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National Drinking Water Database

Nitrate & nitrite in Iowa

Nitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.

The Most Polluted Communities in Iowa

90 water utilities reported detecting Nitrate & nitrite in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Nitrate & nitrite level

RankSystem Population Served Positive test results of total reported tests Average Level
1Lost Nation Water Supply
Lost Natio, IA
4971 of 18.1 ppm
(8.1 ppm)
2Woodbine Water Department
Woodbine, IA
1,5641 of 17.6 ppm
(7.6 ppm)
3St Ansgar Water Supply
St. Ansgar, IA
1,0311 of 17.3 ppm
(7.3 ppm)
4College Springs Water Supply
College Sp, IA
2461 of 16.8 ppm
(6.8 ppm)
5Monmouth Water Supply
Baldwin, IA
1801 of 15.9 ppm
(5.9 ppm)
6Sidney Water Supply
Sidney, IA
1,3001 of 15.9 ppm
(5.9 ppm)
7Early Municipal Water Supply
Early, IA
6751 of 15.8 ppm
(5.8 ppm)
8Correctionville Water Supply
Correction, IA
8511 of 15.5 ppm
(5.5 ppm)
9Kingsley Water Supply
Kingsley, IA
1,2451 of 15.2 ppm
(5.2 ppm)
10Mapleton Municipal Water Plant
Mapleton, IA
1,3222 of 25.2 ppm
(4.7 to 5.7 ppm)

Health Based Limits for Nitrate & nitrite

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.10 ppm
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.10 ppm
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.10 ppm

Violation Summary for Nitrate & nitrite in Iowa

There are no violations reported for this contaminant in Iowa