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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Cerritos - City, Water Department

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

 

160

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND60ND
2015ND190ND
2016ND210ND
2017ND380ND
2018ND380ND
20190.112 ppb381ND - 4.26 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
2014-02-142706-002-0900ND
2014-02-142706-003-0920ND
2014-05-222706-002-0855ND
2014-08-212706-001-0948ND
2014-08-212706-002-0936ND
2014-11-202706-002-0920ND
2015-02-122706-001-1200ND
2015-02-122706-003-1250ND
2015-05-154792-800-0900ND
2015-05-154792-801-0916ND
2015-05-154792-802-1000ND
2015-05-154792-803-1020ND
2015-05-154792-804-1115ND
2015-05-154792-805-1056ND
2015-05-154792-806-0931ND
2015-05-154792-807-0830ND
2015-06-302706-002-1400ND
2015-08-174792-800-0905ND
2015-08-174792-801-1302ND
2015-08-174792-802-1005ND
2015-08-174792-803-1028ND
2015-08-174792-804-1145ND
2015-08-174792-805-1105ND
2015-08-174792-806-0915ND
2015-08-174792-807-0835ND
2016-02-164792-800-0925ND
2016-02-164792-801-1215ND
2016-02-164792-802-1006ND
2016-02-164792-803-1028ND
2016-02-164792-804-1121ND
2016-02-164792-805-1100ND
2016-02-164792-806-0955ND
2016-02-164792-807-0830ND
2016-02-259588-001-1115ND
2016-02-259588-003-1140ND
2016-05-164792-800-1303ND
2016-05-164792-801-1222ND
2016-05-164792-802-1100ND
2016-05-164792-803-1120ND
2016-05-164792-804-1200ND
2016-05-164792-805-1135ND
2016-05-164792-806-1247ND
2016-05-164792-807-1323ND
2016-05-259588-002-1340ND
2016-08-299588-002-1200ND
2016-11-289588-002-1130ND
2017-02-174792-800-0926ND
2017-02-174792-801-1019ND
2017-02-174792-802-1146ND
2017-02-174792-803-1117ND
2017-02-174792-804-1031ND
2017-02-174792-805-1103ND
2017-02-174792-806-1230ND
2017-02-174792-807-1320ND
2017-02-239588-001-1040ND
2017-02-239588-002-1100ND
2017-02-239588-003-1115ND
2017-05-164792-800-0820ND
2017-05-164792-801-1205ND
2017-05-164792-802-1035ND
2017-05-164792-803-0950ND
2017-05-164792-804-0920ND
2017-05-164792-805-0940ND
2017-05-164792-806-1138ND
2017-05-164792-807-0752ND
2017-05-249588-002-1110ND
2017-08-174792-800-0830ND
2017-08-174792-801-1210ND
2017-08-174792-802-1331ND
2017-08-174792-803-1300ND
2017-08-174792-804-1224ND
2017-08-174792-805-1250ND
2017-08-174792-806-1145ND
2017-08-174792-807-0755ND
2017-08-249588-002-1145ND
2017-10-199588-002-1205ND
2017-11-174792-800-0815ND
2017-11-174792-801-1021ND
2017-11-174792-802-0900ND
2017-11-174792-803-0920ND
2017-11-174792-804-1000ND
2017-11-174792-805-0840ND
2017-11-174792-806-0830ND
2017-11-174792-807-0803ND
2018-02-154792-800-1050ND
2018-02-154792-801-1115ND
2018-02-154792-802-1219ND
2018-02-154792-803-1208ND
2018-02-154792-804-1149ND
2018-02-154792-805-1228ND
2018-02-154792-806-1245ND
2018-02-154792-807-1035ND
2018-02-229588-001-1110ND
2018-02-229588-002-1210ND
2018-02-229588-003-1130ND
2018-05-214792-800-0912ND
2018-05-214792-801-0948ND
2018-05-214792-802-1208ND
2018-05-214792-803-1135ND
2018-05-214792-804-1015ND
2018-05-214792-805-1117ND
2018-05-214792-806-1246ND
2018-05-214792-807-0840ND
2018-05-249588-002-1215ND
2018-08-159588-002-0810ND
2018-08-164792-800-0916ND
2018-08-164792-801-1019ND
2018-08-164792-802-1230ND
2018-08-164792-803-1202ND
2018-08-164792-804-1040ND
2018-08-164792-805-1139ND
2018-08-164792-806-1319ND
2018-08-164792-807-0837ND
2018-11-154792-800-0917ND
2018-11-154792-801-0735ND
2018-11-154792-802-1246ND
2018-11-154792-803-0940ND
2018-11-154792-804-0940ND
2018-11-154792-805-1200ND
2018-11-154792-806-1110ND
2018-11-154792-807-0824ND
2018-11-279588-002-0820ND
2019-02-139588-001-0755ND
2019-02-139588-002-1005ND
2019-02-139588-003-0835ND
2019-02-214792-800-0935ND
2019-02-214792-801-1025ND
2019-02-214792-802-1230ND
2019-02-214792-803-1200ND
2019-02-214792-804-1057ND
2019-02-214792-805-11504.26 ppb
2019-02-214792-806-1242ND
2019-02-214792-807-0805ND
2019-05-164792-800-0916ND
2019-05-164792-801-0955ND
2019-05-164792-802-1214ND
2019-05-164792-803-1109ND
2019-05-164792-804-1008ND
2019-05-164792-805-1057ND
2019-05-164792-806-1202ND
2019-05-164792-807-0852ND
2019-05-239588-002-0930ND
2019-08-089588-002-0945ND
2019-08-154792-800-0854ND
2019-08-154792-801-0925ND
2019-08-154792-802-1135ND
2019-08-154792-803-1110ND
2019-08-154792-804-0935ND
2019-08-154792-805-1044ND
2019-08-154792-806-1225ND
2019-08-154792-807-0809ND
2019-11-079588-002-0935ND
2019-11-144792-800-1003ND
2019-11-144792-801-1303ND
2019-11-144792-802-1237ND
2019-11-144792-803-1217ND
2019-11-144792-804-1115ND
2019-11-144792-805-1208ND
2019-11-144792-806-1225ND
2019-11-144792-807-1337ND