Mercury in Pennsylvania Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

0.487 ppb

EPA Limit

2 ppb

% Above Limit

6.3%

Risk Level

low

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

Water Quality Details

Contaminant	Mercury
Category	metal
Average Level	0.487 ppb
Maximum Level	2.326 ppb
EPA Limit (MCL)	2 ppb
% Wells Above Limit	6.3%
Affected Wells	113,400
Testing Cost	$140
Treatment Cost	$2,783
vs National Avg	-0.436 ppb (-47.2%)

Pennsylvania Well Water Overview

Well Users

1,800,000

% on Well Water

19.5%

Quality Score

72/100

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 Pennsylvania well water?

In Pennsylvania, mercury levels average 0.487 ppb, with a maximum recorded level of 2.326 ppb. The EPA limit is 2 ppb. Currently 6.3% of tested wells exceed this limit, affecting approximately 113,400 wells.

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

Testing for mercury in Pennsylvania typically costs around $140. If treatment is needed, water treatment systems for mercury cost approximately $2,783.

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

The risk level for mercury in Pennsylvania is rated as low. The state average of 0.487 ppb is 47.2% below the national average of 0.923 ppb.

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