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National Drinking Water Database


Nitrate & nitrite in Delaware


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

The Most Polluted Communities in Delaware

126 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)
1Forest Park
Millsboro, DE
467 of 710.6 ppm
(9.6 to 11.2 ppm)
2Savannah Place Homeowners Assoc
Lewes, DE
813 of 310.53 ppm
(10.2 to 10.9 ppm)
3Briarwood Manor Mhp
Pittsford, DE
29613 of 139.22 ppm
(0.2 to 27.9 ppm)
4Country Club Village
Milford, DE
726 of 68.92 ppm
(8.1 to 9.6 ppm)
5Flying Dutchman Mobile Home Park 2
Felton, DE
305 of 58.66 ppm
(7.8 to 9.3 ppm)
6Seaford Water Department
Seaford, DE
6,69910 of 108.28 ppm
(7.1 to 11.93 ppm)
7Love Creek Park
Lewes, DE
2103 of 37.93 ppm
(7.7 to 8.2 ppm)
8Flying Dutchman Mobile Home Park 1
Felton, DE
304 of 57.78 ppm
(0 to 10.4 ppm)
9Sussex Manor Mobile Home Park
Laurel, DE
2794 of 47.78 ppm
(7.4 to 8.1 ppm)
10Homestead Park
Pittsville, DE
2304 of 47.71 ppm
(7.25 to 8.1 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 Delaware

There are no violations reported for this contaminant in Delaware