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National Drinking Water Database

Nitrate & nitrite in Wyoming

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

The Most Polluted Communities in Wyoming

137 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
1North End Water Users
Powell, WY
4899 of 97.65 ppm
(6.3 to 10.3 ppm)
2Torrington Mun. Water System
Torrington, WY
5,600262 of 2626.48 ppm
(4.3 to 11.1 ppm)
3Hide-A-Way Mobile Home Park
Cheyenne, WY
695 of 56.37 ppm
(5.05 to 7.6 ppm)
4Stone Creek
Torrington, WY
406 of 66.2 ppm
(5.4 to 6.7 ppm)
5Town of Burlington
Burlington, WY
2506 of 65.05 ppm
(3.76 to 9.19 ppm)
6Burns Bd. of Public Utilities
Burns, WY
2546 of 65.02 ppm
(3.35 to 6.37 ppm)
7J-W Subdivision Association
Jackson, WY
385 of 54.56 ppm
(3.9 to 5.4 ppm)
8Valley View Mutual Water Company
Teton Village, WY
1004 of 44.25 ppm
(3.8 to 5 ppm)
9Town of Albin
Albin, WY
12811 of 114.24 ppm
(2.1 to 7.1 ppm)
10Winchester Hills
Cheyenne, WY
6005 of 54.16 ppm
(3.6 to 5.48 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 Wyoming

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

Violation TypeNumber of Violations
Failure to monitor regularly3