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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Red Hill 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

 

35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015ND60ND
2016ND60ND
2017ND60ND
2018ND50ND
2019ND60ND

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
2014-03-05140009146ND
2014-03-05140009147ND
2014-03-05140009145ND
2014-05-14140020000ND
2014-07-23140032265ND
2014-11-05140050172ND
2015-02-1812402507ND
2015-02-1812402509ND
2015-02-1812402505ND
2015-06-2412883395ND
2015-09-2313265557ND
2015-10-2813390029ND
2016-02-0313753739ND
2016-02-0313753741ND
2016-02-0313753743ND
2016-04-0614103708ND
2016-05-1114251743ND
2016-08-1714736697ND
2017-01-1715518319ND
2017-01-1715518320ND
2017-01-1715518318ND
2017-04-0515938453ND
2017-07-1916414762ND
2017-10-1816881219ND
2018-02-288004978-01ND
2018-02-288004978-02ND
2018-02-288004978-03ND
2018-04-258008153-01ND
2018-10-038028638-01ND
2019-02-058038655-01ND
2019-02-068038655-02ND
2019-02-068038655-03ND
2019-04-249009681-01ND
2019-09-119021810-01ND
2019-12-119033959-01ND