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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Pennsylvania American Royersford

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
2014ND140ND
2015ND140ND
2016ND140ND
2017ND110ND
2018ND80ND
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
2014-01-0824411801ND
2014-01-0824411201ND
2014-01-0824411901ND
2014-04-0225341601ND
2014-04-0225341701ND
2014-04-0325341001ND
2014-04-0325341801ND
2014-06-2525339701ND
2014-07-0826115901ND
2014-07-0826116001ND
2014-07-0826115101ND
2014-10-0627104801ND
2014-10-0627103801ND
2014-10-0627104901ND
2015-01-0812283014ND
2015-01-0812283058ND
2015-01-0812283060ND
2015-04-0912628920ND
2015-04-0912628943ND
2015-04-0912628855ND
2015-04-0912628947ND
2015-04-0912628945ND
2015-07-1313008736ND
2015-07-1313008759ND
2015-09-1613260285ND
2015-10-0613385302ND
2015-10-0613385346ND
2015-10-0613385348ND
2016-01-1213749049ND
2016-01-1213749045ND
2016-01-1213749047ND
2016-04-0514097909ND
2016-04-0514097907ND
2016-04-0514097817ND
2016-04-0514097905ND
2016-04-0514097882ND
2016-07-1214564474ND
2016-07-1214564472ND
2016-07-1214564476ND
2016-10-0415070970ND
2016-10-0415070972ND
2016-10-0415070968ND
2017-01-1015512515ND
2017-01-1015512519ND
2017-01-1015512517ND
2017-04-1115931676ND
2017-04-1115931673ND
2017-04-1115931536ND
2017-04-1115931650ND
2017-07-1216408225ND
2017-07-1216408223ND
2017-10-1016875622ND
2017-12-0717157395ND
2018-01-0938161801ND
2018-01-0938162801ND
2018-01-0938162701ND
2018-04-1139073601ND
2018-04-1139074401ND
2018-04-1139073101ND
2018-07-1040207901ND
2018-10-0841311801ND
2019-01-0842501001ND
2019-01-0842500101ND
2019-04-1644166401ND
2019-04-1644166301ND
2019-04-1644166201ND
2019-04-2342501101ND
2019-07-0845018801ND
2019-09-0546200301ND
2019-09-0546200401ND
2019-10-1046832501ND
2019-11-0547365301ND