Lead in California Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

3.073 ppb

EPA Limit

15 ppb

% Above Limit

6.4%

Risk Level

low

Live DataLast updated: April 4, 2026·Source: EPA SDWIS & USGS

Water Quality Details

Contaminant	Lead
Category	metal
Average Level	3.073 ppb
Maximum Level	9.348 ppb
EPA Limit (MCL)	15 ppb
% Wells Above Limit	6.4%
Affected Wells	76,800
Testing Cost	$82
Treatment Cost	$3,519
vs National Avg	-3.123 ppb (-50.4%)

California Well Water Overview

Well Users

1,200,000

% on Well Water

5.8%

Quality Score

75/100

Highest Risk States for Lead

#1Louisiana19.1% above limit #2West Virginia18.8% above limit #3Indiana16.7% above limit #4Maine13.8% above limit #5Tennessee13.8% above limit

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EPA SDWIS & USGS

📊

WellWaterPeek Research TeamData Specialists

Our team analyzes data from EPA SDWIS & USGS to deliver accurate, up-to-date information. All data is verified and cross-referenced with official sources.

✓ EPA SDWIS & USGS✓ Updated 2025

Frequently Asked Questions

Is lead a problem in California well water?

In California, lead levels average 3.073 ppb, with a maximum recorded level of 9.348 ppb. The EPA limit is 15 ppb. Currently 6.4% of tested wells exceed this limit, affecting approximately 76,800 wells.

How much does it cost to test for lead in California?

Testing for lead in California typically costs around $82. If treatment is needed, water treatment systems for lead cost approximately $3,519.

What is the risk level of lead in California well water?

The risk level for lead in California is rated as low. The state average of 3.073 ppb is 50.4% below the national average of 6.196 ppb.

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