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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Tbw/s. Pasco Wellfield Chemical Feed System

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.

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.00500 ppm82ND - 0.0200 ppm
20150.0163 ppm84ND - 0.0500 ppm
20160.00250 ppm81ND - 0.0200 ppm
2017ND50ND
2018ND80ND
2019ND80ND

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
2014-01-06ND
2014-01-08ND
2014-04-09ND
2014-06-030.0200 ppm
2014-07-080.0200 ppm
2014-07-09ND
2014-10-08ND
2014-10-29ND
2015-01-130.0500 ppm
2015-01-14ND
2015-04-010.0200 ppm
2015-04-07ND
2015-07-14ND
2015-07-140.0500 ppm
2015-10-13ND
2015-10-140.01000 ppm
2016-01-05ND
2016-02-03ND
2016-04-06ND
2016-05-10ND
2016-07-05ND
2016-07-12ND
2016-10-120.0200 ppm
2016-11-15ND
2017-01-04ND
2017-01-11ND
2017-04-05ND
2017-04-18ND
2017-11-07ND
2018-01-09ND
2018-01-10ND
2018-04-04ND
2018-04-09ND
2018-07-11ND
2018-07-11ND
2018-10-11ND
2018-10-17ND
2019-01-10ND
2019-01-24ND
2019-04-02ND
2019-04-03ND
2019-07-08ND
2019-07-08ND
2019-10-01ND
2019-11-19ND