EWG's Tap Water Database — 2019 UPDATE


Nitrate and nitrite

Golden State Water Company (GSWC) - Culver City

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.141 ppm51ND - 0.705 ppm
20130.493 ppm54ND - 1.09 ppm
20140.124 ppm51ND - 0.618 ppm
20150.379 ppm52ND - 0.948 ppm
20160.396 ppm52ND - 1.06 ppm
20170.382 ppm54ND - 0.622 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The 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