Mercury in Maine Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

1.581 ppb

EPA Limit

2 ppb

% Above Limit

6.4%

Risk Level

low

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

Water Quality Details

Contaminant	Mercury
Category	metal
Average Level	1.581 ppb
Maximum Level	3.173 ppb
EPA Limit (MCL)	2 ppb
% Wells Above Limit	6.4%
Affected Wells	20,480
Testing Cost	$133
Treatment Cost	$4,632
vs National Avg	+0.658 ppb (+71.3%)

Maine Well Water Overview

Well Users

320,000

% on Well Water

42.5%

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 Maine well water?

In Maine, mercury levels average 1.581 ppb, with a maximum recorded level of 3.173 ppb. The EPA limit is 2 ppb. Currently 6.4% of tested wells exceed this limit, affecting approximately 20,480 wells.

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

Testing for mercury in Maine typically costs around $133. If treatment is needed, water treatment systems for mercury cost approximately $4,632.

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

The risk level for mercury in Maine is rated as low. The state average of 1.581 ppb is 71.3% above the national average of 0.923 ppb.

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