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EWG's Tap Water Database — 2021 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.

MORE ABOUT THIS CONTAMINANT

 

158

Samples

0

Samples exceeding legal limit (MCL)

132

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
20154.52 ppb25252.70 ppb - 7.20 ppb
20161.27 ppb3322ND - 5.70 ppb
20172.30 ppb3332ND - 4.60 ppb
20184.77 ppb3325ND - 27.0 ppb
20192.84 ppb3328ND - 11.0 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
2014-02-199588-004-1100ND
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
2018-02-209588-800-11193.10 ppb
2018-02-209588-801-12112.20 ppb
2018-02-209588-802-08551.80 ppb
2018-02-209588-803-09401.30 ppb
2018-02-209588-804-12421.60 ppb
2018-02-209588-805-11064.30 ppb
2018-02-209588-806-11471.60 ppb
2018-02-209588-807-10134.30 ppb
2018-02-219588-004-10142.00 ppb
2018-05-219588-800-083222.0 ppb
2018-05-219588-801-125624.0 ppb
2018-05-219588-802-125422.0 ppb
2018-05-219588-803-12131.000 ppb
2018-05-219588-804-133627.0 ppb
2018-05-219588-805-111525.0 ppb
2018-05-219588-806-12261.70 ppb
2018-05-219588-807-10081.60 ppb
2018-08-209588-800-13411.40 ppb
2018-08-209588-801-12261.20 ppb
2018-08-209588-802-0824ND
2018-08-209588-803-1019ND
2018-08-209588-804-1302ND
2018-08-209588-805-1112ND
2018-08-209588-806-1200ND
2018-08-209588-807-11101.70 ppb
2018-11-199588-800-13552.30 ppb
2018-11-199588-801-13141.20 ppb
2018-11-199588-802-13021.10 ppb
2018-11-199588-803-0825ND
2018-11-199588-804-1220ND
2018-11-199588-805-10591.000 ppb
2018-11-199588-806-1148ND
2018-11-199588-807-10191.000 ppb
2019-02-199588-800-10301.90 ppb
2019-02-199588-801-11473.20 ppb
2019-02-199588-802-08592.80 ppb
2019-02-199588-803-08372.00 ppb
2019-02-199588-804-12282.00 ppb
2019-02-199588-805-10392.10 ppb
2019-02-199588-806-11202.00 ppb
2019-02-199588-807-10411.90 ppb
2019-02-209588-004-09003.30 ppb
2019-05-209588-800-083610.00 ppb
2019-05-209588-801-13129.80 ppb
2019-05-209588-802-124011.0 ppb
2019-05-209588-803-11211.40 ppb
2019-05-209588-804-135511.0 ppb
2019-05-209588-805-114710.00 ppb
2019-05-209588-806-12381.30 ppb
2019-05-209588-807-10061.60 ppb
2019-08-199588-800-08551.50 ppb
2019-08-199588-801-1343ND
2019-08-199588-802-1154ND
2019-08-199588-803-10541.40 ppb
2019-08-199588-804-1424ND
2019-08-199588-805-1220ND
2019-08-199588-806-1314ND
2019-08-199588-807-12261.10 ppb
2019-11-189588-800-08461.60 ppb
2019-11-189588-801-13072.00 ppb
2019-11-189588-802-13001.60 ppb
2019-11-189588-803-11241.20 ppb
2019-11-189588-804-13471.30 ppb
2019-11-189588-805-11511.30 ppb
2019-11-189588-806-12391.30 ppb
2019-11-189588-807-10312.20 ppb