Know Your Environment. Protect Your Health.

Nitrate

South Grafton 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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.900 ppm32ND - 1.40 ppm
20190.567 ppm31ND - 1.70 ppm
20200.367 ppm31ND - 1.10 ppm
20211.30 ppm331.000 ppm - 1.70 ppm
20220.400 ppm31ND - 1.20 ppm
20230.900 ppm43ND - 1.20 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 Result
2018-04-021.30 ppm
2018-04-02ND
2018-04-021.40 ppm
2019-05-06ND
2019-05-06ND
2019-05-061.70 ppm
2020-05-04ND
2020-05-041.10 ppm
2020-05-04ND
2021-05-101.20 ppm
2021-05-101.000 ppm
2021-05-101.70 ppm
2022-05-021.20 ppm
2022-05-02ND
2022-05-02ND
2023-05-011.20 ppm
2023-05-011.20 ppm
2023-05-011.20 ppm
2023-05-01ND