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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Dtma Main System

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.

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81

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND150ND
2015ND140ND
2016ND140ND
2017ND130ND
2018ND140ND
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
2014-02-21ND
2014-04-16ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-08-12ND
2014-10-29ND
2015-02-2612391830ND
2015-05-1112740249ND
2015-08-1813126085ND
2015-08-1813126091ND
2015-08-1813126090ND
2015-08-1813126089ND
2015-08-1813126088ND
2015-08-1813126087ND
2015-08-1813126086ND
2015-08-1813126084ND
2015-08-1813126083ND
2015-08-1813126082ND
2015-08-1813126081ND
2015-10-2013380037ND
2016-02-1913861259ND
2016-04-0814091982ND
2016-07-1214556900ND
2016-07-1214556904ND
2016-07-1214556898ND
2016-07-1214556912ND
2016-07-1214556910ND
2016-07-1214556906ND
2016-07-1214556902ND
2016-07-1214556908ND
2016-07-1214556914ND
2016-07-1214556918ND
2016-07-1214556916ND
2016-10-2715065285ND
2017-02-1515645390ND
2017-05-0416083147ND
2017-09-2716715470ND
2017-09-2716715468ND
2017-09-2716715460ND
2017-09-2716715472ND
2017-09-2716715458ND
2017-09-2716715462ND
2017-09-2716715464ND
2017-09-2716715456ND
2017-09-2716715999ND
2017-09-2716715466ND
2017-10-2416869715ND
2018-02-21ND
2018-04-30ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-09-21ND
2018-11-20ND
2019-03-18ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND
2019-08-27ND