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EWG's Tap Water Database — 2019 UPDATE

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Nitrite

Pennsylvania American Water Pittsburgh

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.

 

72

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0286 ppm142ND - 0.300 ppm
2013ND20ND
20140.00714 ppm141ND - 0.1000 ppm
20150.0214 ppm142ND - 0.200 ppm
20160.0571 ppm144ND - 0.300 ppm
20170.0214 ppm142ND - 0.200 ppm

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
2012-08-0717894601ND
2012-08-1418204701ND
2012-09-1117895201ND
2012-09-11178948010.1000 ppm
2012-09-11178938010.300 ppm
2012-09-1117893401ND
2012-09-1117894101ND
2012-09-1117895601ND
2012-11-0719887301ND
2012-11-0719887201ND
2012-11-0719886301ND
2012-11-0719886401ND
2012-11-0719887601ND
2012-11-0719886501ND
2013-08-0623083601ND
2013-08-2623084901ND
2014-07-1626125301ND
2014-07-1626126601ND
2014-07-1626125101ND
2014-07-1626124901ND
2014-07-1626126501ND
2014-07-1626126301ND
2014-08-0626528101ND
2014-08-2027022401ND
2014-10-0727111801ND
2014-10-0727112401ND
2014-10-0727111401ND
2014-10-0727112501ND
2014-10-0727111501ND
2014-10-22275929010.1000 ppm
2015-07-0713075037ND
2015-07-0713075029ND
2015-07-0713075039ND
2015-07-0713075033ND
2015-07-0713075035ND
2015-07-0713075031ND
2015-08-0513198212ND
2015-08-1013198175ND
2015-10-1413450750ND
2015-10-1413450754ND
2015-10-14134507480.200 ppm
2015-10-1413450756ND
2015-10-1413450746ND
2015-10-14134507520.1000 ppm
2016-07-2014653080ND
2016-07-2014653078ND
2016-07-20146530740.200 ppm
2016-07-2014653076ND
2016-07-2014653082ND
2016-07-2014653072ND
2016-08-0214821652ND
2016-08-0314821650ND
2016-10-18151529300.1000 ppm
2016-10-1815152938ND
2016-10-1815152940ND
2016-10-18151529360.300 ppm
2016-10-1815152934ND
2016-10-18151529320.200 ppm
2017-07-2016489783ND
2017-07-2016489818ND
2017-07-2016489816ND
2017-07-20164897850.1000 ppm
2017-07-2016489787ND
2017-07-2016489820ND
2017-08-0216646189ND
2017-08-0816646186ND
2017-10-1716953568ND
2017-10-17169535720.200 ppm
2017-10-1716953570ND
2017-10-1716953566ND
2017-10-1716953574ND
2017-10-1716953576ND