Know Your Environment. Protect Your Health.

Nitrate and nitrite

Twilight WC

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)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.163 ppm110.163 ppm
20190.104 ppm440.0430 ppm - 0.185 ppm
20200.0540 ppm110.0540 ppm
20210.0840 ppm110.0840 ppm
20220.0825 ppm110.0825 ppm
20230.0783 ppm110.0783 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 Result
2018-12-110.163 ppm
2019-03-200.185 ppm
2019-06-240.114 ppm
2019-08-200.0730 ppm
2019-11-250.0430 ppm
2020-02-260.0540 ppm
2021-12-270.0840 ppm
2022-06-270.0825 ppm
2023-12-140.0783 ppm