Arsenic in Illinois Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

2.227 ppb

EPA Limit

10 ppb

% Above Limit

9.0%

Risk Level

moderate

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	2.227 ppb
Maximum Level	7.835 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	9.0%
Affected Wells	40,500
Testing Cost	$97
Treatment Cost	$837
vs National Avg	-2.016 ppb (-47.5%)

Illinois Well Water Overview

Well Users

450,000

% on Well Water

8.5%

Quality Score

71/100

Highest Risk States for Arsenic

#1Iowa17.4% above limit #2Georgia15.8% above limit #3Missouri15.8% above limit #4Alabama15.4% above limit #5Colorado14.0% 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 arsenic a problem in Illinois well water?

In Illinois, arsenic levels average 2.227 ppb, with a maximum recorded level of 7.835 ppb. The EPA limit is 10 ppb. Currently 9.0% of tested wells exceed this limit, affecting approximately 40,500 wells.

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

Testing for arsenic in Illinois typically costs around $97. If treatment is needed, water treatment systems for arsenic cost approximately $837.

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

The risk level for arsenic in Illinois is rated as moderate. The state average of 2.227 ppb is 47.5% below the national average of 4.243 ppb.

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