Pesticides in Illinois Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

1.797 ppb

EPA Limit

3 ppb

% Above Limit

8.6%

Risk Level

moderate

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

Water Quality Details

Contaminant	Pesticides
Category	chemical
Average Level	1.797 ppb
Maximum Level	4.891 ppb
EPA Limit (MCL)	3 ppb
% Wells Above Limit	8.6%
Affected Wells	38,700
Testing Cost	$140
Treatment Cost	$3,898
vs National Avg	+0.404 ppb (+29.0%)

Illinois Well Water Overview

Well Users

450,000

% on Well Water

8.5%

Quality Score

71/100

Highest Risk States for Pesticides

#1Tennessee16.7% above limit #2Iowa16.3% above limit #3Louisiana15.0% above limit #4Colorado14.8% above limit #5Delaware13.0% 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 pesticides a problem in Illinois well water?

In Illinois, pesticides levels average 1.797 ppb, with a maximum recorded level of 4.891 ppb. The EPA limit is 3 ppb. Currently 8.6% of tested wells exceed this limit, affecting approximately 38,700 wells.

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

Testing for pesticides in Illinois typically costs around $140. If treatment is needed, water treatment systems for pesticides cost approximately $3,898.

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

The risk level for pesticides in Illinois is rated as moderate. The state average of 1.797 ppb is 29.0% above the national average of 1.393 ppb.

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