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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Liberty Utilities - Bellflower - Norwalk

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

 

214

Samples

0

Samples exceeding legal limit (MCL)

89

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20147.94 ppb3631ND - 16.0 ppb
20155.00 ppb2819ND - 13.0 ppb
20161.92 ppb3719ND - 6.30 ppb
20172.09 ppb3913ND - 30.0 ppb
20180.319 ppb323ND - 4.20 ppb
20190.433 ppb424ND - 5.60 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
2014-01-169588-800-120513.0 ppb
2014-01-169588-801-11514.20 ppb
2014-01-169588-802-122412.0 ppb
2014-01-169588-803-13458.50 ppb
2014-01-169588-804-140412.0 ppb
2014-01-169588-805-13289.90 ppb
2014-01-169588-806-13173.40 ppb
2014-01-169588-807-12414.70 ppb
2014-04-179588-016-0715ND
2014-04-179588-025-0730ND
2014-04-179588-026-1325ND
2014-04-179588-031-1300ND
2014-04-179588-800-1041ND
2014-04-179588-801-10556.00 ppb
2014-04-179588-802-111411.0 ppb
2014-04-179588-803-11309.30 ppb
2014-04-179588-804-114010.00 ppb
2014-04-179588-805-11559.80 ppb
2014-04-179588-806-12054.50 ppb
2014-04-179588-807-122011.0 ppb
2014-07-109588-800-114011.0 ppb
2014-07-109588-801-115012.0 ppb
2014-07-109588-802-12055.10 ppb
2014-07-109588-803-14056.30 ppb
2014-07-109588-804-135012.0 ppb
2014-07-109588-805-13356.80 ppb
2014-07-109588-806-13252.90 ppb
2014-07-109588-807-13001.60 ppb
2014-10-169588-800-104016.0 ppb
2014-10-169588-801-110013.0 ppb
2014-10-169588-802-112012.0 ppb
2014-10-169588-803-113512.0 ppb
2014-10-169588-804-120011.0 ppb
2014-10-169588-805-121512.0 ppb
2014-10-169588-806-123010.00 ppb
2014-10-169588-807-124513.0 ppb
2015-01-229588-800-1125ND
2015-01-229588-801-12019.00 ppb
2015-01-229588-802-12207.80 ppb
2015-01-229588-803-13304.20 ppb
2015-01-229588-804-13557.40 ppb
2015-01-229588-805-13157.30 ppb
2015-01-229588-806-12553.90 ppb
2015-01-229588-807-12408.00 ppb
2015-04-099588-026-1325ND
2015-04-169588-025-0945ND
2015-04-179588-800-0839ND
2015-04-179588-800-0850ND
2015-04-179588-802-090512.0 ppb
2015-04-179588-803-09253.80 ppb
2015-04-179588-804-094510.00 ppb
2015-04-179588-805-100512.0 ppb
2015-04-179588-806-102512.0 ppb
2015-04-179588-807-105513.0 ppb
2015-05-079588-016-1235ND
2015-05-219588-031-0915ND
2015-07-139588-800-1350ND
2015-07-139588-800-14081.30 ppb
2015-07-139588-802-1422ND
2015-07-139588-803-14456.00 ppb
2015-07-139588-804-150511.0 ppb
2015-07-139588-805-15224.30 ppb
2015-07-139588-806-15303.70 ppb
2015-07-139588-807-15453.30 ppb
2016-02-049588-800-12355.00 ppb
2016-02-049588-801-12205.00 ppb
2016-02-049588-802-12552.80 ppb
2016-02-049588-803-14152.00 ppb
2016-02-049588-804-14394.40 ppb
2016-02-049588-805-13552.70 ppb
2016-02-049588-806-13402.90 ppb
2016-02-049588-807-13152.60 ppb
2016-04-229588-800-1010ND
2016-04-229588-801-0950ND
2016-04-229588-802-1250ND
2016-04-229588-803-1425ND
2016-04-229588-804-14104.20 ppb
2016-04-229588-805-1345ND
2016-04-229588-806-1330ND
2016-04-229588-807-1319ND
2016-05-129588-025-1125ND
2016-05-129588-031-1220ND
2016-05-199588-026-1435ND
2016-07-289588-800-1140ND
2016-07-289588-801-1125ND
2016-07-289588-802-11502.60 ppb
2016-07-289588-803-13152.70 ppb
2016-07-289588-804-13003.60 ppb
2016-07-289588-805-12401.90 ppb
2016-07-289588-806-12352.00 ppb
2016-07-289588-807-1220ND
2016-10-279588-800-1315ND
