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EWG's Tap Water Database — 2019 UPDATE

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Nitrite

Northwest Utilities

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
2014ND30ND
20150.0127 ppm31ND - 0.0380 ppm
2016ND30ND
20170.0207 ppm31ND - 0.0620 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 Result
2012-08-21ND
2012-09-04ND
2012-09-04ND
2013-08-06ND
2013-08-06ND
2013-08-13ND
2014-07-21ND
2014-07-21ND
2014-07-21ND
2015-09-15ND
2015-09-15ND
2015-09-150.0380 ppm
2016-09-12ND
2016-09-12ND
2016-09-12ND
2017-08-23ND
2017-08-23ND
2017-08-230.0620 ppm