Arsenic in New Hampshire Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

4.503 ppb

EPA Limit

10 ppb

% Above Limit

7.7%

Risk Level

low

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	4.503 ppb
Maximum Level	21.386 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	7.7%
Affected Wells	26,180
Testing Cost	$107
Treatment Cost	$3,615
vs National Avg	+0.260 ppb (+6.1%)

New Hampshire Well Water Overview

Well Users

340,000

% on Well Water

39.8%

Quality Score

75/100

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 New Hampshire well water?

In New Hampshire, arsenic levels average 4.503 ppb, with a maximum recorded level of 21.386 ppb. The EPA limit is 10 ppb. Currently 7.7% of tested wells exceed this limit, affecting approximately 26,180 wells.

How much does it cost to test for arsenic in New Hampshire?

Testing for arsenic in New Hampshire typically costs around $107. If treatment is needed, water treatment systems for arsenic cost approximately $3,615.

What is the risk level of arsenic in New Hampshire well water?

The risk level for arsenic in New Hampshire is rated as low. The state average of 4.503 ppb is 6.1% above the national average of 4.243 ppb.

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