Lead in Illinois Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

5.057 ppb

EPA Limit

15 ppb

% Above Limit

3.5%

Risk Level

low

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

Water Quality Details

Contaminant	Lead
Category	metal
Average Level	5.057 ppb
Maximum Level	19.24 ppb
EPA Limit (MCL)	15 ppb
% Wells Above Limit	3.5%
Affected Wells	15,750
Testing Cost	$132
Treatment Cost	$3,714
vs National Avg	-1.139 ppb (-18.4%)

Illinois Well Water Overview

Well Users

450,000

% on Well Water

8.5%

Quality Score

71/100

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 Illinois well water?

In Illinois, lead levels average 5.057 ppb, with a maximum recorded level of 19.24 ppb. The EPA limit is 15 ppb. Currently 3.5% of tested wells exceed this limit, affecting approximately 15,750 wells.

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

Testing for lead in Illinois typically costs around $132. If treatment is needed, water treatment systems for lead cost approximately $3,714.

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

The risk level for lead in Illinois is rated as low. The state average of 5.057 ppb is 18.4% below the national average of 6.196 ppb.

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