Know Your Environment. Protect Your Health.

Nitrate and nitrite

Miramiguoa Park

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.610 ppm110.610 ppm
20190.620 ppm110.620 ppm
20200.783 ppm110.783 ppm
20210.546 ppm110.546 ppm
20220.624 ppm110.624 ppm
20230.0520 ppm110.0520 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
2018-11-27AD348810.610 ppm
2019-11-13AD571870.620 ppm
2020-10-1920171420.783 ppm
2021-12-0621187450.546 ppm
2022-11-2122202720.624 ppm
2023-10-3023173830.0520 ppm