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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Black Bayou Water Association

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

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND60ND
2016ND60ND
2017ND40ND
2018ND60ND
2019ND40ND

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
2014-01-21140122-021NIND
2014-02-17140218-014NIND
2014-02-22170223-056NIND
2014-11-03141104-110NIND
2014-11-03141104-083NIND
2014-11-03141104-068NIND
2014-11-03141104-067NIND
2014-11-12141113-031NIND
2015-02-11150212-016NIND
2015-05-26150527-063NIND
2015-05-26150527-039NIND
2015-05-27150528-008NIND
2015-05-27150528-007NIND
2015-05-27150528-006NIND
2016-04-06160407-004NIND
2016-06-01160602-050NIND
2016-06-01160602-067NIND
2016-06-01160602-045NIND
2016-06-01160602-033NIND
2016-06-06160607-014NIND
2017-11-08171109-018NIND
2017-11-08171109-015NIND
2017-11-08171109-012NIND
2017-11-08171109-011NIND
2018-02-14180215-014NIND
2018-04-09180410-059NIND
2018-04-09180410-053NIND
2018-04-09180410-052NIND
2018-04-09180410-051NIND
2018-06-11180612-003NIND
2019-05-14190515-032NIND
2019-05-14190515-035NIND
2019-05-14190515-034NIND
2019-05-14190515-033NIND