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National Drinking Water Database


Nitrite in Iowa


Nitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.

The Most Polluted Communities in Iowa

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

Ranked by highest average Nitrite level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Churdan Water Supply
Churdan, IA
4184 of 42.09 ppm
(1.45 to 2.75 ppm)
2Wellman Municipal Waterworks
Wellman, IA
1,39317 of 210.66 ppm
(0 to 2.3 ppm)
3Slater Muni Water Dept
Slater, IA
1,3067 of 70.47 ppm
(0.07 to 0.95 ppm)
4Alta Municipal Water Plant
Alta, IA
2,0051 of 10.4 ppm
(0.4 ppm)
5Linn Grove Water Works
Linn Grove, IA
2111 of 10.3 ppm
(0.3 ppm)
6Timber Ridge
Shellsburg, IA
22595 of 1210.28 ppm
(0 to 2.1 ppm)
7Schaller Water Supply
Storm Lake, IA
78453 of 750.27 ppm
(0 to 1 ppm)
8Williamsburg Public Water Supply
Williamsbu, IA
2,62226 of 380.23 ppm
(0 to 1.19 ppm)
9Palmer Water Supply
Palmer, IA
2141 of 10.2 ppm
(0.2 ppm)
10Smithland Water Supply
Smithland, IA
2311 of 10.2 ppm
(0.2 ppm)

Health Based Limits for Nitrite

StandardDescriptionLevel
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.1 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.1 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.1 ppm
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.1 ppm
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.1 ppm

Violation Summary for Nitrite in Iowa

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

Violation TypeNumber of Violations
Over maximum contaminant level, Single Sample20
Failure to monitor regularly12
Over maximum contaminant level, Average5
Failure to monitor: Check/Repeat/Confirmation sampling1