Arsenic in Louisiana Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

3.173 ppb

EPA Limit

10 ppb

% Above Limit

4.9%

Risk Level

low

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	3.173 ppb
Maximum Level	10.964 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	4.9%
Affected Wells	12,250
Testing Cost	$131
Treatment Cost	$341
vs National Avg	-1.070 ppb (-25.2%)

Louisiana Well Water Overview

Well Users

250,000

% on Well Water

12.8%

Quality Score

61/100

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 Louisiana well water?

In Louisiana, arsenic levels average 3.173 ppb, with a maximum recorded level of 10.964 ppb. The EPA limit is 10 ppb. Currently 4.9% of tested wells exceed this limit, affecting approximately 12,250 wells.

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

Testing for arsenic in Louisiana typically costs around $131. If treatment is needed, water treatment systems for arsenic cost approximately $341.

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

The risk level for arsenic in Louisiana is rated as low. The state average of 3.173 ppb is 25.2% below the national average of 4.243 ppb.

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