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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Randolph Water System

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.

 

86

Samples

0

Samples exceeding legal limit (MCL)

20

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND160ND
2014ND160ND
2015ND160ND
20160.608 ppb1612ND - 0.890 ppb
20170.364 ppb168ND - 0.980 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
2012-04-101112103ND
2012-04-101112103ND
2012-09-26L0020584-01ND
2012-09-26L0020584-01ND
2012-12-18L0023941-05ND
2012-12-18L0023941-05ND
2013-03-13L0027112-03ND
2013-03-13L0027112-03ND
2013-03-18AD76123ND
2013-03-18AD76123ND
2013-05-21L0029796-02ND
2013-05-21L0029796-02ND
2013-07-23L0032417-01ND
2013-07-23L0032417-02ND
2013-07-23L0032417-02ND
2013-07-23L0032417-01ND
2013-10-14AD85953ND
2013-10-14AD85953ND
2013-10-25L0035971-02ND
2013-10-25L0035971-01ND
2013-10-25L0035971-02ND
2013-10-25L0035971-01ND
2014-01-23L0039249-01ND
2014-01-23L0039249-01ND
2014-01-23L0039249-02ND
2014-01-23L0039249-02ND
2014-05-291305265ND
2014-05-291305265ND
2014-05-291305266ND
2014-05-291305266ND
2014-07-141317726ND
2014-07-141317725ND
2014-07-141317725ND
2014-07-141317726ND
2014-10-071340254ND
2014-10-071340253ND
2014-10-071340253ND
2014-10-071340254ND
2015-01-191365943ND
2015-01-191365942ND
2015-01-191365942ND
2015-01-191365943ND
2015-04-141386912ND
2015-04-141386911ND
2015-04-141386911ND
2015-04-141386912ND
2015-07-141410278ND
2015-07-141410279ND
2015-07-141410278ND
2015-07-141410279ND
2015-10-061432815ND
2015-10-061432814ND
2015-10-061432815ND
2015-10-061432814ND
2016-01-121457675ND
2016-01-121457669ND
2016-01-121457675ND
2016-01-121457669ND
2016-04-1214818510.740 ppb
2016-04-1214818500.820 ppb
2016-04-1214818510.740 ppb
2016-04-1214818500.820 ppb
2016-07-1215064460.880 ppb
2016-07-1215064470.820 ppb
2016-07-1215064470.820 ppb
2016-07-1215064460.880 ppb
2016-10-1815342120.890 ppb
2016-10-1815342120.890 ppb
2016-10-1815342130.710 ppb
2016-10-1815342130.710 ppb
2017-01-19352901410150.980 ppb
2017-01-19352901410160.650 ppb
2017-01-19352901410160.650 ppb
2017-01-19352901410150.980 ppb
2017-04-13353065460030.610 ppb
2017-04-13353065460030.610 ppb
2017-04-13353065460040.670 ppb
2017-04-13353065460040.670 ppb
2017-07-0635322645005ND
2017-07-0635322645004ND
2017-07-0635322645004ND
2017-07-0635322645005ND
2017-10-0535340668001ND
2017-10-0535340668001ND
2017-10-0535340668002ND
2017-10-0535340668002ND