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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

CTWC - Shoreline Region-Guilford 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.

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104

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.000522 ppm233ND - 0.00500 ppm
2015ND160ND
2016ND170ND
2017ND100ND
2018ND150ND
2019ND230ND

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
2014-01-06142NOX0.00500 ppm
2014-01-29140130CWCDNOXND
2014-01-29140130CWCEIOC1ND
2014-01-2991886NOXND
2014-01-2991887NOXND
2014-02-0691982NOXND
2014-02-2492178NOXND
2014-03-052669IOC1ND
2014-03-052673IOC10.00300 ppm
2014-03-052674IOC10.00400 ppm
2014-03-052676IOC1ND
2014-04-014079NOXND
2014-06-128366IOC1ND
2014-06-128367IOC1ND
2014-06-1293879NOXND
2014-06-1293880NOXND
2014-06-1293881NOXND
2014-07-2210660NOXND
2014-08-13140915-0115IOC1ND
2014-08-13141007-0044IOC1ND
2014-08-13BG93593NOXND
2014-08-13BG93595NOXND
2014-11-20BH44138NOXND
2015-02-11BH72588NOXND
2015-02-11BH72586NOXND
2015-02-11BH72587NOXND
2015-02-11BH72589NOXND
2015-02-12BH73177NOXND
2015-04-01BH90872NOXND
2015-06-02BJ24597NOXND
2015-06-02BJ24602NOXND
2015-06-02BJ24619NOXND
2015-06-02BJ24600NOXND
2015-06-02BJ24617NOXND
2015-06-03BJ25406NOXND
2015-06-03BJ25404NOXND
2015-07-07BJ42388NOXND
2015-07-27BJ63961NOXND
2015-10-07BK03851NOXND
2016-01-11BK50861NOXND
2016-01-11BK50864NOXND
2016-01-12BK51721NOXND
2016-01-19BK54776NOXND
2016-01-19BK54777NOXND
2016-01-27BK58354NOXND
2016-02-11BK64352NOXND
2016-03-14BK78121NOXND
2016-04-06BN07656NOXND
2016-06-01BN44876NOXND
2016-07-06BN67632NOXND
2016-07-12BN71483NOXND
2016-07-12BN71475NOXND
2016-07-13BN72281NOXND
2016-07-13BN72289NOXND
2016-07-13BN72288NOXND
2016-10-12BV46547NOXND
2017-01-17BX30298NOXND
2017-01-17BX30299NOXND
2017-01-18BX31347NOXND
2017-01-30BX40966NOXND
2017-03-08BX82062NOXND
2017-03-08BX82063NOXND
2017-04-03BX97712NOXND
2017-07-17BY61083NOXND
2017-10-24BZ27135NOXND
2017-12-04BZ49884NOXND
2018-01-16BZ73475NOXND
2018-03-30CA11466NOXND
2018-06-04CA63507NOXND
2018-06-13CA69714NOXND
2018-06-13CA69718NOXND
2018-06-13CA69716NOXND
2018-06-13CA69715NOXND
2018-06-13CA69717NOXND
2018-06-20CA75544NOXND
2018-09-19NOX 200506169ND
2018-10-09NOX 200508367ND
2018-11-08NOX 200512198ND
2018-11-21NOX 200513547ND
2018-11-26NOX 200513931ND
2018-12-10NOX 200515324ND
2019-01-07NOX 200517748ND
2019-01-30NOX 200520057ND
2019-02-06NOX 200520859ND
2019-02-07NOX 200521039ND
2019-03-05NOX 200523518ND
2019-04-02NOX 200526702ND
2019-04-08NOX 200527439ND
2019-05-06NOX 200530919ND
2019-06-05NOX 200535054ND
2019-06-24NOX 200537625ND
2019-07-09NOX 200539960ND
2019-07-10NOX 200539996ND
2019-07-10NOX 200539998ND
2019-07-16NOX 200541091ND
2019-07-16NOX 200540648ND
2019-07-16NOX 200540644ND
2019-08-05NOX 200545065ND
2019-09-11NOX 200548435ND
2019-09-17NOX 200549238ND
2019-09-18NOX 200549465ND
2019-10-02NOX 200551087ND
2019-11-12NOX 200556637ND
2019-12-05NOX 200559108ND