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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Alvin

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

 

112

Samples

0

Samples exceeding legal limit (MCL)

59

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.776 ppb1712ND - 1.30 ppb
20150.905 ppb1915ND - 1.50 ppb
20160.274 ppb195ND - 1.10 ppb
20170.358 ppb196ND - 1.30 ppb
20180.532 ppb199ND - 1.20 ppb
20190.695 ppb1912ND - 1.30 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
2014-02-10AC419240.800 ppb
2014-02-10AC41905ND
2014-02-10AC418991.000 ppb
2014-02-10AC41892ND
2014-02-10AC418981.10 ppb
2014-04-08AC49718ND
2014-04-08AC497281.10 ppb
2014-04-08AC497301.000 ppb
2014-04-08AC497291.000 ppb
2014-07-21AC603541.10 ppb
2014-07-21AC603551.30 ppb
2014-07-21AC603531.30 ppb
2014-07-21AC603581.20 ppb
2014-10-16AC69937ND
2014-10-16AC69939ND
2014-10-16AC699331.20 ppb
2014-10-16AC699381.10 ppb
2015-01-22AC773530.800 ppb
2015-01-22AC773510.900 ppb
2015-01-22AC773411.30 ppb
2015-01-22AC77404ND
2015-01-22AC774111.50 ppb
2015-01-22AC77403ND
2015-01-22AC774241.20 ppb
2015-05-04AC90276ND
2015-05-04AC90242ND
2015-05-04AC902751.20 ppb
2015-05-04AC902741.000 ppb
2015-07-09AC989361.20 ppb
2015-07-09AC989331.10 ppb
2015-07-09AC989381.10 ppb
2015-07-09AC989351.20 ppb
2015-10-01AD092421.50 ppb
2015-10-01AD092401.20 ppb
2015-10-01AD092211.000 ppb
2015-10-01AD092221.000 ppb
2016-01-11AD17322ND
2016-01-11AD173481.000 ppb
2016-01-11AD17334ND
2016-01-11AD17291ND
2016-01-11AD17294ND
2016-01-11AD17285ND
2016-01-11AD17282ND
2016-05-12AD36571ND
2016-05-12AD36573ND
2016-05-12AD36564ND
2016-05-12AD36569ND
2016-07-05AD429301.000 ppb
2016-07-05AD42931ND
2016-07-05AD429361.10 ppb
2016-07-05AD429331.10 ppb
2016-10-20AD54022ND
2016-10-20AD54028ND
2016-10-20AD540311.000 ppb
2016-10-20AD54023ND
2017-01-09AD636231.10 ppb
2017-01-09AD63627ND
2017-01-09AD636371.30 ppb
2017-01-09AD63559ND
2017-01-09AD635571.20 ppb
2017-01-09AD63558ND
2017-01-09AD63556ND
2017-04-11AD79162ND
2017-04-11AD79161ND
2017-04-11AD791601.000 ppb
2017-04-11AD79159ND
2017-07-11AD888341.20 ppb
2017-07-11AD88835ND
2017-07-11AD88832ND
2017-07-11AD88833ND
2017-10-02AD98771ND
2017-10-02AD98768ND
2017-10-02AD987721.000 ppb
2017-10-02AD98773ND
2018-02-20AE144511.000 ppb
2018-02-20AE14455ND
2018-02-20AE14457ND
2018-02-20AE144161.000 ppb
2018-02-20AE144141.20 ppb
2018-02-20AE144131.20 ppb
2018-02-20AE144121.20 ppb
2018-05-15AE26359ND
2018-05-15AE26361ND
2018-05-15AE263791.20 ppb
2018-05-15AE26362ND
2018-07-26AE34781ND
2018-07-26AE34778ND
2018-07-26AE34780ND
2018-07-26AE34777ND
2018-10-04AE426821.10 ppb
2018-10-04AE42680ND
2018-10-04AE426811.20 ppb
2018-10-04AE426831.000 ppb
2019-02-25AE55657ND
2019-02-25AE556471.000 ppb
2019-02-25AE55645ND
2019-02-25AE556161.000 ppb
2019-02-25AE55618ND
2019-02-25AE556111.10 ppb
2019-02-25AE556121.10 ppb
2019-04-16AE62526ND
2019-04-16AE625271.000 ppb
2019-04-16AE625081.10 ppb
2019-04-16AE62510ND
2019-07-22AE752281.10 ppb
2019-07-22AE752261.20 ppb
2019-07-22AE752271.20 ppb
2019-07-22AE752291.10 ppb
2019-10-23AE87364ND
2019-10-23AE87387ND
2019-10-23AE874031.30 ppb
2019-10-23AE873621.000 ppb