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National Drinking Water Database

Nitrate & nitrite in Idaho

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

The Most Polluted Communities in Idaho

176 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
1City of Fruitland
Fruitland, ID
4,1161 of 114.6 ppm
(14.6 ppm)
2Whitewater Subd
Pocatello, ID
1001 of 113.2 ppm
(13.2 ppm)
3Country Club Subdivisions Water Assn
Caldwell, ID
831 of 111.8 ppm
(11.8 ppm)
4Country Club
Caldwell, ID
551 of 111.6 ppm
(11.6 ppm)
5City of Weston
Weston, ID
4254 of 410.85 ppm
(5.7 to 16.3 ppm)
6City of Hollister
Hollister, ID
1801 of 19.93 ppm
(9.93 ppm)
Boise, ID
251 of 18.82 ppm
(8.82 ppm)
8Eaton Mobile Home Court
Lewiston, ID
944 of 47.75 ppm
(5.5 to 12.4 ppm)
9Riverside Trailer Court
Twin Falls, ID
351 of 16.92 ppm
(6.92 ppm)
10Maverick Subd Lasher Construction
Caldwell, ID
901 of 16.7 ppm
(6.7 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 Idaho

There are no violations reported for this contaminant in Idaho