Is manganese a problem in Connecticut drinking water?

Manganese was detected in Connecticut water systems but within the EPA limit of 50 µg/L (SMCL / health advisory). Check the ZIP code table on this page for area-specific data.

How widespread is manganese in Connecticut water?

Manganese was detected in 42 ZIP codes across Connecticut. No ZIPs exceeded the EPA limit. See the table above for details.

Manganese · Connecticut

Manganese in Connecticut Drinking Water — 42 ZIPs Te...

EPA data analysis for manganese in Connecticut drinking water systems

ZIPs with Detections

ZIPs with Violations

50 µg/L (SMCL / health advisory)

EPA Limit

Moderate

Health Risk

Oxidation Filter or Reverse Osmosis

Best Filter Method

Manganese Contamination in Connecticut

ZipCheckup analyzed drinking water data across 433 ZIP codes in Connecticut for manganese contamination. 42 ZIP codes have reported manganese detections, and 0 have EPA violations on record.

EPA Standard for Manganese

The EPA maximum contaminant level (MCL) for manganese is 50 µg/L (SMCL / health advisory), governed by the Secondary Drinking Water Standards. Water systems that exceed this limit must take corrective action and notify consumers.

Worst ZIP Codes for Manganese in Connecticut

These ZIP codes reported the highest manganese levels in Connecticut based on CCR reports and EPA data:

Lowest Manganese Levels in Connecticut

These ZIP codes had the lowest reported manganese detections in Connecticut:

Health Effects of Manganese

At elevated levels, manganese causes neurological effects similar to Parkinson's disease (tremors, difficulty walking). Infants and children are most vulnerable — studies link high manganese in water to lower IQ and behavioral problems.

How to Remove Manganese From Drinking Water

The most effective treatment for manganese removal is Oxidation Filter or Reverse Osmosis. Look for filters certified under NSF 42 / NSF 58 standards.

Check Your ZIP Code

Use the ZipCheckup water quality search to see manganese data for your specific water system in Connecticut.

Worst ZIP Codes for Manganese in Connecticut

Ranked by highest manganese detection level.

Rank	ZIP Code	City	Level Detected	EPA Limit	Status
1	06401	Ansonia	0.03 ppm	0.05 ppm	Within Limit
2	06405	Branford	0.03 ppm	0.05 ppm	Within Limit
3	06410	Cheshire	0.03 ppm	0.05 ppm	Within Limit
4	06418	Derby	0.03 ppm	0.05 ppm	Within Limit
5	06460	Milford	0.03 ppm	0.05 ppm	Within Limit
6	06461	Milford	0.03 ppm	0.05 ppm	Within Limit
7	06471	North Branford	0.03 ppm	0.05 ppm	Within Limit
8	06472	Northford	0.03 ppm	0.05 ppm	Within Limit
9	06477	Orange	0.03 ppm	0.05 ppm	Within Limit
10	06483	Seymour	0.03 ppm	0.05 ppm	Within Limit
11	06501	New Haven	0.03 ppm	0.05 ppm	Within Limit
12	06502	New Haven	0.03 ppm	0.05 ppm	Within Limit
13	06503	New Haven	0.03 ppm	0.05 ppm	Within Limit
14	06504	New Haven	0.03 ppm	0.05 ppm	Within Limit
15	06505	New Haven	0.03 ppm	0.05 ppm	Within Limit
16	06506	New Haven	0.03 ppm	0.05 ppm	Within Limit
17	06507	New Haven	0.03 ppm	0.05 ppm	Within Limit
18	06508	New Haven	0.03 ppm	0.05 ppm	Within Limit
19	06509	New Haven	0.03 ppm	0.05 ppm	Within Limit
20	06510	New Haven	0.03 ppm	0.05 ppm	Within Limit

Lowest Manganese Levels in Connecticut

ZIP Code	City	Level Detected
06540	New Haven	0.03 ppm
06538	New Haven	0.03 ppm
06537	New Haven	0.03 ppm
06536	New Haven	0.03 ppm
06535	New Haven	0.03 ppm
06534	New Haven	0.03 ppm
06533	New Haven	0.03 ppm
06532	New Haven	0.03 ppm
06531	New Haven	0.03 ppm
06530	New Haven	0.03 ppm

Connecticut Water Quality Overview: See statewide water quality rankings on the Connecticut water quality page.

Learn more about Manganese: Read the full guide on Manganese in drinking water.

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