Arsenic in Pennsylvania Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

2.333 ppb

EPA Limit

10 ppb

% Above Limit

9.4%

Risk Level

moderate

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	2.333 ppb
Maximum Level	5.293 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	9.4%
Affected Wells	169,200
Testing Cost	$140
Treatment Cost	$863
vs National Avg	-1.910 ppb (-45.0%)

Pennsylvania Well Water Overview

Well Users

1,800,000

% on Well Water

19.5%

Quality Score

72/100

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 Pennsylvania well water?

In Pennsylvania, arsenic levels average 2.333 ppb, with a maximum recorded level of 5.293 ppb. The EPA limit is 10 ppb. Currently 9.4% of tested wells exceed this limit, affecting approximately 169,200 wells.

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

Testing for arsenic in Pennsylvania typically costs around $140. If treatment is needed, water treatment systems for arsenic cost approximately $863.

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

The risk level for arsenic in Pennsylvania is rated as moderate. The state average of 2.333 ppb is 45.0% below the national average of 4.243 ppb.

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