Mercury in North Carolina Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

1.154 ppb

EPA Limit

2 ppb

% Above Limit

10.1%

Risk Level

moderate

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

Water Quality Details

Contaminant	Mercury
Category	metal
Average Level	1.154 ppb
Maximum Level	3.653 ppb
EPA Limit (MCL)	2 ppb
% Wells Above Limit	10.1%
Affected Wells	92,920
Testing Cost	$47
Treatment Cost	$3,116
vs National Avg	+0.231 ppb (+25.0%)

North Carolina Well Water Overview

Well Users

920,000

% on Well Water

18.5%

Quality Score

69/100

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 North Carolina well water?

In North Carolina, mercury levels average 1.154 ppb, with a maximum recorded level of 3.653 ppb. The EPA limit is 2 ppb. Currently 10.1% of tested wells exceed this limit, affecting approximately 92,920 wells.

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

Testing for mercury in North Carolina typically costs around $47. If treatment is needed, water treatment systems for mercury cost approximately $3,116.

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

The risk level for mercury in North Carolina is rated as moderate. The state average of 1.154 ppb is 25.0% above the national average of 0.923 ppb.

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