The Power of Information

National Drinking Water Database


Nitrite in New Hampshire


Nitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.

The Most Polluted Communities in New Hampshire

37 water utilities reported detecting Nitrite in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Nitrite level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Henry W Moore School
NH
54421 of 210.6 ppm
(0.39 to 0.85 ppm)
2Cornish Elementary School
NH
1901 of 20.15 ppm
(0 to 0.29 ppm)
3Ellis School
NH
5346 of 60.09 ppm
(0.05 to 0.13 ppm)
4Hinsdale Water Dept /Downtown
Hinsdale, NH
1,0801 of 40.07 ppm
(0 to 0.29 ppm)
5Harbor Square Shopping Center
NH
436 of 60.06 ppm
(0.05 to 0.07 ppm)
6Chandler Mtn Pure Aquifer
NH
01 of 20.06 ppm
(0 to 0.11 ppm)
7Laura S Barnes Plains School
NH
2006 of 150.04 ppm
(0 to 0.25 ppm)
8North Hinsdale Water Dept
Hinsdale, NH
1,2501 of 50.04 ppm
(0 to 0.18 ppm)
9South Weare Water
Weare, NH
2001 of 50.03 ppm
(0 to 0.16 ppm)
10Bainbridge Park
NH
502 of 50.03 ppm
(0 to 0.13 ppm)

Health Based Limits for 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.1 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.1 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.1 ppm
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1 ppm
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1 ppm

Violation Summary for Nitrite in New Hampshire

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

Violation TypeNumber of Violations
Failure to monitor regularly17