The Power of Information

National Drinking Water Database

Copper in Montana

Copper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits. [read more]

The Most Polluted Communities in Montana

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

Ranked by highest average Copper level

RankSystem Population Served Positive test results of total reported tests Average Level
1Basin County Water and Sewer Dist
Basin, MT
3008 of 81887.52 ppb
(30 to 3288.33 ppb)
2Crystal Springs Water System
Billings, MT
3274 of 41301.5 ppb
(105 to 2301 ppb)
3Wards Cove Water Users
Hamilton, MT
456 of 61289.86 ppb
(20 to 3200 ppb)
4City of Wolf Point
Wolf Point, MT
3,91519 of 191117.76 ppb
(263 to 4630 ppb)
5City of Boulder
Boulder, MT
1,40015 of 151036.09 ppb
(382.5 to 2100 ppb)
6Firelight Meadows Llc
Big Sky, MT
3505 of 5977.13 ppb
(260 to 1751.67 ppb)
7Elk Meadows Ranchettes
Missoula, MT
17516 of 16934.53 ppb
(278.9 to 2720 ppb)
8Foys Lakeside Estates Hoa
Kalispell, MT
4721 of 21860.29 ppb
(360 to 2850 ppb)
9Town of Twin Bridges
Twin Bridges, MT
4242 of 2846.25 ppb
(642.5 to 1050 ppb)
10Town of Darby
Darby, MT
70018 of 19754.91 ppb
(0 to 1427.06 ppb)

Health Based Limits for Copper

California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.300 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. 1000 ppb
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.1300 ppb
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.1300 ppb

Violation Summary for Copper in Montana

There are no violations reported for this contaminant in Montana