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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Cal-am Water Company - Duarte

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.

 

150

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
2013ND230ND
20140.113 ppb303ND - 1.20 ppb
20150.113 ppb303ND - 1.20 ppb
2016ND310ND
20170.0458 ppb241ND - 1.10 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
2012-03-159588-004-1045ND
2012-03-299588-019-1110ND
2012-08-081225-019-1150ND
2012-09-189588-002-1200ND
2012-09-189588-003-1245ND
2012-09-189588-007-1310ND
2012-09-189588-008-1215ND
2012-09-189588-010-1145ND
2012-09-189588-019-1325ND
2012-09-261225-019-0840ND
2012-12-049588-009-1225ND
2012-12-049588-019-1115ND
2013-02-041225-019-0905ND
2013-03-069588-004-1105ND
2013-07-311225-019-1150ND
2013-09-109588-002-1400ND
2013-09-109588-003-1215ND
2013-09-109588-007-1200ND
2013-09-109588-008-1335ND
2013-09-109588-010-1420ND
2013-09-181225-003-1010ND
2013-09-181225-004-1045ND
2013-09-181225-007-0950ND
2013-09-181225-009-1025ND
2013-09-181225-010-1150ND
2013-09-181225-019-0850ND
2013-10-091225-002-1055ND
2013-10-091225-008-1020ND
2013-10-319588-800-1040ND
2013-10-319588-801-1015ND
2013-10-319588-802-1025ND
2013-10-319588-803-0830ND
2013-12-049588-009-1105ND
2013-12-049588-019-1000ND
2013-12-181225-019-1120ND
2014-01-319588-800-0755ND
2014-01-319588-801-08201.10 ppb
2014-01-319588-802-0810ND
2014-01-319588-803-07401.10 ppb
2014-03-109588-004-1140ND
2014-04-309588-800-09101.20 ppb
2014-04-309588-801-0935ND
2014-04-309588-802-0925ND
2014-04-309588-803-0800ND
2014-06-231225-002-1300ND
2014-06-231225-003-1110ND
2014-06-231225-007-1040ND
2014-06-231225-008-1235ND
2014-06-231225-009-1135ND
2014-06-231225-010-1330ND
2014-07-319588-800-1145ND
2014-07-319588-801-1200ND
2014-07-319588-802-1210ND
2014-07-319588-803-1125ND
2014-09-039588-002-1055ND
2014-09-039588-003-1215ND
2014-09-039588-007-1240ND
2014-09-039588-008-1120ND
2014-09-039588-010-1225ND
2014-10-319588-800-0935ND
2014-10-319588-801-0955ND
2014-10-319588-802-0945ND
2014-10-319588-803-1030ND
2014-12-039588-009-1100ND
2014-12-039588-019-1020ND
2015-01-299588-800-0820ND
2015-01-299588-801-0840ND
2015-01-299588-802-0830ND
2015-01-299588-803-07301.20 ppb
2015-04-309588-800-0750ND
2015-04-309588-801-0730ND
2015-04-309588-802-0740ND
2015-04-309588-803-1045ND
2015-07-319588-800-08301.10 ppb
2015-07-319588-801-0850ND
2015-07-319588-802-0840ND
2015-07-319588-803-0730ND
2015-09-089588-002-1200ND
2015-09-089588-003-1140ND
2015-09-089588-007-1215ND
2015-09-089588-008-1120ND
2015-09-089588-010-1110ND
2015-09-281225-003-1050ND
2015-09-281225-007-1200ND
2015-09-281225-008-1330ND
2015-09-281225-009-1345ND
2015-09-281225-010-0945ND
2015-10-141225-002-1205ND
2015-10-141225-019-0945ND
2015-10-299588-800-0840ND
2015-10-299588-801-0900ND
2015-10-299588-802-0850ND
2015-10-299588-803-07301.10 ppb
2015-12-079588-009-1130ND
2015-12-079588-019-1040ND
2016-01-289588-800-0840ND
2016-01-289588-801-0900ND
2016-01-289588-802-0850ND
2016-01-289588-803-0740ND
2016-04-289588-800-0850ND
2016-04-289588-801-0915ND
2016-04-289588-802-0905ND
2016-04-289588-803-0755ND
2016-06-201225-008-1145ND
2016-06-201225-010-1135ND
2016-06-201225-019-1115ND
2016-07-201225-002-1110ND
2016-07-201225-003-1000ND
2016-07-201225-007-0930ND
2016-07-201225-009-1030ND
2016-07-289588-800-0840ND
2016-07-289588-801-0900ND
2016-07-289588-802-0840ND
2016-07-289588-803-0730ND
2016-09-079588-002-1330ND
2016-09-079588-003-1305ND
2016-09-079588-007-1245ND
2016-09-079588-008-1345ND
2016-09-079588-010-1315ND
2016-09-121225-019-0850ND
2016-10-289588-800-0835ND
2016-10-289588-801-0855ND
2016-10-289588-802-0845ND
2016-10-289588-803-0735ND
2016-12-059588-009-1135ND
2016-12-059588-019-1105ND
2017-01-309588-800-0830ND
2017-01-309588-801-0850ND
2017-01-309588-802-0840ND
2017-01-309588-803-0730ND
2017-04-289588-800-0840ND
2017-04-289588-801-0900ND
2017-04-289588-802-0850ND
2017-04-289588-803-0730ND
2017-07-251225-009-1210ND
2017-07-319588-800-1605ND
2017-07-319588-801-1535ND
2017-07-319588-802-1550ND
2017-07-319588-803-1515ND
2017-09-209588-002-1150ND
2017-09-209588-007-1100ND
2017-09-209588-008-1125ND
2017-09-209588-010-1210ND
2017-09-289588-003-0905ND
2017-10-319588-800-0855ND
2017-10-319588-801-0925ND
2017-10-319588-802-0905ND
2017-10-319588-803-07401.10 ppb
2017-12-059588-009-1030ND
2017-12-059588-019-1000ND