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EWG's Tap Water Database — 2019 UPDATE

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Nitrite

Contra Costa 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.

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND100ND
2013ND110ND
2014ND120ND
2015ND110ND
2016ND20ND
2017N/A00N/A

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
2012-04-192473-003-0830ND
2012-05-152473-003-1050ND
2012-06-122473-003-1030ND
2012-07-092473-003-0800ND
2012-07-172473-003-1215ND
2012-08-142473-003-1035ND
2012-09-112473-003-1155ND
2012-10-092473-003-1020ND
2012-11-132473-003-0815ND
2012-12-042473-003-1330ND
2013-03-202473-003-1250ND
2013-04-092473-003-1035ND
2013-05-142473-003-1245ND
2013-06-112473-003-1400ND
2013-07-152473-003-1345ND
2013-07-162473-003-1000ND
2013-08-132473-003-1140ND
2013-09-102473-003-1254ND
2013-09-112473-019-1425ND
2013-10-152473-003-1300ND
2013-11-122473-003-0800ND
2014-03-102473-003-1119ND
2014-04-152473-003-0810ND
2014-05-132473-003-1255ND
2014-06-102473-003-0755ND
2014-07-152473-003-1255ND
2014-07-212473-019-1330ND
2014-07-222473-003-1345ND
2014-08-122473-003-1454ND
2014-09-092473-003-1255ND
2014-10-142473-003-0830ND
2014-11-182473-003-0830ND
2014-12-022473-003-1345ND
2015-03-182473-003-1427ND
2015-04-142473-003-1335ND
2015-05-122473-003-0821ND
2015-06-092473-003-1341ND
2015-07-062473-003-0815ND
2015-07-142473-003-1400ND
2015-08-112473-003-0955ND
2015-09-152473-003-1200ND
2015-10-132473-003-0900ND
2015-11-102473-003-0945ND
2015-12-082473-003-0900ND
2016-07-119590-003-1350ND
2016-07-112473-003-0900ND