Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Nitrite

Three Valleys Municipal Water District

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND30ND
2014ND40ND
2015ND40ND
2016ND40ND
2017ND40ND

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
2012-01-103761-004-0733ND
2012-01-103761-002-1050ND
2012-03-213761-002-1100ND
2012-07-183761-004-0752ND
2013-01-303761-004-1000ND
2013-01-303761-002-0830ND
2013-03-053761-002-1040ND
2014-01-213761-004-1006ND
2014-01-213761-002-1020ND
2014-03-113761-002-1030ND
2014-08-263761-004-1000ND
2015-02-033761-002-1000ND
2015-02-033761-004-0945ND
2015-03-103761-002-0930ND
2015-07-143761-004-0832ND
2016-02-023761-004-0828ND
2016-02-023761-002-0850ND
2016-03-153761-002-0900ND
2016-07-193761-004-0945ND
2017-02-223761-002-0828ND
2017-03-213761-002-0730ND
2017-05-163761-004-0900ND
2017-07-183761-004-0900ND