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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Danbury Water Department

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
20140.00350 ppm61ND - 0.0210 ppm
2015ND40ND
2016ND40ND
2017ND20ND
2018ND40ND
2019ND60ND

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
2014-06-24E406M77-3IOC1ND
2014-06-24E406M77-1IOC1ND
2014-09-16E409F67-5NOXND
2014-09-16E409F67-6NOXND
2014-10-21E410J14-1IOC10.0210 ppm
2014-10-21E410J14-3IOC1ND
2015-05-05E505239-2IOC1ND
2015-05-05E505239-1IOC1ND
2015-10-20E510J07-6NOXND
2015-10-20E510J07-5NOXND
2016-03-15E603E06-7NOXND
2016-03-15E603E06-8NOXND
2016-12-14192751GEND
2016-12-14192746GEND
2017-06-15200355GEND
2017-06-15200356GEND
2018-04-12212687GEND
2018-04-12212690GEND
2018-07-12NOX 200499427ND
2018-07-12NOX 200499426ND
2019-04-11NOX 200528182ND
2019-04-11NOX 200528181ND
2019-04-11NOX 200528185ND
2019-04-11NOX 200528187ND
2019-11-21NOX 200557773ND
2019-11-21NOX 200557768ND