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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Danbury Water Department

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

MORE ABOUT THIS CONTAMINANT

 

22

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0295 ppm62ND - 0.120 ppm
2015N/A00N/A
20160.0875 ppm42ND - 0.190 ppm
2017ND20ND
20180.349 ppm440.0870 ppm - 0.640 ppm
20190.120 ppm660.0300 ppm - 0.230 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2014-06-24E406M77-3IOC1ND
2014-06-24E406M77-1IOC10.0570 ppm
2014-09-16E409F67-5NOXND
2014-09-16E409F67-6NOXND
2014-10-21E410J14-1IOC10.120 ppm
2014-10-21E410J14-3IOC1ND
2016-03-15E603E06-7NOX0.160 ppm
2016-03-15E603E06-8NOX0.190 ppm
2016-12-14192746GEND
2016-12-14192751GEND
2017-06-15200356GEND
2017-06-15200355GEND
2018-04-12212687GE0.640 ppm
2018-04-12212690GE0.580 ppm
2018-07-12NOX 2004994270.0870 ppm
2018-07-12NOX 2004994260.0870 ppm
2019-04-11NOX 2005281820.0490 ppm
2019-04-11NOX 2005281810.181 ppm
2019-04-11NOX 2005281850.173 ppm
2019-04-11NOX 2005281870.0300 ppm
2019-11-21NOX 2005577730.0590 ppm
2019-11-21NOX 2005577680.230 ppm