Know Your Environment. Protect Your Health.

Nitrate and nitrite

Mill River Water District

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.

 

3

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0900 ppm110.0900 ppm
20190.199 ppm220.0810 ppm - 0.317 ppm
2020ND10ND
20210.177 ppm21ND - 0.353 ppm
20220.110 ppm110.110 ppm
20230.0912 ppm220.0633 ppm - 0.119 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
2022-11-02AY19818-NIT0.110 ppm
2023-05-22AZ09224-NIT0.119 ppm
2023-10-17AZ19164-NIT0.0633 ppm