Arsenic in North Carolina Well Water

EPA Data 2025 · Risk Level: Minimal

Avg Level

4.651 ppb

EPA Limit

10 ppb

% Above Limit

1.3%

Risk Level

minimal

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	4.651 ppb
Maximum Level	21.278 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	1.3%
Affected Wells	11,960
Testing Cost	$73
Treatment Cost	$2,885
vs National Avg	+0.408 ppb (+9.6%)

North Carolina Well Water Overview

Well Users

920,000

% on Well Water

18.5%

Quality Score

69/100

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 North Carolina well water?

In North Carolina, arsenic levels average 4.651 ppb, with a maximum recorded level of 21.278 ppb. The EPA limit is 10 ppb. Currently 1.3% of tested wells exceed this limit, affecting approximately 11,960 wells.

How much does it cost to test for arsenic in North Carolina?

Testing for arsenic in North Carolina typically costs around $73. If treatment is needed, water treatment systems for arsenic cost approximately $2,885.

What is the risk level of arsenic in North Carolina well water?

The risk level for arsenic in North Carolina is rated as minimal. The state average of 4.651 ppb is 9.6% above the national average of 4.243 ppb.

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