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National Drinking Water Database

Nitrate & nitrite in Arkansas

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

The Most Polluted Communities in Arkansas

266 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
1Independence Jackson Regional
Bradford, AR
2,82524 of 244.02 ppm
(0.23 to 5.68 ppm)
2Newark Waterworks
Newrk, AR
1,5126 of 63.65 ppm
(3.47 to 4.09 ppm)
3Oxford Waterworks
Oxford, AR
1,01723 of 233.26 ppm
(0.4 to 12.8 ppm)
4Green Forest Waterworks
Green Forest, AR
4,7272 of 23.23 ppm
(3.23 ppm)
5Oil Trough Waterworks
Oil Trough, AR
28418 of 183.16 ppm
(0.67 to 5.26 ppm)
6Siloam Springs Waterworks
Siloam Springs, AR
14,67223 of 233.06 ppm
(0.3 to 9.19 ppm)
7Red Bud Mobile Home Park
427 of 72.99 ppm
(1.19 to 4.6 ppm)
8Rock Moore Water Authority
Sulphur Rock, AR
3,9996 of 62.73 ppm
(2.32 to 3.14 ppm)
9Cross County Rural Water Sys
Hickory Ridge, AR
12,07520 of 232.47 ppm
(0 to 3.99 ppm)
10Colt Water Association
Colt, AR
1,15810 of 102.26 ppm
(0.33 to 4.16 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 Arkansas

There are no violations reported for this contaminant in Arkansas