Know Your Environment. Protect Your Health.

Nitrate and nitrite

Portland Water District/steep Falls

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.

 

4

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
20200.980 ppm110.980 ppm
20210.920 ppm110.920 ppm
20221.07 ppm111.07 ppm
20230.920 ppm110.920 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
2020-06-162006-02268-0010.980 ppm
2021-06-232106-03856-0010.920 ppm
2022-06-212206-03384-0011.07 ppm
2023-06-292306-06203-0010.920 ppm