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EWG's Tap Water Database — 2021 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.

MORE ABOUT THIS CONTAMINANT

 

133

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.138 ppb263ND - 1.30 ppb
2015ND190ND
2016ND220ND
2017ND230ND
20180.0417 ppb241ND - 1.000 ppb
2019ND190ND

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
2014-01-149588-800-09351.30 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
2018-02-169588-001-0900ND
2018-02-219588-800-0930ND
2018-02-219588-801-0950ND
2018-02-219588-802-1000ND
2018-02-219588-803-0900ND
2018-03-299588-007-08451.000 ppb
2018-05-019588-800-0930ND
2018-05-019588-801-0920ND
2018-05-019588-802-0840ND
2018-05-019588-803-0900ND
2018-05-299588-007-0915ND
2018-05-299588-009-0930ND
2018-07-179588-800-1020ND
2018-07-179588-801-1000ND
2018-07-179588-802-0915ND
2018-07-179588-803-0935ND
2018-08-159588-003-1200ND
2018-08-159588-005-1130ND
2018-08-159588-008-1150ND
2018-10-169588-800-1020ND
2018-10-169588-801-1005ND
2018-10-169588-802-0915ND
2018-10-169588-803-0935ND
2018-11-149588-004-0900ND
2019-01-259588-800-0815ND
2019-01-259588-801-0845ND
2019-01-259588-802-0850ND
2019-01-259588-803-0900ND
2019-02-219588-003-0830ND
2019-02-219588-005-0850ND
2019-02-219588-007-0915ND
2019-02-219588-008-0835ND
2019-02-219588-009-0930ND
2019-02-289588-001-1015ND
2019-04-169588-800-0955ND
2019-04-169588-801-0940ND
2019-04-169588-802-0855ND
2019-04-169588-803-0915ND
2019-05-029588-004-0815ND
2019-07-169588-800-0925ND
2019-07-169588-801-0910ND
2019-07-169588-802-0835ND
2019-07-169588-803-0850ND