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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Las Virgenes Municipal Water District

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.

 

126

Samples

0

Samples exceeding legal limit (MCL)

99

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.61 ppb2518ND - 5.60 ppb
20130.300 ppb92ND - 1.40 ppb
2014ND10ND
20154.52 ppb25252.70 ppb - 7.20 ppb
20161.27 ppb3322ND - 5.70 ppb
20172.30 ppb3332ND - 4.60 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
2012-02-149590-004-12053.00 ppb
2012-05-149590-800-13201.60 ppb
2012-05-149590-801-12171.10 ppb
2012-05-149590-802-13201.10 ppb
2012-05-149590-803-12171.000 ppb
2012-05-149590-804-1247ND
2012-05-149590-805-1105ND
2012-05-149590-806-1023ND
2012-05-149590-807-10251.30 ppb
2012-08-069590-800-08555.60 ppb
2012-08-069590-801-10254.60 ppb
2012-08-069590-802-14454.50 ppb
2012-08-069590-803-0935ND
2012-08-069590-804-0945ND
2012-08-069590-805-11454.00 ppb
2012-08-069590-806-1055ND
2012-08-069590-807-1143ND
2012-11-129590-800-14201.80 ppb
2012-11-129590-801-13002.30 ppb
2012-11-129590-802-14201.30 ppb
2012-11-129590-803-09101.10 ppb
2012-11-129590-804-13291.000 ppb
2012-11-129590-805-11571.90 ppb
2012-11-129590-806-12341.70 ppb
2012-11-129590-807-11151.30 ppb
2013-02-049590-800-13131.40 ppb
2013-02-049590-801-1200ND
2013-02-049590-803-0910ND
2013-02-049590-804-1230ND
2013-02-049590-805-1135ND
2013-02-049590-806-1055ND
2013-02-049590-807-10551.30 ppb
2013-02-149590-802-1200ND
2013-02-269590-004-1040ND
2014-02-199588-004-1100ND
2015-02-189588-004-10052.70 ppb
2015-05-189588-800-11474.60 ppb
2015-05-189588-801-11375.70 ppb
2015-05-189588-802-10305.30 ppb
2015-05-189588-803-09506.00 ppb
2015-05-189588-804-12184.90 ppb
2015-05-189588-805-10255.10 ppb
2015-05-189588-806-11106.50 ppb
2015-05-189588-807-09165.40 ppb
2015-08-179588-805-09506.40 ppb
2015-08-179588-806-10334.60 ppb
2015-08-189588-800-08113.30 ppb
2015-08-189588-801-10554.50 ppb
2015-08-189588-802-12494.60 ppb
2015-08-189588-803-12186.30 ppb
2015-08-189588-804-11257.20 ppb
2015-08-189588-807-10273.40 ppb
2015-11-169588-800-08083.80 ppb
2015-11-169588-801-11383.60 ppb
2015-11-169588-802-11433.40 ppb
2015-11-169588-803-10213.00 ppb
2015-11-169588-804-12083.50 ppb
2015-11-169588-805-10323.20 ppb
2015-11-169588-806-11152.70 ppb
2015-11-169588-807-08593.40 ppb
2016-02-169588-800-08245.70 ppb
2016-02-169588-801-12012.60 ppb
2016-02-169588-802-13452.40 ppb
2016-02-169588-803-1311ND
2016-02-169588-804-12331.10 ppb
2016-02-169588-805-10541.40 ppb
2016-02-169588-806-11331.40 ppb
2016-02-169588-807-11271.60 ppb
2016-02-179588-004-09421.40 ppb
2016-05-169588-800-1056ND
2016-05-169588-801-1158ND
2016-05-169588-802-0905ND
2016-05-169588-803-0822ND
2016-05-169588-804-1226ND
2016-05-169588-805-1053ND
2016-05-169588-806-1135ND
2016-05-179588-807-0919ND
2016-08-159588-800-0900ND
2016-08-159588-801-13151.20 ppb
2016-08-159588-802-13131.20 ppb
2016-08-159588-803-12341.30 ppb
2016-08-159588-804-13501.30 ppb
2016-08-159588-805-11521.50 ppb
2016-08-159588-806-12401.30 ppb
2016-08-159588-807-0956ND
2016-11-219588-800-13082.00 ppb
2016-11-219588-801-11541.90 ppb
2016-11-219588-802-13052.00 ppb
2016-11-219588-803-08452.10 ppb
2016-11-219588-804-12301.80 ppb
2016-11-219588-805-10442.30 ppb
2016-11-219588-806-11292.00 ppb
2016-11-219588-807-10362.30 ppb
2017-02-219588-800-11201.60 ppb
2017-02-219588-801-13391.50 ppb
2017-02-219588-802-09411.70 ppb
2017-02-219588-803-09141.000 ppb
2017-02-219588-804-14131.000 ppb
2017-02-219588-805-12201.10 ppb
2017-02-219588-806-13111.10 ppb
2017-02-219588-807-10202.20 ppb
2017-02-229588-004-09321.40 ppb
2017-05-169588-800-11123.10 ppb
2017-05-169588-801-12571.90 ppb
2017-05-169588-802-09191.70 ppb
2017-05-169588-803-0852ND
2017-05-169588-804-13322.00 ppb
2017-05-169588-805-11472.60 ppb
2017-05-169588-806-12292.00 ppb
2017-05-169588-807-11041.70 ppb
2017-08-219588-800-08292.80 ppb
2017-08-219588-801-12123.30 ppb
2017-08-219588-802-08574.40 ppb
2017-08-219588-803-11392.80 ppb
2017-08-219588-804-12404.60 ppb
2017-08-219588-805-11064.40 ppb
2017-08-219588-806-23484.50 ppb
2017-08-219588-807-13343.70 ppb
2017-11-209588-800-09052.20 ppb
2017-11-209588-801-13172.40 ppb
2017-11-209588-802-13302.50 ppb
2017-11-209588-803-08441.80 ppb
2017-11-209588-804-13532.10 ppb
2017-11-209588-805-12022.80 ppb
2017-11-209588-806-12512.00 ppb
2017-11-209588-807-09002.00 ppb