Know Your Environment. Protect Your Health.

Nitrate and nitrite

East Hampton WPCA - Village Center

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

9

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.200 ppm220.200 ppm
2019ND10ND
20200.770 ppm110.770 ppm
20210.620 ppm220.550 ppm - 0.690 ppm
20220.780 ppm220.780 ppm
20230.690 ppm110.690 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

ppm = parts per million

All test results

Date Lab ID Result
2018-03-13116547GE0.200 ppm
2018-03-13116548GE0.200 ppm
2019-07-08125867ND
2020-03-241311930.770 ppm
2021-03-231386530.690 ppm
2021-05-111396910.550 ppm
2022-11-301534770.780 ppm
2022-11-301534780.780 ppm
2023-09-281635990.690 ppm