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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Fredericksburg

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

 

106

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
2014ND160ND
2015ND180ND
2016ND180ND
2017ND180ND
2018ND180ND
2019ND180ND

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
2014-02-17AC43026ND
2014-02-17AC43040ND
2014-02-17AC43020ND
2014-02-17AC43039ND
2014-04-10AC50199ND
2014-04-10AC50161ND
2014-04-10AC50164ND
2014-04-10AC50163ND
2014-08-07AC62657ND
2014-08-07AC62641ND
2014-08-07AC62640ND
2014-08-07AC62648ND
2014-11-03AC71030ND
2014-11-03AC71021ND
2014-11-03AC71013ND
2014-11-03AC71024ND
2015-02-02AC78767ND
2015-02-02AC78771ND
2015-02-02AC78723ND
2015-02-02AC78674ND
2015-02-02AC78695ND
2015-02-02AC78693ND
2015-04-13AC87948ND
2015-04-13AC87947ND
2015-04-13AC87943ND
2015-04-13AC87944ND
2015-07-13AC99106ND
2015-07-13AC99077ND
2015-07-13AC99067ND
2015-07-13AC99107ND
2015-10-27AD11805ND
2015-10-27AD11814ND
2015-10-27AD11816ND
2015-10-27AD11804ND
2016-01-20AD18970ND
2016-01-20AD18966ND
2016-01-20AD18887ND
2016-01-20AD18879ND
2016-01-20AD18878ND
2016-01-20AD18880ND
2016-04-14AD33164ND
2016-04-14AD33157ND
2016-04-14AD33159ND
2016-04-14AD33162ND
2016-08-04AD47038ND
2016-08-04AD47035ND
2016-08-04AD47034ND
2016-08-04AD47036ND
2016-10-05AD52529ND
2016-10-05AD52531ND
2016-10-05AD52533ND
2016-10-05AD52535ND
2017-01-24AD66460ND
2017-01-24AD66376ND
2017-01-24AD66393ND
2017-01-24AD66375ND
2017-01-24AD66394ND
2017-04-25AD80958ND
2017-04-25AD80917ND
2017-04-25AD80916ND
2017-04-25AD80918ND
2017-04-25AD80909ND
2017-07-26AD90779ND
2017-07-26AD90782ND
2017-07-26AD90781ND
2017-07-26AD90780ND
2017-10-03AD99007ND
2017-10-03AD99008ND
2017-10-03AD99009ND
2017-10-03AD99010ND
2018-02-12AE13336ND
2018-02-12AE13334ND
2018-02-12AE13267ND
2018-02-12AE13260ND
2018-02-12AE13264ND
2018-02-12AE13243ND
2018-05-09AE25730ND
2018-05-09AE25729ND
2018-05-09AE25728ND
2018-05-09AE25731ND
2018-08-29AE38784ND
2018-08-29AE38790ND
2018-08-29AE38791ND
2018-08-29AE38789ND
2018-10-11AE43245ND
2018-10-11AE43243ND
2018-10-11AE43244ND
2018-10-11AE43246ND
2019-01-15AE49857ND
2019-01-15AE49859ND
2019-01-15AE49800ND
2019-01-15AE49799ND
2019-01-15AE49794ND
2019-01-15AE49801ND
2019-04-23AE63358ND
2019-04-23AE63361ND
2019-04-23AE63354ND
2019-04-23AE63362ND
2019-07-09AE73616ND
2019-07-09AE73617ND
2019-07-09AE73618ND
2019-07-09AE73619ND
2019-10-21AE87028ND
2019-10-21AE87026ND
2019-10-21AE87025ND
2019-10-21AE87027ND