Know Your Environment. Protect Your Health.

Nitrate

Rra Preston Shores Water System

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
20180.110 ppm110.110 ppm
20190.502 ppm110.502 ppm
20200.308 ppm110.308 ppm
20210.164 ppm110.164 ppm
20220.143 ppm110.143 ppm
20230.204 ppm110.204 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
2018-06-19Q18243750050.110 ppm
2019-02-25Q19079580010.502 ppm
2020-03-02Q20077630010.308 ppm
2021-05-19Q21131450040.164 ppm
2022-03-02Q22072090050.143 ppm
2023-02-22Q23074650010.204 ppm