PFAS (Forever Chemicals) in Illinois Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

0.76 ppt

EPA Limit

4 ppt

% Above Limit

9.1%

Risk Level

moderate

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

Water Quality Details

Contaminant	PFAS (Forever Chemicals)
Category	chemical
Average Level	0.76 ppt
Maximum Level	3.453 ppt
EPA Limit (MCL)	4 ppt
% Wells Above Limit	9.1%
Affected Wells	40,950
Testing Cost	$39
Treatment Cost	$406
vs National Avg	-1.258 ppt (-62.3%)

Illinois Well Water Overview

Well Users

450,000

% on Well Water

8.5%

Quality Score

71/100

Highest Risk States for PFAS (Forever Chemicals)

#1Oklahoma18.4% above limit #2Louisiana17.1% above limit #3New Mexico14.6% above limit #4West Virginia14.3% above limit #5South Dakota14.1% 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 pfas (forever chemicals) a problem in Illinois well water?

In Illinois, pfas (forever chemicals) levels average 0.76 ppt, with a maximum recorded level of 3.453 ppt. The EPA limit is 4 ppt. Currently 9.1% of tested wells exceed this limit, affecting approximately 40,950 wells.

How much does it cost to test for pfas (forever chemicals) in Illinois?

Testing for pfas (forever chemicals) in Illinois typically costs around $39. If treatment is needed, water treatment systems for pfas (forever chemicals) cost approximately $406.

What is the risk level of pfas (forever chemicals) in Illinois well water?

The risk level for pfas (forever chemicals) in Illinois is rated as moderate. The state average of 0.76 ppt is 62.3% below the national average of 2.018 ppt.

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