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EWG's Tap Water Database — 2021 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.

MORE ABOUT THIS CONTAMINANT

 

63

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
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
20180.352 ppm880.0190 ppm - 2.51 ppm
20190.170 ppm26260.00300 ppm - 2.05 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
2014-01-06144NOXND
2014-01-29140130CWCCNOXND
2014-01-29140130CWCFIOC1ND
2014-04-014082NOXND
2014-04-2193058NOX1.77 ppm
2014-08-13BG93531IOC11.000 ppm
2014-08-27BG93545NOXND
2014-08-28141001-0005NOX0.550 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
2018-01-24BZ79725NOX0.1000 ppm
2018-03-30CA11471NOX0.0500 ppm
2018-06-04CA63496NOX0.0400 ppm
2018-06-06CA65076NOX2.51 ppm
2018-09-19NOX 2005061920.0190 ppm
2018-10-09NOX 2005083780.0380 ppm
2018-11-08NOX 2005122140.0270 ppm
2018-12-11NOX 2005158650.0280 ppm
2019-01-08NOX 2005179180.0280 ppm
2019-02-06NOX 2005210350.0250 ppm
2019-03-06NOX 2005239010.0190 ppm
2019-03-06NOX 2005239000.0140 ppm
2019-03-11NOX 2005242950.0190 ppm
2019-04-02NOX 2005270380.0170 ppm
2019-04-02NOX 2005270320.00600 ppm
2019-05-06NOX 2005309940.0120 ppm
2019-05-06NOX 2005309930.00400 ppm
2019-06-10NOX 2005358260.00300 ppm
2019-06-10NOX 2005359330.0120 ppm
2019-06-20NOX 2005382012.05 ppm
2019-06-20NOX 2005382062.03 ppm
2019-07-08NOX 2005399760.0220 ppm
2019-07-29NOX 2005423460.0240 ppm
2019-07-29NOX 2005423440.00900 ppm
2019-08-05NOX 2005433990.0220 ppm
2019-08-05NOX 2005433960.00700 ppm
2019-09-11NOX 2005486570.0200 ppm
2019-09-11NOX 2005484380.00600 ppm
2019-10-04NOX 2005515670.0210 ppm
2019-10-04NOX 2005515110.01000 ppm
2019-11-07NOX 2005557380.0110 ppm
2019-11-07NOX 2005557360.00300 ppm
2019-12-04NOX 2005591390.0130 ppm
2019-12-04NOX 2005591330.0110 ppm