Know Your Environment. Protect Your Health.

Nitrate and nitrite

Clark Public Utilities

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021ND30ND
20220.413 ppm134ND - 2.70 ppm
2023ND30ND

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
2021-06-294136311ND
2021-06-294136312ND
2021-08-024171314ND
2022-07-074329449ND
2022-07-074329451ND
2022-07-074329450ND
2022-07-284329442ND
2022-07-284329443ND
2022-08-0343294382.70 ppm
2022-08-0343294390.790 ppm
2022-08-0343293991.10 ppm
2022-08-044329455ND
2022-08-044329457ND
2022-08-044329459ND
2022-08-044329456ND
2022-08-1643641870.780 ppm
2023-04-064439683ND
2023-06-014474475ND
2023-09-194531977ND