Know Your Environment. Protect Your Health.

Nitrate

Grand Harbor Water Supply Corporation

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.835 ppm110.835 ppm
20190.317 ppm110.317 ppm
20200.475 ppm110.475 ppm
20210.181 ppm110.181 ppm
20220.180 ppm110.180 ppm
20230.137 ppm110.137 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
2018-12-13Q18516800010.835 ppm
2019-10-30Q19746110010.317 ppm
2020-02-13Q20059380010.475 ppm
2021-03-18Q21071500010.181 ppm
2022-03-07Q22076570010.180 ppm
2023-03-21Q23106820020.137 ppm