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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Regional Water Authority

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

MORE ABOUT THIS CONTAMINANT

 

65

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015ND110ND
20160.0762 ppm112ND - 0.448 ppm
20170.00182 ppm111ND - 0.0200 ppm
2018ND110ND
2019ND110ND

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

Date Lab ID Result
2014-02-25NOX 200391600ND
2014-02-25NOX 200391599ND
2014-02-25NOX 200391653ND
2014-02-25NOX 200391620ND
2014-02-25NOX 200391619ND
2014-02-25NOX 200391618ND
2014-02-25NOX 200391617ND
2014-02-25NOX 200391616ND
2014-05-13NOX 200395855ND
2014-05-13NOX 200395860ND
2015-01-08NOX 200410433ND
2015-02-10NOX 200411859ND
2015-02-10NOX 200411862ND
2015-02-10NOX 200411860ND
2015-02-10NOX 200411845ND
2015-02-10NOX 200411846ND
2015-02-10NOX 200411863ND
2015-02-10NOX 200411876ND
2015-03-18NOX 200413713ND
2015-05-05NOX 200416168ND
2015-05-05NOX 200416175ND
2016-02-09NOX 200433415ND
2016-02-09NOX 2004334250.390 ppm
2016-02-09NOX 200433398ND
2016-02-09NOX 200433397ND
2016-02-09NOX 200433479ND
2016-02-09NOX 200433413ND
2016-02-09NOX 200433412ND
2016-02-09NOX 200433414ND
2016-02-09NOX 200433411ND
2016-05-12NOX 200439513ND
2016-05-12NOX 2004395150.448 ppm
2017-03-21NOX 200462739ND
2017-03-21NOX 200462777ND
2017-03-21NOX 200462743ND
2017-03-21NOX 200462757ND
2017-03-21NOX 200462756ND
2017-03-21NOX 200462741ND
2017-03-21NOX 200462740ND
2017-03-21NOX 2004627420.0200 ppm
2017-03-21NOX 200462793ND
2017-06-20NOX 200469812ND
2017-06-20NOX 200469827ND
2018-03-14NOX 200489867ND
2018-03-14NOX 200489870ND
2018-03-14NOX 200489868ND
2018-03-14NOX 200489884ND
2018-03-14NOX 200489885ND
2018-03-14NOX 200489871ND
2018-03-14NOX 200489913ND
2018-03-14NOX 200489914ND
2018-03-15NOX 200490061ND
2018-11-29NOX 200514097ND
2018-11-29NOX 200514112ND
2019-03-18NOX 200524895ND
2019-03-19NOX 200525057ND
2019-03-19NOX 200525060ND
2019-03-19NOX 200525058ND
2019-03-19NOX 200525059ND
2019-03-19NOX 200525077ND
2019-03-19NOX 200525078ND
2019-03-19NOX 200525061ND
2019-03-19NOX 200525097ND
2019-03-19NOX 200525098ND
2019-05-08NOX 200531297ND