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National Drinking Water Database


Manganese in Montana


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

The Most Polluted Communities in Montana

15 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)
1Rimrock Colony
Sunburst, MT
1191 of 1180 ppb
(180 ppb)
2North Havre County Water Dist
Havre, MT
901 of 1160 ppb
(160 ppb)
3Columbia Heights Water Co
Lakeside, MT
2101 of 1125 ppb
(125 ppb)
4Town of Grass Range
Grass Range, MT
1001 of 1125 ppb
(125 ppb)
5New Rockport Colony
Choteau, MT
1331 of 175 ppb
(75 ppb)
6Town View Estates Wua Inc
Helena, MT
1751 of 150 ppb
(50 ppb)
7Town of Kevin
Kevin, MT
2301 of 140 ppb
(40 ppb)
8Brook Drive Water Assn
Kalispell, MT
271 of 130 ppb
(30 ppb)
9Prairie Falcon Acres
MT
411 of 115 ppb
(15 ppb)
10North Star Pud
MT
1571 of 110 ppb
(10 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 Montana

There are no violations reported for this contaminant in Montana