Mercury in Illinois Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

0.885 ppb

EPA Limit

2 ppb

% Above Limit

6.1%

Risk Level

low

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

Water Quality Details

Contaminant	Mercury
Category	metal
Average Level	0.885 ppb
Maximum Level	2.556 ppb
EPA Limit (MCL)	2 ppb
% Wells Above Limit	6.1%
Affected Wells	27,450
Testing Cost	$120
Treatment Cost	$3,388
vs National Avg	-0.038 ppb (-4.1%)

Illinois Well Water Overview

Well Users

450,000

% on Well Water

8.5%

Quality Score

71/100

Highest Risk States for Mercury

#1Kentucky18.2% above limit #2Arkansas17.3% above limit #3New Mexico17.3% above limit #4Michigan15.8% above limit #5Minnesota14.3% 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 mercury a problem in Illinois well water?

In Illinois, mercury levels average 0.885 ppb, with a maximum recorded level of 2.556 ppb. The EPA limit is 2 ppb. Currently 6.1% of tested wells exceed this limit, affecting approximately 27,450 wells.

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

Testing for mercury in Illinois typically costs around $120. If treatment is needed, water treatment systems for mercury cost approximately $3,388.

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

The risk level for mercury in Illinois is rated as low. The state average of 0.885 ppb is 4.1% below the national average of 0.923 ppb.

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