The Power of Information

National Drinking Water Database


Manganese in Washington


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

The Most Polluted Communities in Washington

595 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)
1Stevens Co Pud - Chatteroy Springs North
Chattaroy, WA
373 of 31645.56 ppb
(16.67 to 2900 ppb)
2Olympic Circle
Olalla, WA
401 of 11150 ppb
(1150 ppb)
3Woodglen Prd Water System
Oak Harbor, WA
401 of 1920 ppb
(920 ppb)
4Hunters Water District
Hunters, WA
1601 of 1690 ppb
(690 ppb)
5Norcliffe Water Association
Oak Harbor, WA
571 of 1660 ppb
(660 ppb)
6Inchelium Water District
Inchelium, WA
3464 of 4624.5 ppb
(508 to 720 ppb)
7Summerland
Oak Harbor, WA
851 of 1581 ppb
(581 ppb)
8Cherry Creek Water System
Seattle, WA
1041 of 1580 ppb
(580 ppb)
9Kamilche Shores
Shelton, WA
311 of 1555 ppb
(555 ppb)
10West Beach Road Association
Oak Harbor, WA
401 of 1520 ppb
(520 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 Washington

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Washington since 2004

Violation TypeNumber of Violations
Failure to monitor regularly226