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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

California Water Service Company - Dominguez

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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014N/A00N/A
2015ND20ND
2016ND30ND
2017ND60ND

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
2015-03-259590-018-1355ND
2015-12-299590-016-1150ND
2016-03-239590-018-1340ND
2016-09-075810-004-1300ND
2016-12-289590-019-0930ND
2017-03-089590-019-1430ND
2017-08-235810-016-1212ND
2017-08-235810-019-1100ND
2017-10-119590-036-1335ND
2017-10-169590-805-1030ND
2017-12-265810-024-1315ND