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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Connecticut Water Company - Shoreline Region-chester System

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.

 

41

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.232 ppm83ND - 1.74 ppm
20130.194 ppm82ND - 1.45 ppm
20140.371 ppm94ND - 1.77 ppm
2015N/A00N/A
20160.390 ppm94ND - 1.41 ppm
20170.236 ppm770.01000 ppm - 1.35 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
2012-01-04070IOCR0.108 ppm
2012-01-04070NOX0.00800 ppm
2012-01-04071IOC1ND
2012-01-0481958NOXND
2012-04-0983920NOXND
2012-04-2584247NOX1.74 ppm
2012-07-1085484NOXND
2012-10-0186643NOXND
2013-01-08247NOXND
2013-01-08247IOC1ND
2013-01-08245NOXND
2013-01-08245IOCR0.102 ppm
2013-04-014054NOXND
2013-06-2089320NOX1.45 ppm
2013-07-029528NOXND
2013-10-0715078NOXND
2014-01-06144NOX0.00600 ppm
2014-01-29140130CWCCNOXND
2014-01-29140130CWCFIOC1ND
2014-04-014082NOXND
2014-04-2193058NOX1.77 ppm
2014-08-13BG93531IOC11.000 ppm
2014-08-27BG93545NOXND
2014-08-28141001-0005NOX0.560 ppm
2014-11-20BH44137NOXND
2016-01-12BK51717NOXND
2016-01-27BK58356IOCR0.0300 ppm
2016-01-27BK58353NOXND
2016-04-06BN07655NOXND
2016-05-25BN40398NOX1.21 ppm
2016-07-12BN71471NOX1.41 ppm
2016-07-19BN75761NOXND
2016-10-17BV53716NOXND
2016-11-09BV80127NOX0.860 ppm
2017-01-11BX19785NOX0.0700 ppm
2017-01-18BX33132NOX0.0700 ppm
2017-04-03BX97693NOX0.0300 ppm
2017-06-12BY37361IOCR0.01000 ppm
2017-07-17BY61072NOX0.0400 ppm
2017-11-15BZ42288NOX1.35 ppm
2017-12-04BZ49886NOX0.0800 ppm