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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Sunny Slope 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

 

126

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND200ND
20150.0619 ppb211ND - 1.30 ppb
2016ND210ND
2017ND210ND
20180.0455 ppb221ND - 1.000 ppb
20190.162 ppb211ND - 3.40 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
2014-01-319588-800-1250ND
2014-01-319588-801-1155ND
2014-01-319588-802-1225ND
2014-01-319588-803-1210ND
2014-03-039588-004-0930ND
2014-04-309588-800-1015ND
2014-04-309588-801-1030ND
2014-04-309588-802-1005ND
2014-04-309588-803-1045ND
2014-06-039588-012-0940ND
2014-07-319588-800-0915ND
2014-07-319588-801-0900ND
2014-07-319588-802-0930ND
2014-07-319588-803-0850ND
2014-09-169588-003-0925ND
2014-10-319588-800-1135ND
2014-10-319588-801-1115ND
2014-10-319588-802-1155ND
2014-10-319588-803-1105ND
2014-12-019588-006-0910ND
2015-01-299588-800-0940ND
2015-01-299588-801-0915ND
2015-01-299588-802-0940ND
2015-01-299588-803-0925ND
2015-03-199588-004-0910ND
2015-04-309588-800-0825ND
2015-04-309588-801-08401.30 ppb
2015-04-309588-802-0815ND
2015-04-309588-803-0850ND
2015-06-099588-012-1025ND
2015-06-099588-017-1010ND
2015-07-319588-800-1045ND
2015-07-319588-801-1020ND
2015-07-319588-802-1100ND
2015-07-319588-803-1030ND
2015-09-029588-003-0935ND
2015-10-299588-800-1200ND
2015-10-299588-801-1135ND
2015-10-299588-802-1215ND
2015-10-299588-803-1145ND
2015-12-099588-006-0910ND
2016-01-289588-800-1120ND
2016-01-289588-801-1055ND
2016-01-289588-802-1135ND
2016-01-289588-803-1105ND
2016-03-109588-004-0915ND
2016-04-289588-800-1100ND
2016-04-289588-801-1040ND
2016-04-289588-802-1115ND
2016-04-289588-803-1050ND
2016-06-089588-012-1005ND
2016-06-089588-017-1030ND
2016-07-289588-800-0945ND
2016-07-289588-801-0915ND
2016-07-289588-802-1000ND
2016-07-289588-803-0930ND
2016-09-129588-003-0930ND
2016-10-289588-800-1050ND
2016-10-289588-801-1035ND
2016-10-289588-802-1110ND
2016-10-289588-803-1025ND
2016-12-029588-006-1040ND
2017-01-309588-800-1040ND
2017-01-309588-801-1030ND
2017-01-309588-802-1050ND
2017-01-309588-803-1015ND
2017-03-069588-004-1040ND
2017-04-289588-800-1050ND
2017-04-289588-801-1015ND
2017-04-289588-802-1105ND
2017-04-289588-803-1030ND
2017-06-309588-012-1310ND
2017-06-309588-017-1335ND
2017-07-319588-800-1120ND
2017-07-319588-801-1150ND
2017-07-319588-802-1110ND
2017-07-319588-803-1140ND
2017-09-219588-003-0930ND
2017-10-319588-800-1100ND
2017-10-319588-801-1025ND
2017-10-319588-802-1120ND
2017-10-319588-803-1035ND
2017-12-289588-006-0835ND
2018-01-319588-800-1110ND
2018-01-319588-801-1040ND
2018-01-319588-802-1125ND
2018-01-319588-803-1055ND
2018-03-209588-004-0945ND
2018-04-109588-003-0930ND
2018-04-279588-800-1110ND
2018-04-279588-801-09151.000 ppb
2018-04-279588-802-1055ND
2018-04-279588-803-0925ND
2018-06-129588-012-0955ND
2018-06-129588-017-0930ND
2018-07-309588-800-1105ND
2018-07-309588-801-1050ND
2018-07-309588-802-1115ND
2018-07-309588-803-1040ND
2018-09-119588-003-0925ND
2018-10-309588-800-1100ND
2018-10-309588-801-1035ND
2018-10-309588-802-1115ND
2018-10-309588-803-1045ND
2018-12-139588-006-0915ND
2019-01-299588-800-1115ND
2019-01-299588-801-1045ND
2019-01-299588-802-1130ND
2019-01-299588-803-1100ND
2019-04-299588-800-1105ND
2019-04-299588-801-1040ND
2019-04-299588-802-1115ND
2019-04-299588-803-1050ND
2019-06-049588-004-1105ND
2019-06-049588-012-1045ND
2019-06-049588-017-1055ND
2019-07-299588-800-1030ND
2019-07-299588-801-1005ND
2019-07-299588-802-1045ND
2019-07-299588-803-1015ND
2019-09-179588-003-0915ND
2019-10-299588-800-1045ND
2019-10-299588-801-1015ND
2019-10-299588-802-11053.40 ppb
2019-10-299588-803-1030ND
2019-12-139588-006-0915ND