2016-10-279588-801-13003.80 ppb
2016-10-279588-802-13295.80 ppb
2016-10-279588-803-1410ND
2016-10-279588-804-14286.30 ppb
2016-10-279588-805-14505.70 ppb
2016-10-279588-806-15005.00 ppb
2016-10-279588-807-1515ND
2016-12-089588-016-1130ND
2016-12-289469-031-0930ND
2017-01-139588-800-1230ND
2017-01-139588-801-1247ND
2017-01-139588-802-12155.90 ppb
2017-01-139588-803-13556.00 ppb
2017-01-139588-804-14155.70 ppb
2017-01-139588-805-13356.40 ppb
2017-01-139588-806-13256.50 ppb
2017-01-139588-807-13086.40 ppb
2017-02-249588-031-0930ND
2017-04-069588-025-1000ND
2017-04-139588-800-1436ND
2017-04-139588-801-1059ND
2017-04-139588-802-0752ND
2017-04-139588-803-1250ND
2017-04-139588-804-130930.0 ppb
2017-04-139588-805-1330ND
2017-04-139588-806-1346ND
2017-04-139588-807-1409ND
2017-04-179588-016-1300ND
2017-04-289588-026-1145ND
2017-05-089588-031-1130ND
2017-07-209588-800-1203ND
2017-07-209588-801-1225ND
2017-07-209588-802-1240ND
2017-07-209588-803-1355ND
2017-07-209588-804-13401.20 ppb
2017-07-209588-805-1320ND
2017-07-209588-806-13061.000 ppb
2017-07-209588-807-1255ND
2017-08-039588-031-0840ND
2017-10-129588-800-1250ND
2017-10-129588-801-1225ND
2017-10-129588-802-1300ND
2017-10-129588-803-1335ND
2017-10-129588-804-14004.90 ppb
2017-10-129588-805-14201.90 ppb
2017-10-129588-806-14301.20 ppb
2017-10-129588-807-14554.30 ppb
2017-12-159588-031-1030ND
2018-01-189588-800-1230ND
2018-01-189588-801-1250ND
2018-01-189588-802-1335ND
2018-01-189588-803-1440ND
2018-01-189588-804-14202.70 ppb
2018-01-189588-805-1400ND
2018-01-189588-806-1345ND
2018-01-189588-807-1310ND
2018-02-229588-031-0815ND
2018-04-059588-025-0830ND
2018-04-099588-016-0800ND
2018-04-099588-026-0730ND
2018-04-269588-800-1100ND
2018-04-269588-801-1115ND
2018-04-269588-802-1130ND
2018-04-269588-803-1145ND
2018-04-269588-804-12504.20 ppb
2018-04-269588-805-1525ND
2018-04-269588-806-1510ND
2018-04-269588-807-1454ND
2018-05-119588-031-1110ND
2018-08-169588-031-0800ND
2018-09-139588-026-0945ND
2018-10-119588-800-1150ND
2018-10-119588-801-1255ND
2018-10-119588-802-1235ND
2018-10-119588-803-1415ND
2018-10-119588-804-14053.30 ppb
2018-10-119588-805-1350ND
2018-10-119588-806-1335ND
2018-10-119588-807-1315ND
2018-11-089588-031-1150ND
2019-01-089588-031-1340ND
2019-01-089588-800-1442ND
2019-01-089588-801-0825ND
2019-01-089588-802-0737ND
2019-01-089588-803-1335ND
2019-01-089588-804-13215.20 ppb
2019-01-089588-805-1123ND
2019-01-089588-806-1105ND
2019-01-089588-807-0932ND
2019-03-129588-016-0910ND
2019-04-099588-800-1315ND
2019-04-099588-801-1300ND
2019-04-099588-802-1330ND
2019-04-099588-803-1430ND
2019-04-099588-804-15005.60 ppb
2019-04-099588-805-1415ND
2019-04-099588-806-1400ND
2019-04-099588-807-1345ND
2019-04-109588-016-0930ND
2019-04-109588-025-0000ND
2019-04-109588-026-0000ND
2019-04-109588-031-1315ND
2019-07-029588-016-0900ND
2019-07-029588-031-0955ND
2019-07-109588-800-0757ND
2019-07-109588-801-0816ND
2019-07-109588-802-0740ND
2019-07-109588-803-1015ND
2019-07-109588-804-09553.70 ppb
2019-07-109588-805-0925ND
2019-07-109588-806-0905ND
2019-07-109588-807-0836ND
2019-10-089588-016-1120ND
2019-10-089588-031-1156ND
2019-10-089588-800-1250ND
2019-10-089588-801-1310ND
2019-10-089588-802-1455ND
2019-10-089588-803-1440ND
2019-10-089588-804-14253.70 ppb
2019-10-089588-805-1340ND
2019-10-089588-806-1400ND
2019-10-089588-807-1325ND