Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Nitrite

United Water Cons 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.

MORE ABOUT THIS CONTAMINANT

 

112

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.00952 ppm211ND - 0.200 ppm
2015ND200ND
2016ND160ND
2017ND200ND
2018ND160ND
2019ND190ND

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
2014-02-105867-001-0810ND
2014-04-095867-001-1113ND
2014-04-095867-004-0733ND
2014-04-095867-007-0803ND
2014-04-095867-008-0848ND
2014-04-095867-009-0903ND
2014-04-095867-010-1100ND
2014-04-095867-013-1025ND
2014-04-095867-017-0917ND
2014-05-085867-001-0900ND
2014-08-135867-001-0942ND
2014-10-155867-001-1100ND
2014-10-155867-004-0715ND
2014-10-155867-007-0748ND
2014-10-155867-008-0804ND
2014-10-155867-009-0845ND
2014-10-155867-010-0828ND
2014-10-155867-013-1000ND
2014-11-035867-025-12000.200 ppm
2014-11-105867-001-0830ND
2014-12-235867-017-0730ND
2015-02-095867-001-0752ND
2015-02-175867-026-0905ND
2015-04-145867-001-1040ND
2015-04-145867-004-0742ND
2015-04-145867-007-0705ND
2015-04-145867-008-0900ND
2015-04-145867-010-0842ND
2015-04-145867-013-1050ND
2015-04-145867-017-0812ND
2015-04-145867-026-0728ND
2015-05-125867-001-0812ND
2015-08-125867-001-0850ND
2015-10-195867-001-1100ND
2015-10-195867-004-0738ND
2015-10-195867-007-0750ND
2015-10-195867-008-1050ND
2015-10-195867-010-0920ND
2015-10-195867-017-1006ND
2015-10-195867-026-0720ND
2015-11-125867-001-0926ND
2016-02-105867-001-0816ND
2016-04-055867-001-0952ND
2016-04-055867-004-0746ND
2016-04-055867-007-0716ND
2016-04-055867-008-0816ND
2016-04-055867-010-0906ND
2016-04-055867-017-0854ND
2016-04-055867-026-0800ND
2016-05-095867-001-0822ND
2016-08-115867-001-0904ND
2016-10-275867-001-0912ND
2016-10-275867-007-0734ND
2016-10-275867-010-0810ND
2016-10-275867-017-0800ND
2016-10-275867-026-0748ND
2016-11-095867-001-0946ND
2017-02-085867-001-1030ND
2017-04-195867-001-1052ND
2017-04-195867-004-0836ND
2017-04-195867-007-0800ND
2017-04-195867-008-0816ND
2017-04-195867-010-1038ND
2017-04-195867-017-0926ND
2017-04-195867-026-0914ND
2017-05-105867-001-0730ND
2017-08-095867-001-0930ND
2017-08-095867-025-1052ND
2017-10-315867-001-1230ND
2017-10-315867-004-0716ND
2017-10-315867-007-0924ND
2017-10-315867-008-1124ND
2017-10-315867-010-0744ND
2017-10-315867-017-1200ND
2017-10-315867-026-0820ND
2017-10-315867-027-0954ND
2017-11-085867-001-1100ND
2018-02-125867-001-0924ND
2018-04-175867-001-0956ND
2018-04-175867-004-0749ND
2018-04-175867-007-1040ND
2018-04-175867-010-0856ND
2018-04-175867-017-0843ND
2018-04-175867-026-0820ND
2018-04-175867-027-0918ND
2018-05-085867-001-0825ND
2018-08-085867-001-0730ND
2018-10-095867-004-0818ND
2018-10-095867-007-0840ND
2018-10-095867-017-0927ND
2018-10-095867-026-0908ND
2018-10-095867-027-1016ND
2018-11-215867-013-0828ND
2019-02-125867-001-0925ND
2019-04-105867-001-0745ND
2019-04-105867-004-0822ND
2019-04-105867-007-0853ND
2019-04-105867-008-1040ND
2019-04-105867-013-1014ND
2019-04-105867-017-0924ND
2019-04-105867-026-0908ND
2019-04-105867-027-1026ND
2019-08-145867-001-0825ND
2019-10-085867-001-0755ND
2019-10-085867-004-0835ND
2019-10-085867-007-0959ND
2019-10-085867-008-1010ND
2019-10-085867-010-1025ND
2019-10-085867-013-0813ND
2019-10-085867-017-0945ND
2019-10-085867-026-0855ND
2019-10-085867-027-1050ND