Know Your Environment. Protect Your Health.

Nitrate

Manchester Water District

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

37

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.828 ppm85ND - 2.03 ppm
20190.684 ppm84ND - 2.18 ppm
2020N/A00N/A
20210.806 ppm84ND - 2.33 ppm
20220.693 ppm73ND - 2.32 ppm
20230.364 ppm62ND - 1.67 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL): 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-04-300.420 ppm
2018-07-031.84 ppm
2018-07-03ND
2018-07-032.03 ppm
2018-07-03ND
2018-07-03ND
2018-09-140.500 ppm
2018-09-241.83 ppm
2019-04-01ND
2019-05-081.66 ppm
2019-07-151.09 ppm
2019-07-15ND
2019-07-24ND
2019-08-26ND
2019-09-062.18 ppm
2019-09-060.540 ppm
2021-04-054096341ND
2021-07-084144718ND
2021-07-1341446541.72 ppm
2021-07-134144653ND
2021-07-1341372401.83 ppm
2021-08-234167187ND
2021-09-0841722150.570 ppm
2021-09-0841722392.33 ppm
2022-04-054262899ND
2022-07-204314461ND
2022-07-204314463ND
2022-07-2043144621.94 ppm
2022-08-044379122ND
2022-09-1643479290.590 ppm
2022-09-1643479282.32 ppm
2023-04-1844398150.514 ppm
2023-04-184439814ND
2023-07-054489150ND
2023-07-054489151ND
2023-07-054489149ND
2023-07-0544891481.67 ppm