Manganese in California Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

34.367 ppb

EPA Limit

50 ppb

% Above Limit

10.7%

Risk Level

moderate

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

Water Quality Details

Contaminant	Manganese
Category	metal
Average Level	34.367 ppb
Maximum Level	135.579 ppb
EPA Limit (MCL)	50 ppb
% Wells Above Limit	10.7%
Affected Wells	128,400
Testing Cost	$145
Treatment Cost	$4,480
vs National Avg	+12.501 ppb (+57.2%)

California Well Water Overview

Well Users

1,200,000

% on Well Water

5.8%

Quality Score

75/100

Highest Risk States for Manganese

#1West Virginia20.3% above limit #2Louisiana18.2% above limit #3Alaska15.8% above limit #4Tennessee15.6% above limit #5Missouri15.5% 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 manganese a problem in California well water?

In California, manganese levels average 34.367 ppb, with a maximum recorded level of 135.579 ppb. The EPA limit is 50 ppb. Currently 10.7% of tested wells exceed this limit, affecting approximately 128,400 wells.

How much does it cost to test for manganese in California?

Testing for manganese in California typically costs around $145. If treatment is needed, water treatment systems for manganese cost approximately $4,480.

What is the risk level of manganese in California well water?

The risk level for manganese in California is rated as moderate. The state average of 34.367 ppb is 57.2% above the national average of 21.866 ppb.

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