Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Nitrite

City of Colton

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

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND110ND
2015ND10ND
2016ND10ND
2017ND100ND
2018ND20ND
2019ND10ND

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
2014-08-143761-030-0950ND
2014-08-143761-024-1300ND
2014-08-143761-023-1315ND
2014-08-143761-021-1000ND
2014-08-143761-017-1410ND
2014-08-143761-015-1030ND
2014-08-143761-014-1025ND
2014-08-143761-012-1010ND
2014-08-143761-011-1040ND
2014-08-143761-008-1045ND
2014-09-173761-022-1315ND
2015-08-033761-010-0930ND
2016-06-133761-016-1030ND
2017-09-063761-024-1245ND
2017-09-063761-030-1210ND
2017-09-063761-023-1140ND
2017-09-063761-021-1230ND
2017-09-063761-016-1520ND
2017-09-063761-015-1115ND
2017-09-063761-014-1100ND
2017-09-063761-011-1130ND
2017-09-063761-010-1455ND
2017-09-063761-008-1125ND
2018-06-123761-023-1000ND
2018-09-063761-012-1330ND
2019-07-303761-017-0830ND