Know Your Environment. Protect Your Health.

Nitrate and nitrite

East Pasadena Water Company

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)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.770 ppm220.700 ppm - 0.840 ppm
2019N/A00N/A
2020N/A00N/A
20210.670 ppm220.610 ppm - 0.730 ppm
20220.990 ppm220.780 ppm - 1.20 ppm
2023N/A00N/A

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
2018-03-19CA1910020_005_005-2018031909400.840 ppm
2018-03-19CA1910020_012_012-2018031908550.700 ppm
2021-03-08CA1910020_005_005-2021030809100.730 ppm
2021-03-08CA1910020_012_012-2021030808450.610 ppm
2022-10-18CA1910020_005_005-2022101811061.20 ppm
2022-10-18CA1910020_012_012-2022101809440.780 ppm