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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Roswell Municipal 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.

MORE ABOUT THIS CONTAMINANT

 

94

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.0144 ppb161ND - 0.230 ppb
20150.0438 ppb163ND - 0.320 ppb
20160.0263 ppb163ND - 0.170 ppb
20170.00750 ppb161ND - 0.120 ppb
20180.0336 ppb142ND - 0.270 ppb
2019ND160ND

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
2014-02-192014005814ND
2014-02-192014005815ND
2014-02-192014005812ND
2014-02-192014005813ND
2014-04-222014013876ND
2014-04-222014013877ND
2014-04-222014013875ND
2014-04-222014013874ND
2014-07-242014023526ND
2014-07-242014023527ND
2014-07-242014023528ND
2014-07-242014023525ND
2014-10-2220140332880.230 ppb
2014-10-222014033285ND
2014-10-222014033286ND
2014-10-222014033287ND
2015-01-202015002207ND
2015-01-202015002206ND
2015-01-202015002208ND
2015-01-202015002205ND
2015-04-142015011526ND
2015-04-142015011524ND
2015-04-142015011523ND
2015-04-142015011525ND
2015-07-142015020438ND
2015-07-142015020440ND
2015-07-142015020439ND
2015-07-1420150204410.190 ppb
2015-10-2720150322630.320 ppb
2015-10-2720150322640.190 ppb
2015-10-272015032261ND
2015-10-272015032262ND
2016-01-262016002556ND
2016-01-262016002558ND
2016-01-262016002557ND
2016-01-2720160025550.170 ppb
2016-04-202016011291ND
2016-04-202016011292ND
2016-04-202016011290ND
2016-04-202016011289ND
2016-07-2520160212280.1000 ppb
2016-07-252016021230ND
2016-07-252016021227ND
2016-07-252016021229ND
2016-10-172016030145ND
2016-10-172016030143ND
2016-10-1720160301460.150 ppb
2016-10-172016030144ND
2017-01-1720170013680.120 ppb
2017-01-172017001367ND
2017-01-172017001369ND
2017-01-172017001366ND
2017-04-172017011270ND
2017-04-172017011269ND
2017-04-172017011268ND
2017-04-172017011267ND
2017-07-252017021566ND
2017-07-252017021564ND
2017-07-252017021565ND
2017-07-252017021567ND
2017-10-262017030971ND
2017-10-262017030969ND
2017-10-262017030968ND
2017-10-262017030970ND
2018-01-182018001892ND
2018-01-182018001891ND
2018-01-182018001890ND
2018-04-052018009845ND
2018-04-052018009844ND
2018-04-052018009843ND
2018-07-022018018267ND
2018-07-022018018266ND
2018-07-022018018265ND
2018-07-022018018268ND
2018-10-0920180288970.200 ppb
2018-10-092018028898ND
2018-10-0920180288990.270 ppb
2018-10-092018028900ND
2019-01-092019000681ND
2019-01-092019000682ND
2019-01-092019000683ND
2019-01-092019000684ND
2019-04-022019008479ND
2019-04-022019008480ND
2019-04-022019008481ND
2019-04-022019008478ND
2019-07-092019018727ND
2019-07-092019018730ND
2019-07-092019018729ND
2019-07-092019018728ND
2019-10-032019028342ND
2019-10-032019028341ND
2019-10-032019028340ND
2019-10-032019028339ND