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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Chino Hills

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

 

172

Samples

0

Samples exceeding legal limit (MCL)

142

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.18 ppb1917ND - 3.90 ppb
20151.64 ppb3223ND - 3.80 ppb
20164.79 ppb2725ND - 7.30 ppb
20175.63 ppb3622ND - 15.0 ppb
20188.24 ppb2422ND - 14.0 ppb
20198.09 ppb3433ND - 29.0 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
2014-01-234790-001-1300ND
2014-01-234790-017-1330ND
2014-05-224790-601-10051.60 ppb
2014-05-224790-602-09101.50 ppb
2014-05-224790-603-14501.50 ppb
2014-05-224790-604-10201.60 ppb
2014-05-224790-605-09301.80 ppb
2014-05-224790-606-15151.60 ppb
2014-05-224790-607-09501.50 ppb
2014-05-224790-608-10351.50 ppb
2014-08-124790-601-10003.70 ppb
2014-08-124790-602-08553.60 ppb
2014-08-124790-603-12003.80 ppb
2014-08-124790-604-10203.40 ppb
2014-08-124790-605-09202.90 ppb
2014-08-124790-606-10502.90 ppb
2014-08-124790-607-09353.90 ppb
2014-08-124790-608-10353.60 ppb
2014-11-134790-601-10200.950 ppb
2015-02-194790-601-1115ND
2015-02-194790-602-12000.660 ppb
2015-02-194790-603-09151.60 ppb
2015-02-194790-604-10451.90 ppb
2015-02-194790-605-11302.20 ppb
2015-02-194790-606-08451.60 ppb
2015-02-194790-607-1030ND
2015-02-194790-608-11001.50 ppb
2015-05-214790-601-1000ND
2015-05-214790-602-0830ND
2015-05-214790-603-1050ND
2015-05-214790-604-0915ND
2015-05-214790-605-1015ND
2015-05-214790-606-0930ND
2015-05-214790-607-1030ND
2015-05-214790-608-09000.560 ppb
2015-08-274790-601-10453.20 ppb
2015-08-274790-602-09353.00 ppb
2015-08-274790-603-08103.80 ppb
2015-08-274790-604-11253.70 ppb
2015-08-274790-605-10103.60 ppb
2015-08-274790-606-08303.00 ppb
2015-08-274790-607-08502.90 ppb
2015-08-274790-608-10303.40 ppb
2015-11-174790-601-10401.80 ppb
2015-11-174790-602-10201.90 ppb
2015-11-174790-603-12201.70 ppb
2015-11-174790-604-11152.10 ppb
2015-11-174790-605-10002.20 ppb
2015-11-174790-606-11502.10 ppb
2015-11-174790-607-09452.00 ppb
2015-11-174790-608-11052.00 ppb
2016-02-234790-601-10001.70 ppb
2016-03-034790-014-1130ND
2016-03-034790-024-10301.80 ppb
2016-05-264790-601-11456.70 ppb
2016-05-264790-602-14455.80 ppb
2016-05-264790-603-08456.70 ppb
2016-05-264790-604-09507.10 ppb
2016-05-264790-605-11107.20 ppb
2016-05-264790-606-12406.50 ppb
2016-05-264790-607-11306.40 ppb
2016-05-264790-608-10407.30 ppb
2016-08-259588-601-12255.00 ppb
2016-08-259588-602-13204.80 ppb
2016-08-259588-603-14103.00 ppb
2016-08-259588-604-12005.40 ppb
2016-08-259588-605-12555.10 ppb
2016-08-259588-606-11306.10 ppb
2016-08-259588-607-12406.00 ppb
2016-08-259588-608-11456.00 ppb
2016-12-159588-601-10303.60 ppb
2016-12-159588-602-12205.80 ppb
2016-12-159588-603-0915ND
2016-12-159588-604-10004.60 ppb
2016-12-159588-605-11055.10 ppb
2016-12-159588-606-09404.70 ppb
2016-12-159588-607-10552.80 ppb
2016-12-159588-608-09504.20 ppb
