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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Lee County WSC

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

 

140

Samples

0

Samples exceeding legal limit (MCL)

23

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.210 ppb205ND - 1.10 ppb
20150.242 ppb245ND - 1.40 ppb
20160.246 ppb244ND - 1.70 ppb
20170.0680 ppb251ND - 1.70 ppb
20180.204 ppb244ND - 1.60 ppb
20190.243 ppb234ND - 1.80 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
2014-02-25AC445121.10 ppb
2014-02-25AC445080.500 ppb
2014-02-25AC44498ND
2014-02-25AC44479ND
2014-02-25AC444771.000 ppb
2014-02-25AC44480ND
2014-05-13AC54050ND
2014-05-13AC54047ND
2014-05-13AC54049ND
2014-05-13AC54048ND
2014-05-13AC53985ND
2014-05-13AC539870.500 ppb
2014-08-14AC63796ND
2014-08-14AC63792ND
2014-08-14AC637951.10 ppb
2014-08-14AC63807ND
2014-12-08AC73987ND
2014-12-08AC73981ND
2014-12-08AC73982ND
2014-12-08AC73988ND
2015-03-04AC82924ND
2015-03-04AC829301.40 ppb
2015-03-04AC82926ND
2015-03-04AC82932ND
2015-03-04AC82934ND
2015-03-04AC82892ND
2015-03-04AC82665ND
2015-03-04AC827341.10 ppb
2015-03-04AC826661.30 ppb
2015-03-04AC82662ND
2015-06-17AC96380ND
2015-06-17AC96390ND
2015-06-17AC96240ND
2015-06-17AC96252ND
2015-06-17AC962531.000 ppb
2015-06-17AC96251ND
2015-09-01AD05145ND
2015-09-01AD05137ND
2015-09-01AD05139ND
2015-09-01AD05131ND
2015-11-13AD135851.000 ppb
2015-11-13AD13550ND
2015-11-13AD13549ND
2015-11-13AD13546ND
2016-01-27AD20427ND
2016-01-27AD20423ND
2016-01-27AD20415ND
2016-01-27AD20413ND
2016-01-27AD20347ND
2016-01-27AD20345ND
2016-01-27AD20346ND
2016-01-27AD20344ND
2016-04-12AD328431.10 ppb
2016-04-12AD32845ND
2016-04-12AD32765ND
2016-04-12AD32766ND
2016-04-12AD32768ND
2016-04-12AD32770ND
2016-07-26AD45660ND
2016-07-26AD45665ND
2016-07-26AD45667ND
2016-07-26AD45662ND
2016-09-08AD485021.60 ppb
2016-10-31AD55457ND
2016-10-31AD55452ND
2016-10-31AD55453ND
2016-10-31AD554541.50 ppb
2016-10-31AD555641.70 ppb
2017-01-30AD675391.70 ppb
2017-01-30AD67529ND
2017-01-30AD67533ND
2017-01-30AD67509ND
2017-01-30AD67506ND
2017-01-30AD67511ND
2017-01-30AD67510ND
2017-04-11AD79180ND
2017-05-04AD82777ND
2017-05-04AD82781ND
2017-05-04AD82775ND
2017-05-04AD82730ND
2017-05-04AD82731ND
2017-05-04AD82732ND
2017-05-30AD85893ND
2017-07-24AD90323ND
2017-07-24AD90322ND
2017-07-24AD90327ND
2017-07-24AD90326ND
2017-07-24AD90394ND
2017-10-04AD99243ND
2017-10-04AD99231ND
2017-10-04AD99236ND
2017-10-04AD99235ND
2017-10-04AD99282ND
2018-02-20AE14425ND
2018-02-20AE144291.60 ppb
2018-02-20AE14427ND
2018-02-20AE14423ND
2018-02-20AE14417ND
2018-02-20AE14415ND
2018-02-20AE144101.000 ppb
2018-02-20AE14409ND
2018-05-03AE25082ND
2018-05-03AE25074ND
2018-05-03AE25072ND
2018-05-03AE25030ND
2018-05-03AE25029ND
2018-05-03AE25028ND
2018-05-03AE25027ND
2018-07-10AE32804ND
2018-07-10AE32760ND
2018-07-10AE32757ND
2018-07-10AE327581.20 ppb
2018-07-10AE32756ND
2018-10-09AE42913ND
2018-10-09AE42914ND
2018-10-09AE429151.10 ppb
2018-10-09AE42916ND
2019-01-15AE498231.40 ppb
2019-01-15AE49831ND
2019-01-15AE49825ND
2019-01-15AE49821ND
2019-01-15AE49827ND
2019-01-15AE49784ND
2019-01-15AE49786ND
2019-01-15AE49785ND
2019-01-15AE497811.30 ppb
2019-04-10AE61828ND
2019-04-10AE61793ND
2019-04-10AE61792ND
2019-04-10AE61791ND
2019-04-10AE617881.80 ppb
2019-07-26AE76071ND
2019-07-26AE76064ND
2019-07-26AE76065ND
2019-07-26AE760661.10 ppb
2019-07-26AE76067ND
2019-11-19AE89738ND
2019-11-19AE89736ND
2019-11-19AE89739ND
2019-11-19AE89734ND