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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

Connecticut Water Company - Shoreline Region-chester System

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

43

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.249 ppm71ND - 1.74 ppm
20130.207 ppm71ND - 1.45 ppm
20140.369 ppm93ND - 1.77 ppm
20150.422 ppm62ND - 1.48 ppm
20160.435 ppm83ND - 1.41 ppm
20170.273 ppm660.0300 ppm - 1.35 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2012-01-04070NOXND
2012-01-04071IOC1ND
2012-01-0481958NOXND
2012-04-0983920NOXND
2012-04-2584247NOX1.74 ppm
2012-07-1085484NOXND
2012-10-0186643NOXND
2013-01-08245NOXND
2013-01-08247IOC1ND
2013-01-08247NOXND
2013-04-014054NOXND
2013-06-2089320NOX1.45 ppm
2013-07-029528NOXND
2013-10-0715078NOXND
2014-01-06144NOXND
2014-01-29140130CWCFIOC1ND
2014-01-29140130CWCCNOXND
2014-04-014082NOXND
2014-04-2193058NOX1.77 ppm
2014-08-13BG93531IOC11.000 ppm
2014-08-27BG93545NOXND
2014-08-28141001-0005NOX0.550 ppm
2014-11-20BH44137NOXND
2015-02-12BH73176NOXND
2015-04-22BJ06211NOXND
2015-06-17BJ32481NOX1.48 ppm
2015-07-07BJ42393NOXND
2015-07-27BJ63970NOX1.05 ppm
2015-10-07BK03856NOXND
2016-01-12BK51717NOXND
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
2017-07-17BY61072NOX0.0400 ppm
2017-11-15BZ42288NOX1.35 ppm
2017-12-04BZ49886NOX0.0800 ppm