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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Connecticut Water Company - Northern Region-Western System

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

 

107

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.000300 ppm301ND - 0.00900 ppm
20150.00362 ppm211ND - 0.0760 ppm
2016ND200ND
2017ND130ND
2018ND120ND
2019ND110ND

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
2014-01-06BF95192NOXND
2014-01-15BF99638NOXND
2014-01-16BG00211NOXND
2014-01-28BG04228IOC1ND
2014-01-28BG04228NOXND
2014-01-29BG04219NOXND
2014-01-29BG04659IOC1ND
2014-03-17GBG19879NOXND
2014-04-03BG27981NOXND
2014-04-03BG37981NOXND
2014-04-094561IOC1ND
2014-04-094561NOXND
2014-04-22BG35279NOXND
2014-04-25BG37305NOXND
2014-05-076132NOX0.00900 ppm
2014-05-21BG47680NOXND
2014-06-04BG53346NOXND
2014-06-05BG53878IOC1ND
2014-06-05BG53878NOXND
2014-06-06BG54002NOXND
2014-06-17BG60666NOXND
2014-06-19BG62968NOXND
2014-06-30BG67304NOXND
2014-07-01BG68349NOXND
2014-07-01BG68352NOXND
2014-07-02BG68647NOXND
2014-07-30BG85048NOXND
2014-10-30BH34534NOXND
2014-11-21141121-0002IOC1ND
2014-11-21BH44966NOXND
2015-01-09BH61610NOXND
2015-01-16BH64370NOXND
2015-01-20BH64902NOXND
2015-02-23BH76101NOXND
2015-03-06BH80296NOXND
2015-03-19BH86047NOXND
2015-04-29BJ09906NOXND
2015-04-29BJ09904NOXND
2015-04-30BJ10452NOXND
2015-04-30BJ10443NOXND
2015-04-30BJ10445NOXND
2015-05-20BJ19795NOX0.0760 ppm
2015-05-20BJ19799NOXND
2015-07-07BJ42534NOXND
2015-07-30BJ65815NOXND
2015-07-30BJ65812NOXND
2015-08-27BJ82984NOXND
2015-10-15BK08820NOXND
2015-11-30BK29149NOXND
2015-12-23BK43694NOXND
2015-12-28BK44425NOXND
2016-01-15BK53768NOXND
2016-01-27BK58483NOXND
2016-01-27BK58485NOXND
2016-01-27BK58484NOXND
2016-03-18BK81669NOXND
2016-04-21BN17626NOXND
2016-05-12BN31364NOXND
2016-05-19BN35998NOXND
2016-05-24BN39642NOXND
2016-05-25BN40000NOXND
2016-06-22BN61158NOXND
2016-06-24BN62539NOXND
2016-07-01BN66356NOXND
2016-07-01BN66354NOXND
2016-07-22BN79282NOXND
2016-09-15BV16051NOXND
2016-09-29BV31669NOXND
2016-10-06BV40210NOXND
2016-10-11BV44061NOXND
2016-10-18BV56707NOXND
2017-01-06BX17339NOXND
2017-02-08BX57436NOXND
2017-03-03BX79851NOXND
2017-04-06BY00572NOXND
2017-04-20BY07159NOXND
2017-04-21BY07962NOXND
2017-05-30BY30818NOXND
2017-06-14BY39226NOXND
2017-06-23BY45937NOXND
2017-07-07BY54440NOXND
2017-07-07BY54441NOXND
2017-09-22BZ07174NOXND
2017-11-10BZ39757NOXND
2018-01-12BZ72529NOXND
2018-01-12BZ72527NOXND
2018-01-12BZ72528NOXND
2018-01-23BZ78886NOXND
2018-01-23BZ78887NOXND
2018-01-31BZ82949NOXND
2018-03-02BZ97488NOXND
2018-04-19CA23517NOXND
2018-07-12CA89150ND
2018-07-13CA89903ND
2018-07-20CA94720ND
2018-12-10NOX 200515418ND
2019-01-02NOX 200517305ND
2019-01-15NOX 200518779ND
2019-03-15NOX 200524883ND
2019-03-22NOX 200525613ND
2019-03-22NOX 200525612ND
2019-05-30NOX 200534244ND
2019-05-30NOX 200534243ND
2019-07-02NOX 200538782ND
2019-07-02NOX 200538771ND
2019-07-18NOX 200541147ND
2019-10-03NOX 200551371ND