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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Woodward Resource Center

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

 

142

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND240ND
2015ND240ND
2016ND240ND
2017ND240ND
2018ND240ND
2019ND220ND

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
2014-01-152026516ND
2014-01-152026517ND
2014-02-192034495ND
2014-02-192034496ND
2014-03-192039106ND
2014-03-192039116ND
2014-04-232045993ND
2014-04-232045994ND
2014-05-212050778ND
2014-05-212050784ND
2014-06-182055903ND
2014-06-182055925ND
2014-07-172062192ND
2014-07-172062193ND
2014-08-202071570ND
2014-08-202071572ND
2014-09-252079053ND
2014-09-252079086ND
2014-10-222085413ND
2014-10-222085415ND
2014-11-202091873ND
2014-11-202091874ND
2014-12-172096506ND
2014-12-172096512ND
2015-01-14OE209912ND
2015-01-14OE209911ND
2015-02-18OE214704ND
2015-02-18OE214706ND
2015-03-18OE222044ND
2015-03-18OE222045ND
2015-04-22OE234216ND
2015-04-24OE235276ND
2015-05-20OE245131ND
2015-05-20OE245130ND
2015-06-10OE253177ND
2015-06-10OE253178ND
2015-07-22OE270279ND
2015-07-22OE270278ND
2015-08-13OE279946ND
2015-08-13OE279947ND
2015-09-23OE297060ND
2015-09-24OE297468ND
2015-10-20OE307958ND
2015-10-20OE307959ND
2015-11-12OE316926ND
2015-11-12OE316925ND
2015-12-17OE328065ND
2015-12-17OE328064ND
2016-01-20OE336943ND
2016-01-20OE336945ND
2016-02-17OE345960ND
2016-02-17OE345959ND
2016-03-23OE357891ND
2016-03-23OE357892ND
2016-04-20OE368521ND
2016-04-20OE368523ND
2016-05-18OE379120ND
2016-05-18OE379121ND
2016-06-22OE392404ND
2016-06-22OE392403ND
2016-07-20OE403916ND
2016-07-20OE403914ND
2016-08-18OE417047ND
2016-08-18OE417045ND
2016-09-22OE431961ND
2016-09-22OE431962ND
2016-10-19OE442585ND
2016-10-19OE442584ND
2016-11-16OE452911ND
2016-11-16OE452912ND
2016-12-20OE463615ND
2016-12-20OE463614ND
2017-01-19OE471998ND
2017-01-19OE471999ND
2017-02-21OE482849ND
2017-02-21OE482850ND
2017-03-16OE491380ND
2017-03-16OE491381ND
2017-04-26OE506114ND
2017-04-26OE506113ND
2017-05-25OE517403ND
2017-05-25OE517402ND
2017-06-15OE525049ND
2017-06-15OE525050ND
2017-07-20OE540358ND
2017-07-20OE540359ND
2017-08-16OE552603ND
2017-08-16OE552601ND
2017-09-20OE567486ND
2017-09-20OE567487ND
2017-10-18OE579474ND
2017-10-18OE579475ND
2017-11-15OE590571ND
2017-11-15OE590572ND
2017-12-20OE603109ND
2017-12-20OE603110ND
2018-01-18OE612265ND
2018-01-18OE612266ND
2018-02-21OE625194ND
2018-02-21OE625195ND
2018-03-21OE635801ND
2018-03-21OE635803ND
2018-04-19OE647184ND
2018-04-19OE647185ND
2018-05-23OE661405ND
2018-05-23OE661406ND
2018-06-19OE672196ND
2018-06-19OE672197ND
2018-07-17OE684464ND
2018-07-17OE684465ND
2018-08-09OE696308ND
2018-08-09OE696309ND
2018-09-19OE715370ND
2018-09-19OE715371ND
2018-10-17OE728258ND
2018-10-17OE728259ND
2018-11-27OE743626ND
2018-11-27OE743627ND
2018-12-19OE752131ND
2018-12-19OE752132ND
2019-01-16OE760999ND
2019-01-16OE761000ND
2019-02-21OE773513ND
2019-02-21OE773514ND
2019-03-27OE786006ND
2019-03-27OE786007ND
2019-04-24OE798809ND
2019-04-24OE798810ND
2019-05-22OE811333ND
2019-05-22OE811334ND
2019-06-26OE826157ND
2019-06-26OE826158ND
2019-07-25OE840151ND
2019-07-25OE840152ND
2019-08-22OE854725ND
2019-08-22OE854726ND
2019-09-23OE869174ND
2019-09-23OE869175ND
2019-10-23OE883850ND
2019-10-23OE883851ND
2019-11-14OE893606ND
2019-11-14OE893607ND