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National Drinking Water Database

Nitrate & nitrite in North Dakota

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

The Most Polluted Communities in North Dakota

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 Minto
Minto, ND
6575 of 56.44 ppm
(5.32 to 7.86 ppm)
2City of Ross
Ross, ND
488 of 85.24 ppm
(3.9 to 7.69 ppm)
3Forest River Colony
Fordville, ND
917 of 83.8 ppm
(0 to 11.8 ppm)
4City of Langdon
Langdon, ND
2,1018 of 82.66 ppm
(0.31 to 5.72 ppm)
5City of Pembina
Pembina, ND
6422 of 22.5 ppm
(2.45 to 2.54 ppm)
6City of Velva
Velva, ND
1,0498 of 92.4 ppm
(0 to 4.71 ppm)
7City of Grafton
Grafton, ND
4,5165 of 52.12 ppm
(1.3 to 2.84 ppm)
8Tri-County Water District
Petersburg, ND
2,5385 of 52.11 ppm
(1.56 to 2.6 ppm)
9City of Larimore
Larimore, ND
1,4335 of 52.06 ppm
(1.52 to 2.73 ppm)
10City of Drayton
Drayton, ND
9135 of 51.95 ppm
(0.86 to 3.05 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 North Dakota

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

Violation TypeNumber of Violations
Failure to monitor regularly1