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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Cecilia Water Corporation

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.

MORE ABOUT THIS CONTAMINANT

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND20ND
2015ND20ND
20160.0102 ppm102ND - 0.0510 ppm
20170.0340 ppm220.0340 ppm
2018ND40ND
2019ND80ND

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
2014-08-04AD94787ND
2014-08-04AD94787ND
2015-11-0635216072022ND
2015-11-0635216072022ND
2016-02-12352297700150.0510 ppm
2016-02-12352297700150.0510 ppm
2016-04-1835240507004ND
2016-04-1835240507001ND
2016-04-1835240507002ND
2016-04-1835240507003ND
2016-04-1835240507004ND
2016-04-1835240507003ND
2016-04-1835240507002ND
2016-04-1835240507001ND
2017-05-01353101630070.0340 ppm
2017-05-01353101630070.0340 ppm
2018-02-01AE20658ND
2018-02-01AE20656ND
2018-02-01AE20656ND
2018-02-01AE20658ND
2019-02-1835449823001ND
2019-02-18B1900699-003ND
2019-02-18B1900699-002ND
2019-02-18B1900699-001ND
2019-02-1835449823001ND
2019-02-18B1900699-003ND
2019-02-18B1900699-002ND
2019-02-18B1900699-001ND