Know Your Environment. Protect Your Health.

Nitrate and nitrite

Zone 2 Water System Inc.

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.220 ppm62ND - 0.660 ppm
20190.160 ppm220.160 ppm
20200.130 ppm110.130 ppm
20210.500 ppm110.500 ppm
2022ND10ND
20230.1000 ppm110.1000 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
2018-05-03353901920010.660 ppm
2018-05-0335390192002ND
2018-05-0335390192003ND
2018-05-03353901920010.660 ppm
2018-05-0335390192002ND
2018-05-0335390192003ND
2019-12-13355197240010.160 ppm
2019-12-13355197240010.160 ppm
2020-12-11355992700010.130 ppm
2021-05-19B2102306-0040.500 ppm
2022-04-06B2201674-001ND
2023-03-14B2301077-0010.1000 ppm