Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

East Lyme Water & Sewer Commission

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

74

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.213 ppb163ND - 1.90 ppb
20150.869 ppb167ND - 3.80 ppb
20160.0917 ppb122ND - 0.600 ppb
2017ND100ND
20180.0900 ppb101ND - 0.900 ppb
20190.300 ppb103ND - 1.60 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-0692331CHND
2014-03-0692332CHND
2014-03-0692333CHND
2014-03-0692330CHND
2014-05-1493438CHND
2014-05-1493439CH1.90 ppb
2014-05-1493440CHND
2014-05-1493441CHND
2014-07-1794365CHND
2014-07-1794367CHND
2014-07-1794366CH0.600 ppb
2014-07-1794364CHND
2014-10-2795928CHND
2014-10-2795929CHND
2014-10-2795930CH0.900 ppb
2014-10-2795931CHND
2015-02-0597295CH3.80 ppb
2015-02-0597297CHND
2015-02-0597296CHND
2015-02-0597294CH0.800 ppb
2015-05-0898758CH2.60 ppb
2015-05-0898759CHND
2015-05-0898760CHND
2015-05-0898761CHND
2015-08-12100413CH2.30 ppb
2015-08-12100414CHND
2015-08-12100415CH1.80 ppb
2015-08-12100416CH1.10 ppb
2015-10-15101616CH1.50 ppb
2015-10-15101617CHND
2015-10-15101618CHND
2015-10-15101619CHND
2016-02-04103394CHND
2016-02-04103395CHND
2016-02-04103396CHND
2016-02-04103392CH0.500 ppb
2016-02-04103391CHND
2016-02-04103393CH0.600 ppb
2016-05-02104825CHND
2016-05-02104826CHND
2016-08-01106398GEND
2016-08-01106399GEND
2016-12-06108644GEND
2016-12-06108645GEND
2017-01-31109466GEND
2017-01-31109465GEND
2017-05-09111182GEND
2017-05-09111183GEND
2017-05-09111184GEND
2017-05-09111185GEND
2017-09-14113544GEND
2017-09-14113545GEND
2017-12-11115013GEND
2017-12-11115014GEND
2018-02-06115853GEND
2018-02-06115856GEND
2018-02-06115854GE0.900 ppb
2018-02-06115855GEND
2018-05-22117860GEND
2018-05-22117861GEND
2018-09-07120043ND
2018-09-07120044ND
2018-12-18121897ND
2018-12-18121898ND
2019-03-06123279ND
2019-03-06123278ND
2019-06-271256730.900 ppb
2019-06-27125674ND
2019-09-101273891.60 ppb
2019-09-101273900.500 ppb
2019-09-10127391ND
2019-12-18129475ND
2019-12-18129476ND
2019-12-18129477ND