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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Montebello Land & Water Company

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.

 

105

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
2013ND80ND
20140.138 ppb263ND - 1.30 ppb
2015ND190ND
2016ND220ND
2017ND230ND

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
2012-02-212706-001-1340ND
2012-02-212706-007-1350ND
2012-08-202706-003-1130ND
2012-08-202706-004-1215ND
2012-08-202706-005-1140ND
2012-08-202706-008-1225ND
2012-08-202706-009-1200ND
2013-02-252706-001-1000ND
2013-02-252706-007-1010ND
2013-08-122706-003-1240ND
2013-08-122706-004-1220ND
2013-08-122706-005-1230ND
2013-08-122706-008-1210ND
2013-08-122706-009-1255ND
2013-10-229588-803-1015ND
2014-01-149588-800-09351.30 ppb
2014-01-149588-801-09551.10 ppb
2014-01-149588-802-10251.20 ppb
2014-01-219588-800-0900ND
2014-01-219588-801-0920ND
2014-01-219588-802-0945ND
2014-01-219588-803-0845ND
2014-02-202706-001-0955ND
2014-02-202706-007-1020ND
2014-04-229588-800-1045ND
2014-04-229588-801-1025ND
2014-04-229588-802-0930ND
2014-04-229588-803-0955ND
2014-07-159588-800-0945ND
2014-07-159588-801-1000ND
2014-07-159588-802-1030ND
2014-07-159588-803-0920ND
2014-08-222706-003-1015ND
2014-08-222706-004-1000ND
2014-08-222706-005-1035ND
2014-08-222706-008-1100ND
2014-08-222706-009-1145ND
2014-10-219588-800-1105ND
2014-10-219588-801-1045ND
2014-10-219588-802-1010ND
2014-10-219588-803-1030ND
2015-01-209588-800-0915ND
2015-01-209588-801-0900ND
2015-01-209588-802-0820ND
2015-01-209588-803-0840ND
2015-02-192706-001-1145ND
2015-02-192706-007-1205ND
2015-04-219588-800-0910ND
2015-04-219588-801-0855ND
2015-04-219588-802-0815ND
2015-04-219588-803-0830ND
2015-07-219588-800-1005ND
2015-07-219588-801-0945ND
2015-07-219588-802-0845ND
2015-07-219588-803-0905ND
2015-10-209588-800-1110ND
2015-10-209588-801-1055ND
2015-10-209588-802-1005ND
2015-10-209588-803-1025ND
2015-11-242706-004-0950ND
2016-01-199588-800-0915ND
2016-01-199588-801-0900ND
2016-01-199588-802-0830ND
2016-01-199588-803-0845ND
2016-02-249588-007-1020ND
2016-03-119588-001-1015ND
2016-04-199588-800-1105ND
2016-04-199588-801-1045ND
2016-04-199588-802-1005ND
2016-04-199588-803-1025ND
2016-07-199588-800-1030ND
2016-07-199588-801-1010ND
2016-07-199588-802-0925ND
2016-07-199588-803-0950ND
2016-08-259588-003-0845ND
2016-08-259588-005-0820ND
2016-08-259588-008-0835ND
2016-10-189588-800-1045ND
2016-10-189588-801-1025ND
2016-10-189588-802-0935ND
2016-10-189588-803-0955ND
2016-11-229588-004-0850ND
2017-01-319588-800-1315ND
2017-01-319588-801-1300ND
2017-01-319588-802-1225ND
2017-01-319588-803-1240ND
2017-02-219588-001-0900ND
2017-02-219588-007-0925ND
2017-04-189588-800-1020ND
2017-04-189588-801-1000ND
2017-04-189588-802-0910ND
2017-04-189588-803-0930ND
2017-06-149588-009-1025ND
2017-07-189588-800-0935ND
2017-07-189588-801-0915ND
2017-07-189588-802-0840ND
2017-07-189588-803-0855ND
2017-08-309588-003-0905ND
2017-08-309588-005-0915ND
2017-08-309588-008-0850ND
2017-10-139588-004-0855ND
2017-10-179588-800-0930ND
2017-10-179588-801-0910ND
2017-10-179588-802-0830ND
2017-10-179588-803-0845ND