Lead Risk in California: Housing, Water, LCRI Data
Avg lead: 0.0025 mg/L · 7 ZIP codes over EPA limit · 66% pre-1986 housing · Updated
Data: EPA Lead and Copper Rule, CDC, U.S. Census Bureau Last verified:
ZipCheckup's lead-risk reading for California: 7 ZIP codes show tap lead above the EPA action level. Around 66% of homes predate the federal lead-solder ban.
Lead Testing Trend
Historical 90th percentile lead levels (ppb) from water systems in California.
Source: EPA ECHO Lead and Copper Rule sampling data. Values in parts per billion (ppb).
City Water Quality Map: California
Each circle represents a city. Size indicates population, color indicates water quality grade. Tap a circle for details.
Cities with Highest Lead Levels in California
| # | City | Lead (mg/L) | Over Limit | Pre-1986 | Population | |
|---|---|---|---|---|---|---|
| 1 | Loma Linda | 0.0850 | 1 | 32% | 23,470 | Details → |
| 2 | Alameda | 0.0500 | 1 | 74% | 76,876 | Details → |
| 3 | San Bernardino | 0.0225 | 1 | 73% | 255,071 | Details → |
| 4 | Cedar Glen | 0.0190 | 1 | 69% | 828 | Details → |
| 5 | Arroyo Grande | 0.0170 | 1 | 56% | 32,016 | Details → |
| 6 | Arnold | 0.0150 | 0 | 60% | 2,934 | Details → |
| 7 | Avery | 0.0150 | 0 | 79% | 265 | Details → |
| 8 | Truckee | 0.0144 | 0 | 43% | 19,231 | Details → |
| 9 | Olympic Valley | 0.0144 | 0 | 64% | 1,120 | Details → |
| 10 | Escondido | 0.0138 | 1 | 63% | 178,615 | Details → |
Lead Risk Overview
The average 90th percentile lead level across California water systems is 0.0025 mg/L - within EPA limits. Out of 1,479 ZIP codes with lead data, 7 exceed the EPA action level.
Housing Age and Lead Risk
Lead plumbing solder was banned in 1986. In California, approximately 66% of housing was built before this date, creating elevated risk of lead in residential plumbing.
Lead can enter water through:
- Lead service lines connecting water mains to homes
- Lead solder joints in copper plumbing
- Brass fixtures and faucets containing up to 8% lead (pre-2014)
With 66% of housing stock pre-1986, California has above-average risk from aging plumbing infrastructure. Targeted testing and service line replacement are priorities.
LCRI Funding and Service Line Replacement
The EPA's Lead and Copper Rule Improvements (LCRI) require water systems to inventory all service lines and replace lead lines within 10 years.
Federal funding for California:
| Metric | Value |
|---|---|
| FY2025 allotment | $28.6M |
| Additional subsidy | 49% (grants/forgiveness) |
| National total | $3.0B |
Cities with Highest Lead Levels
| Rank | City | Lead Level (mg/L) | ZIPs Over Limit | Pre-1986 Housing | Population |
|---|---|---|---|---|---|
| 1 | Loma Linda | 0.0850 EXCEEDS | 1 | 32% | 23,470 |
| 2 | Alameda | 0.0500 EXCEEDS | 1 | 74% | 76,876 |
| 3 | San Bernardino | 0.0225 EXCEEDS | 1 | 73% | 255,071 |
| 4 | Cedar Glen | 0.0190 EXCEEDS | 1 | 69% | 828 |
| 5 | Arroyo Grande | 0.0170 EXCEEDS | 1 | 56% | 32,016 |
| 6 | Arnold | 0.0150 | 0 | 60% | 2,934 |
| 7 | Avery | 0.0150 | 0 | 79% | 265 |
| 8 | Truckee | 0.0144 | 0 | 43% | 19,231 |
| 9 | Olympic Valley | 0.0144 | 0 | 64% | 1,120 |
| 10 | Escondido | 0.0138 | 1 | 63% | 178,615 |
Health Effects of Lead Exposure
Lead exposure affects every organ system. Key health risks include:
Children: Developmental delays, reduced IQ, behavioral problems, slowed growth
Adults: Kidney damage, high blood pressure, reproductive issues, nerve disorders
Pregnant women: Lead crosses the placenta and affects fetal development
How to Test for Lead
- Contact your water utility - many offer free lead testing
- Use a certified test kit ($20-$50) from a hardware store
- Hire a certified lab ($150-$400) for comprehensive testing
- Run cold water for 2+ minutes before drinking, especially in the morning
- Install a NSF/ANSI 53-certified filter rated for lead removal
Data Sources
- Lead levels: EPA Lead and Copper Rule
- Blood lead: CDC National Lead Surveillance
- LCRI funding: EPA DWSRF allotments
- Housing age: U.S. Census Bureau American Community Survey
Updated daily.
Concerned about lead in your water?
Lead levels vary by water system and housing age. Enter your ZIP code to see lead data specific to your area and find out if your water exceeds EPA limits.
Test Your Water for Lead →Frequently Asked Questions
Does California have lead in its drinking water?
The average 90th percentile lead level across California is 0.0025 mg/L (EPA action level: 0.015 mg/L). 7 ZIP codes exceed the EPA limit. Lead can enter water through older pipes and service lines even when source water is clean.
How old are homes in California?
Approximately 66% of housing in California was built before 1986, when lead solder was banned in plumbing. Older homes have higher risk of lead contamination from pipes, solder joints, and fixtures.
How much federal funding does California receive for lead pipe replacement?
California receives $28.6M in federal LCRI funding (FY2025) for lead service line inventory and replacement. 49% is available as grants or loan forgiveness.
How can I test my water for lead in California?
Local water utilities in California offer free or low-cost lead testing. Certified home test kits ($20-$50) and certified labs ($150-$400) are also available. Free testing is common, especially for homes built before 1986.