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National Drinking Water Database

Copper in Washington

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 Washington

1,571 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
1Town of Rockford
Rockford, WA
4812 of 21900.34 ppb
(50.68 to 3750 ppb)
2Snow Creek
Port Hadlock, WA
401 of 11780 ppb
(1780 ppb)
3Grand Mound
Olympia, WA
3641 of 11770.3 ppb
(1770.3 ppb)
4Lummi Point Water Association
Lummi Island, WA
451 of 11708 ppb
(1708 ppb)
5Bonnie View Water
Oak Harbor, WA
443 of 31691.67 ppb
(920 to 2080 ppb)
6Skymeadows Community Association
Oak Harbor, WA
511 of 11654 ppb
(1654 ppb)
7Norcliffe Water Association
Oak Harbor, WA
571 of 21477.4 ppb
(0 to 2954.8 ppb)
8Bronson Beach Club
Tenino, WA
2204 of 41327.06 ppb
(45 to 3636.67 ppb)
9Meadow Wood Community
East Olympia, WA
433 of 41253.13 ppb
(0 to 2276 ppb)
10Green Island Hills Water Assn
Stanwood, WA
2652 of 21249 ppb
(1090 to 1408 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 Washington

There are no violations reported for this contaminant in Washington