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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Ashkum

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

 

103

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.00115 ppm403ND - 0.0190 ppm
20150.000255 ppm471ND - 0.0120 ppm
2016ND120ND
2017ND20ND
20180.0320 ppm21ND - 0.0640 ppm
2019N/A00N/A

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
2014-01-221401A43-001AND
2014-01-221401A43-002AND
2014-02-191402900-001AND
2014-02-191402900-002AND
2014-03-051403237-001AND
2014-03-051403237-002AND
2014-04-071404402-001AND
2014-04-071404402-002AND
2014-05-151405864-001AND
2014-05-151405864-001BND
2014-05-151405864-002AND
2014-05-151405864-002BND
2014-06-251406F02-001BND
2014-06-251406F02-001AND
2014-06-251406F02-002BND
2014-06-251406F02-002AND
2014-07-171407C38-001BND
2014-07-171407C38-001A0.0120 ppm
2014-07-171407C38-002AND
2014-07-171407C38-002BND
2014-08-131408811-001BND
2014-08-131408811-001AND
2014-08-131408811-002AND
2014-08-131408811-002BND
2014-09-221409C23-001A0.0190 ppm
2014-09-221409C23-001BND
2014-09-221409C23-002AND
2014-09-221409C23-002BND
2014-10-021410160-001BND
2014-10-021410160-001A0.0150 ppm
2014-10-021410160-002BND
2014-10-021410160-002AND
2014-11-041411212-001AND
2014-11-041411212-001BND
2014-11-041411212-002AND
2014-11-041411212-002BND
2014-12-151412885-001BND
2014-12-151412885-001AND
2014-12-151412885-002BND
2014-12-151412885-002AND
2015-01-201501B43-001AND
2015-01-201501B43-001BND
2015-01-201501B43-002BND
2015-01-201501B43-002AND
2015-02-181502B94-001AND
2015-02-181502B94-001BND
2015-02-181502B94-002BND
2015-02-181502B94-002AND
2015-03-111503868-001AND
2015-03-111503868-001BND
2015-03-111503868-002BND
2015-03-111503868-002AND
2015-04-281504M15-001AND
2015-04-281504M15-001BND
2015-04-281504M15-002BND
2015-04-281504M15-002AND
2015-05-061505557-001AND
2015-05-061505557-001BND
2015-05-061505557-002BND
2015-05-061505557-002AND
2015-06-171506G75-001BND
2015-06-171506G75-001AND
2015-06-171506G75-002AND
2015-06-171506G75-002BND
2015-07-231507N54-001AND
2015-07-231507N54-001BND
2015-07-231507N54-002AND
2015-07-231507N54-002BND
2015-08-201508I36-001BND
2015-08-201508I36-001AND
2015-08-201508I36-002AND
2015-08-201508I36-002BND
2015-09-101509944-001AND
2015-09-101509944-001BND
2015-09-101509944-002BND
2015-09-101509944-002AND
2015-10-221510J87-001AND
2015-10-221510J87-001BND
2015-10-221510J87-0020.0120 ppm
2015-11-191511F84-001BND
2015-11-191511F84-001AND
2015-11-191511F84-002BND
2015-11-191511F84-002AND
2015-12-091512817-001AND
2015-12-091512817-001BND
2015-12-091512817-002BND
2015-12-091512817-002AND
2016-01-211601C50-001AND
2016-01-211601C50-001BND
2016-01-211601C50-002BND
2016-01-211601C50-002AND
2016-02-111602854-001BND
2016-02-111602854-001AND
2016-02-111602854-002AND
2016-02-111602854-002BND
2016-03-171603C94-001BND
2016-03-171603C94-001AND
2016-03-171603C94-002BND
2016-03-171603C94-002AND
2017-07-101707544-001AND
2017-07-101707544-002AND
2018-09-051809343-001A0.0640 ppm
2018-09-051809343-002AND