Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Fort Bend County WCID 2

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

 

119

Samples

0

Samples exceeding legal limit (MCL)

35

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.572 ppb186ND - 2.40 ppb
20150.380 ppb205ND - 2.00 ppb
20160.375 ppb205ND - 2.70 ppb
20170.800 ppb218ND - 3.00 ppb
20180.460 ppb206ND - 1.90 ppb
20190.305 ppb205ND - 1.50 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
2014-02-04AC412610.900 ppb
2014-02-04AC41259ND
2014-02-28AC45272ND
2014-02-28AC45273ND
2014-02-28AC45275ND
2014-02-28AC45268ND
2014-04-10AC50197ND
2014-04-10AC50183ND
2014-04-10AC50180ND
2014-04-10AC50181ND
2014-07-02AC587712.40 ppb
2014-07-02AC587862.10 ppb
2014-07-02AC58784ND
2014-07-02AC587761.70 ppb
2014-10-10AC69485ND
2014-10-10AC694941.50 ppb
2014-10-10AC69484ND
2014-10-10AC694831.70 ppb
2015-02-04AC79255ND
2015-02-04AC79285ND
2015-02-04AC79287ND
2015-02-04AC79269ND
2015-02-04AC79224ND
2015-02-04AC79223ND
2015-02-04AC79225ND
2015-02-04AC79234ND
2015-04-07AC87435ND
2015-04-07AC87433ND
2015-04-07AC87439ND
2015-04-07AC87436ND
2015-07-31AD020251.60 ppb
2015-07-31AD020312.00 ppb
2015-07-31AD02033ND
2015-07-31AD02028ND
2015-10-16AD109951.50 ppb
2015-10-16AD109751.30 ppb
2015-10-16AD10976ND
2015-10-16AD109901.20 ppb
2016-01-27AD20447ND
2016-01-27AD20449ND
2016-01-27AD20425ND
2016-01-27AD20429ND
2016-01-27AD203821.20 ppb
2016-01-27AD20376ND
2016-01-27AD20378ND
2016-01-27AD20385ND
2016-04-21AD337212.70 ppb
2016-04-21AD33722ND
2016-04-21AD33727ND
2016-04-21AD337391.000 ppb
2016-09-01AD476801.30 ppb
2016-09-01AD47645ND
2016-09-01AD47642ND
2016-09-01AD476531.30 ppb
2016-10-24AD54265ND
2016-10-24AD54288ND
2016-10-24AD54294ND
2016-10-24AD54266ND
2017-01-05AD63227ND
2017-01-05AD63255ND
2017-01-05AD63217ND
2017-01-05AD63223ND
2017-01-05AD632493.00 ppb
2017-01-05AD631832.90 ppb
2017-01-05AD63177ND
2017-01-05AD63176ND
2017-01-05AD631753.00 ppb
2017-04-04AD782801.20 ppb
2017-04-04AD782781.70 ppb
2017-04-04AD78281ND
2017-04-04AD782791.60 ppb
2017-07-07AD886511.20 ppb
2017-07-07AD88648ND
2017-07-07AD88652ND
2017-07-07AD886462.20 ppb
2017-10-10AE00071ND
2017-10-10AE00076ND
2017-10-10AE00078ND
2017-10-10AE00072ND
2018-01-09AE08385ND
2018-01-09AE08397ND
2018-01-09AE08361ND
2018-01-09AE08371ND
2018-01-09AE08323ND
2018-01-09AE08322ND
2018-01-09AE08325ND
2018-01-09AE08324ND
2018-04-18AE229721.50 ppb
2018-04-18AE229711.60 ppb
2018-04-18AE22964ND
2018-04-18AE229991.30 ppb
2018-07-19AE33938ND
2018-07-19AE33943ND
2018-07-19AE33944ND
2018-07-19AE339371.40 ppb
2018-10-31AE450391.50 ppb
2018-10-31AE45040ND
2018-10-31AE45041ND
2018-10-31AE450421.90 ppb
2019-01-25AE51622ND
2019-01-25AE51579ND
2019-01-25AE51573ND
2019-01-25AE51577ND
2019-01-25AE515741.20 ppb
2019-04-11AE62086ND
2019-04-11AE62090ND
2019-04-11AE619971.30 ppb
2019-04-11AE62000ND
2019-04-11AE62003ND
2019-04-11AE620011.50 ppb
2019-07-19AE75352ND
2019-07-19AE752301.000 ppb
2019-07-19AE752321.10 ppb
2019-07-19AE75233ND
2019-07-19AE75231ND
2019-10-08AE85963ND
2019-10-08AE85964ND
2019-10-08AE85962ND
2019-10-08AE85961ND