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National Drinking Water Database

Selenium (total) in Iowa

Selenium is a naturally occurring element that contaminates water due to mining or petrolum refining, fly-ash from coal-burning power plants, and irrigation of arid farmland soils high in selenium. [read more]

The Most Polluted Communities in Iowa

24 water utilities reported detecting Selenium (total) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Selenium (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
1Remsen Municipal Utilities
Remsen, IA
1,76218 of 1831.11 ppb
(20 to 50 ppb)
2Kingsley Water Supply
Kingsley, IA
1,2451 of 130 ppb
(30 ppb)
3Linn Grove Water Works
Linn Grove, IA
2111 of 130 ppb
(30 ppb)
4Woodbine Water Department
Woodbine, IA
1,5641 of 122 ppb
(22 ppb)
5Oto Water Supply
Oto, IA
1451 of 120 ppb
(20 ppb)
6Harlan Municipal Utilities
Harlan, IA
5,3131 of 120 ppb
(20 ppb)
7Sunnyside Village Mobile Park
Omaha, IA
2041 of 120 ppb
(20 ppb)
8Dow City Water Works
Dow City, IA
5031 of 120 ppb
(20 ppb)
9Moorhead Water Supply
Moorhead, IA
2321 of 111 ppb
(11 ppb)
10Hawarden Water Supply
Hawarden, IA
2,4781 of 110 ppb
(10 ppb)

Health Based Limits for Selenium (total)

Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.50 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.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.50 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.170 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.200 ppb

Violation Summary for Selenium (total) in Iowa

There are no violations reported for this contaminant in Iowa