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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

North Wales 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

 

225

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND360ND
2015ND390ND
2016ND370ND
2017ND380ND
2018ND380ND
2019ND370ND

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
2014-02-0620140386ND
2014-02-1720140574ND
2014-02-1720140575ND
2014-02-1820140591ND
2014-03-0420140737ND
2014-03-1720140913ND
2014-04-1420141265ND
2014-05-0520141506ND
2014-05-0520141507ND
2014-05-0520141508ND
2014-05-0520141509ND
2014-05-0520141510ND
2014-05-0520141511ND
2014-05-0520141512ND
2014-05-0520141513ND
2014-05-0520141514ND
2014-05-0520141452ND
2014-05-2020141721ND
2014-06-1014060921-001ND
2014-06-1714061674-001ND
2014-07-0820142275ND
2014-07-2220142483ND
2014-07-2820142548ND
2014-07-2820142549ND
2014-08-0520142632ND
2014-08-1920142845ND
2014-09-0220142982ND
2014-09-2320143183ND
2014-10-0720143357ND
2014-10-2020143544ND
2014-10-2020143545ND
2014-10-2120143566ND
2014-11-0420143702ND
2014-11-1720143904ND
2014-12-0220144057ND
2014-12-1620144276ND
2015-01-0612288422ND
2015-01-1912288425ND
2015-02-0312403022ND
2015-02-0912403017ND
2015-02-0912403019ND
2015-02-1712403025ND
2015-03-1012516656ND
2015-03-2312516659ND
2015-04-0712634378ND
2015-04-2212634381ND
2015-05-0412634687ND
2015-05-0412634690ND
2015-05-0412634693ND
2015-05-0412634696ND
2015-05-0412634699ND
2015-05-0412634702ND
2015-05-0412634705ND
2015-05-0412634708ND
2015-05-0412634711ND
2015-05-0412634714ND
2015-05-2012750895ND
2015-06-0212751211ND
2015-06-1512883686ND
2015-07-0713014092ND
2015-07-2013014401ND
2015-07-2013014404ND
2015-07-2013014398ND
2015-08-0413136887ND
2015-08-1713136930ND
2015-09-0113137222ND
2015-09-1413265878ND
2015-10-0613390437ND
2015-10-0713390440ND
2015-10-0713390443ND
2015-10-2013390447ND
2015-11-0313390484ND
2015-11-1613515329ND
2015-12-0113515334ND
2015-12-1413634640ND
2016-01-0513634732ND
2016-01-1813754088ND
2016-02-0113754092ND
2016-02-0113754094ND
2016-02-0213754410ND
2016-02-1613871457ND
2016-03-0713871774ND
2016-03-2113987514ND
2016-04-0513987803ND
2016-04-1914104378ND
2016-05-0214104469ND
2016-05-0214104471ND
2016-05-0214104473ND
2016-05-0214104475ND
2016-05-0214104477ND
2016-05-0214104479ND
2016-05-0214104481ND
2016-05-0214104483ND
2016-05-1614252328ND
2016-05-1714252330ND
2016-06-0714407008ND
2016-07-0514571703ND
2016-07-1914571705ND
2016-08-0114572077ND
2016-08-0114572079ND
2016-08-0214572081ND
2016-08-1614737305ND
2016-09-0614909757ND
2016-09-2014909755ND
2016-10-0314910180ND
2016-10-0314910182ND
2016-10-0414910184ND
2016-10-1815077234ND
2016-11-0115077606ND
2016-11-1515227766ND
2016-12-0615373638ND
2016-12-2015374068ND
2017-01-1015518966ND
2017-01-2415518968ND
2017-01-3015519055ND
2017-01-3015519057ND
2017-02-0715657238ND
2017-02-2115657240ND
2017-03-2815797414ND
2017-04-0415797852ND
2017-04-1815939265ND
2017-04-2415939247ND
2017-04-2415939249ND
2017-04-2415939251ND
2017-04-2415939253ND
2017-04-2415939255ND
2017-04-2415939257ND
2017-04-2415939259ND
2017-04-2415939261ND
2017-04-2415939263ND
2017-05-0215939465ND
2017-05-1616096515ND
2017-06-0616096974ND
2017-06-2716258962ND
2017-07-0616415501ND
2017-07-2516415630ND
2017-07-3116415649ND
2017-07-3116415651ND
2017-08-0116415653ND
2017-08-1516568066ND
2017-09-0516728638ND
2017-09-1916728645ND
2017-10-0316729094ND
2017-10-1616881905ND
2017-10-1616881907ND
2017-10-1716881909ND
2017-11-0716882353ND
2017-11-1417025020ND
2017-12-0517025455ND
2017-12-1917163807ND
2018-01-0920180087ND
2018-01-2220180305ND
2018-01-2220180306ND
2018-01-2320180321ND
2018-02-0620180480ND
2018-02-2020180664ND
2018-03-1320180944ND
2018-03-2620181103ND
2018-04-0320181257ND
2018-04-1720181468ND
2018-04-2320181626ND
2018-04-2320181627ND
2018-04-2320181629ND
2018-04-2320181630ND
2018-04-2320181631ND
2018-04-2320181632ND
2018-04-2320181633ND
2018-04-2320181634ND
2018-05-0120181676ND
2018-05-038052006-01ND
2018-05-1520181913ND
2018-06-0520182136ND
2018-07-1020182600ND
2018-07-2320182799ND
2018-07-2320182800ND
2018-07-2420182817ND
2018-08-0720182985ND
2018-08-2120183235ND
2018-09-0420183361ND
2018-09-1820183554ND
2018-10-0120183716ND
2018-10-0120183717ND
2018-10-0220183739ND
2018-10-1620183956ND
2018-11-0720184204ND
2018-11-1920184385ND
2018-12-0420184561ND
2018-12-1820184767ND
2019-01-0820190073ND
2019-01-2120190227ND
2019-01-2120190228ND
2019-01-2220190231ND
2019-02-0520190433ND
2019-02-2120190687ND
2019-03-1920191041ND
2019-04-0220191220ND
2019-04-1620191451ND
2019-04-2220191534ND
2019-04-2220191535ND
2019-04-2220191536ND
2019-04-2220191537ND
2019-04-2220191538ND
2019-04-2220191539ND
2019-04-2220191540ND
2019-04-2220191541ND
2019-04-2220191542ND
2019-05-079052358-01ND
2019-05-219054390-01ND
2019-06-049061931-01ND
2019-06-189064070-01ND
2019-07-099073410-01ND
2019-07-239075912-01ND
2019-07-2920192893ND
2019-08-069083171-01ND
2019-08-1920193259ND
2019-09-0320193432ND
2019-09-179093731-01ND
2019-10-019101721-01ND
2019-10-159103854-01ND
2019-11-0520194303ND
2019-11-1920194626ND
2019-11-1920194627ND
2019-11-1920194572ND
2019-12-0320194737ND
2019-12-1720194937ND