certified labs.
- 6
If you have young children or are pregnant, install a certified NSF/ANSI 53 or 58 filter at the kitchen tap as a precautionary measure.
Treatment Options
Boiling does not remove lead. Use a certified filter for drinking and cooking water.
NSF/ANSI Standard 53 — Activated Carbon Block
Under-sink or pitcher filters certified to Standard 53 are independently verified to reduce lead. Replace filters on the manufacturer's schedule — an overdue filter may not perform as certified.
NSF/ANSI Standard 58 — Reverse Osmosis
RO systems certified to Standard 58 remove 95–99% of lead and a broad range of contaminants. Requires under-sink installation. More comprehensive than Standard 53 for households with multiple contaminant concerns.
Flushing — temporary mitigation only
EPA recommends flushing the cold tap for 30 seconds to 2 minutes if water has sat in pipes for 6+ hours. Not a substitute for certified filtration or service line replacement.
Frequently Asked Questions
Related Pages
Lead — National Overview
All U.S. utilities with lead records
California State Overview
All utilities and water quality data
Nitrate in Drinking Water
A separate but common concern
Reverse Osmosis Guide
Removes 95–99% of lead
Activated Carbon Filter Guide
NSF/ANSI 53 certified options
All Contaminants
Complete reference library
Data Sources & Provenance
All data on this page is sourced from official U.S. government or public datasets.
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