2017-02-169588-001-1010ND
2017-02-169588-017-1040ND
2017-02-239588-601-0925ND
2017-02-239588-602-0850ND
2017-02-239588-603-1300ND
2017-02-239588-604-1040ND
2017-02-239588-605-0910ND
2017-02-239588-606-1125ND
2017-02-239588-607-1020ND
2017-02-239588-608-1100ND
2017-04-199588-009-1030ND
2017-04-199588-010-0945ND
2017-05-269588-601-09508.40 ppb
2017-05-269588-602-08406.60 ppb
2017-05-269588-603-12155.40 ppb
2017-05-269588-604-10156.80 ppb
2017-05-269588-605-09207.40 ppb
2017-05-269588-606-11406.90 ppb
2017-05-269588-607-09356.10 ppb
2017-05-269588-608-10308.60 ppb
2017-08-239588-601-104013.0 ppb
2017-08-239588-602-122014.0 ppb
2017-08-239588-603-0845ND
2017-08-239588-604-095013.0 ppb
2017-08-239588-605-110015.0 ppb
2017-08-239588-606-091513.0 ppb
2017-08-239588-607-101010.00 ppb
2017-08-239588-608-093513.0 ppb
2017-11-159588-601-09308.20 ppb
2017-11-159588-602-104010.00 ppb
2017-11-159588-603-0800ND
2017-11-159588-604-09008.20 ppb
2017-11-159588-605-100510.00 ppb
2017-11-159588-606-08306.50 ppb
2017-11-159588-607-09553.70 ppb
2017-11-159588-608-08458.80 ppb
2018-05-309588-601-134514.0 ppb
2018-05-309588-602-141013.0 ppb
2018-05-309588-603-1055ND
2018-05-309588-604-133013.0 ppb
2018-05-309588-605-102511.0 ppb
2018-05-309588-606-092011.0 ppb
2018-05-309588-607-104013.0 ppb
2018-05-309588-608-100014.0 ppb
2018-08-284790-601-13309.80 ppb
2018-08-284790-602-135514.0 ppb
2018-08-284790-603-0925ND
2018-08-284790-604-13209.50 ppb
2018-08-284790-605-11109.60 ppb
2018-08-284790-606-094510.00 ppb
2018-08-284790-607-11309.80 ppb
2018-08-284790-608-10509.40 ppb
2018-12-214790-601-09453.60 ppb
2018-12-214790-602-09105.20 ppb
2018-12-214790-603-10503.50 ppb
2018-12-214790-604-10054.60 ppb
2018-12-214790-605-09356.80 ppb
2018-12-214790-606-10304.60 ppb
2018-12-214790-607-09553.70 ppb
2018-12-214790-608-10154.70 ppb
2019-02-269588-601-094013.0 ppb
2019-02-269588-602-131018.0 ppb
2019-02-269588-603-11159.90 ppb
2019-02-269588-604-101516.0 ppb
2019-02-269588-605-092029.0 ppb
2019-02-269588-606-105516.0 ppb
2019-02-269588-607-090011.0 ppb
2019-02-269588-608-104014.0 ppb
2019-06-184790-601-12208.20 ppb
2019-06-184790-602-12508.50 ppb
2019-06-184790-603-10307.30 ppb
2019-06-184790-604-13358.40 ppb
2019-06-184790-605-10557.20 ppb
2019-06-184790-606-14005.40 ppb
2019-06-184790-607-10457.20 ppb
2019-06-184790-608-13452.40 ppb
2019-08-284790-601-11209.00 ppb
2019-08-284790-602-10058.50 ppb
2019-08-284790-603-09152.70 ppb
2019-08-284790-604-11358.60 ppb
2019-08-284790-605-10303.40 ppb
2019-08-284790-606-12158.80 ppb
2019-08-284790-607-11058.40 ppb
2019-08-284790-608-11553.90 ppb
2019-11-204790-601-11154.50 ppb
2019-11-204790-602-13004.10 ppb
2019-11-204790-603-10004.40 ppb
2019-11-204790-604-10554.50 ppb
2019-11-204790-605-12154.70 ppb
2019-11-204790-606-10255.10 ppb
2019-11-204790-607-11304.40 ppb
2019-11-204790-608-10405.20 ppb
2019-11-264790-014-0820ND
2019-11-264790-024-10003.40 ppb