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National Drinking Water Database


Manganese in Maryland


Manganese is a naturally occurring element released from mineral deposits as well as industrial use.

The Most Polluted Communities in Maryland

26 water utilities reported detecting Manganese in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Manganese level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Deer Lodge Mobile Home Park
Herndon, MD
961 of 1850 ppb
(850 ppb)
2Lavale Sanitary Commission
Lavale, MD
5,5001 of 1750 ppb
(750 ppb)
3New Dominion School
Oldtown, MD
852 of 2255 ppb
(170 to 340 ppb)
4Bayside-Queenslanding
Stevensville, MD
1,0301 of 1250 ppb
(250 ppb)
5City of Aberdeen
Aberdeen, MD
14,5002 of 2195 ppb
(40 to 350 ppb)
6Town of Hampstead
Hampstead, MD
6,0622 of 2137.5 ppb
(75 to 200 ppb)
7Steeplechase Waterworks
Salisbury, MD
2601 of 1136 ppb
(136 ppb)
8Barrelville
Mt. Savage, MD
1302 of 2130 ppb
(130 ppb)
9Misty Meadows 1 / Highland Hills M.H.P.
Kingsville, MD
4602 of 2115 ppb
(80 to 150 ppb)
10Newark
Berlin, MD
2501 of 1108 ppb
(108 ppb)

Health Based Limits for Manganese

StandardDescriptionLevel
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.50 ppb
National Secondary Drinking Water RegulationsA National Secondary Drinking Water Regulation is a non-enforceable guideline regarding contaminants that may cause cosmetic effects (such as taste, odor, or color). Some states choose to adopt them as enforceable standards. Source: U.S. Environmental Protection Agency. 50 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.300 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.300 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1600 ppb

Violation Summary for Manganese in Maryland

There are no violations reported for this contaminant in Maryland