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National Drinking Water Database


Nitrate & nitrite in North Carolina


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

The Most Polluted Communities in North Carolina

332 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
(Range)
1Overhills Water Company
Spring Lake, NC
1,1001 of 18.79 ppm
(8.79 ppm)
2Parrish Meadows S/D
Raleigh, NC
659 of 97.18 ppm
(6.7 to 8.2 ppm)
3Braxton Hills/Simmons Heights
Fayetteville, NC
6988 of 86.61 ppm
(5.44 to 8 ppm)
4Hill Top S/D
Greensboro, NC
252 of 26.4 ppm
(5.9 to 6.89 ppm)
5Ashebrook Park
Gastonia, NC
2391 of 16.22 ppm
(6.22 ppm)
6Valley Woods Mhp
Knightdale, NC
2796 of 66.02 ppm
(4.6 to 7.2 ppm)
7Hunt`s Mhp
Raleigh, NC
1622 of 25.88 ppm
(5.3 to 6.45 ppm)
8Willow Creek S/D
Raleigh, NC
737 of 75.83 ppm
(5.2 to 6.4 ppm)
9Silverstone S/D
Gastonia, NC
791 of 15.6 ppm
(5.6 ppm)
10Brookwood S/D
Conover, NC
464 of 45.58 ppm
(2.45 to 9.4 ppm)

Health Based Limits for Nitrate & 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.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 Carolina

There are no violations reported for this contaminant in North Carolina