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National Drinking Water Database

Nitrate & nitrite in Connecticut

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

The Most Polluted Communities in Connecticut

526 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
1Neipsic Woods Water Association
Glastonbury, CT
9216 of 167.95 ppm
(6 to 10 ppm)
2Brooklyn Manor
Danielson, CT
3016 of 167.52 ppm
(4.3 to 8.2 ppm)
3Gorman Road Apartments - Buildings 1 & 2
253 of 37.07 ppm
(4.9 to 8.2 ppm)
4Rogers Mobile Home Park
Groton, CT
5716 of 167.03 ppm
(6.6 to 7.9 ppm)
5Tyler Lake Water Co-Indian Springs
Watertown, CT
36414 of 146.57 ppm
(6.1 to 7.52 ppm)
6School Hill Association, Inc.
Broad Brook, CT
774 of 46.45 ppm
(4.3 to 7.9 ppm)
7Candlewood Shores Tax District
Brookfield, CT
1,31523 of 235.83 ppm
(4.4 to 7.7 ppm)
8Ledgewood Condominium Assn-Douglas Drive
Southbury, CT
5016 of 165.76 ppm
(3.1 to 8.7 ppm)
9Farmington Line West Condominiums
Bristol, CT
5115 of 155.65 ppm
(2 to 8.47 ppm)
10Hazardville Water Company
Enfield, CT
17,74425 of 255.56 ppm
(1.12 to 9.25 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 Connecticut

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

Violation TypeNumber of Violations
Failure to monitor regularly6