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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Alhambra

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

 

216

Samples

0

Samples exceeding legal limit (MCL)

191

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201411.6 ppb3632ND - 25.0 ppb
201510.1 ppb3632ND - 26.0 ppb
20169.23 ppb3632ND - 19.0 ppb
201711.2 ppb3632ND - 27.0 ppb
20182.95 ppb3631ND - 5.30 ppb
20193.50 ppb3632ND - 6.30 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
2014-03-179588-800-093011.0 ppb
2014-03-179588-801-09209.30 ppb
2014-03-179588-802-090011.0 ppb
2014-03-179588-803-08509.00 ppb
2014-03-179588-804-09109.40 ppb
2014-03-179588-805-094011.0 ppb
2014-03-179588-806-08202.70 ppb
2014-03-179588-807-08408.60 ppb
2014-06-199588-800-115519.0 ppb
2014-06-199588-801-114025.0 ppb
2014-06-199588-802-111518.0 ppb
2014-06-199588-803-110518.0 ppb
2014-06-199588-804-112515.0 ppb
2014-06-199588-805-121019.0 ppb
2014-06-199588-806-104011.0 ppb
2014-06-199588-807-105522.0 ppb
2014-07-089588-007-0905ND
2014-07-089588-011-0915ND
2014-07-089588-013-0940ND
2014-09-159588-800-105020.0 ppb
2014-09-159588-801-104014.0 ppb
2014-09-159588-802-102518.0 ppb
2014-09-159588-803-101514.0 ppb
2014-09-159588-804-103019.0 ppb
2014-09-159588-805-110519.0 ppb
2014-09-159588-806-09406.30 ppb
2014-09-159588-807-100014.0 ppb
2014-10-019588-014-1130ND
2014-12-169588-800-08458.20 ppb
2014-12-169588-801-08359.70 ppb
2014-12-169588-802-081011.0 ppb
2014-12-169588-803-075511.0 ppb
2014-12-169588-804-08208.30 ppb
2014-12-169588-805-090013.0 ppb
2014-12-169588-806-07305.40 ppb
2014-12-169588-807-07456.10 ppb
2015-03-169588-800-10556.30 ppb
2015-03-169588-801-10456.10 ppb
2015-03-169588-802-10259.50 ppb
2015-03-169588-803-10106.10 ppb
2015-03-169588-804-10354.60 ppb
2015-03-169588-805-11108.80 ppb
2015-03-169588-806-09304.90 ppb
2015-03-169588-807-09505.80 ppb
2015-06-159588-800-093014.0 ppb
2015-06-159588-801-091512.0 ppb
2015-06-159588-802-084511.0 ppb
2015-06-159588-803-083511.0 ppb
2015-06-159588-804-090010.00 ppb
2015-06-159588-805-094015.0 ppb
2015-06-159588-806-08009.20 ppb
2015-06-159588-807-082014.0 ppb
2015-07-079588-007-0900ND
2015-07-079588-011-0925ND
2015-09-169588-800-094526.0 ppb
2015-09-169588-801-093519.0 ppb
2015-09-169588-802-091019.0 ppb
2015-09-169588-803-090517.0 ppb
2015-09-169588-804-092515.0 ppb
2015-09-169588-805-100019.0 ppb
2015-09-169588-806-083010.00 ppb
2015-09-169588-807-085021.0 ppb
2015-09-239588-013-0930ND
2015-10-089588-014-1115ND
2015-12-159588-800-093512.0 ppb
2015-12-159588-801-09259.00 ppb
2015-12-159588-802-09109.70 ppb
2015-12-159588-803-09008.20 ppb
2015-12-159588-804-09156.20 ppb
2015-12-159588-805-09459.70 ppb
2015-12-159588-806-08354.00 ppb
2015-12-159588-807-08509.30 ppb
2016-03-219588-800-10107.10 ppb
2016-03-219588-801-10007.70 ppb
2016-03-219588-802-09409.00 ppb
2016-03-219588-803-09358.00 ppb
2016-03-219588-804-09509.50 ppb
2016-03-219588-805-10208.60 ppb
2016-03-219588-806-09103.80 ppb
2016-03-219588-807-092512.0 ppb
2016-06-219588-800-090510.00 ppb
2016-06-219588-801-085512.0 ppb
2016-06-219588-802-08359.20 ppb
2016-06-219588-803-082511.0 ppb
2016-06-219588-804-08459.20 ppb
2016-06-219588-805-091512.0 ppb
2016-06-219588-806-08004.00 ppb
2016-06-219588-807-081011.0 ppb
2016-07-129588-007-0850ND
2016-07-129588-011-1035ND
2016-07-129588-013-1010ND
2016-09-229588-800-100517.0 ppb
2016-09-229588-801-095015.0 ppb
2016-09-229588-802-092019.0 ppb
2016-09-229588-803-090516.0 ppb
2016-09-229588-804-093512.0 ppb
2016-09-229588-805-101514.0 ppb
2016-09-229588-806-08309.10 ppb
2016-09-229588-807-085014.0 ppb
2016-10-069588-014-1120ND
2016-12-199588-800-10509.10 ppb
2016-12-199588-801-10408.70 ppb
2016-12-199588-802-101513.0 ppb
2016-12-199588-803-100511.0 ppb
2016-12-199588-804-10307.60 ppb
2016-12-199588-805-11058.80 ppb
2016-12-199588-806-09405.60 ppb
2016-12-199588-807-09558.40 ppb
2017-03-209588-800-100025.0 ppb
2017-03-209588-801-094525.0 ppb
2017-03-209588-802-091525.0 ppb
2017-03-209588-803-090027.0 ppb
2017-03-209588-804-093018.0 ppb
2017-03-209588-805-103518.0 ppb
2017-03-209588-806-08257.90 ppb
2017-03-209588-807-084525.0 ppb
2017-06-209588-800-101014.0 ppb
2017-06-209588-801-112514.0 ppb
2017-06-209588-802-105515.0 ppb
2017-06-209588-803-103015.0 ppb
2017-06-209588-804-11159.80 ppb
2017-06-209588-805-100012.0 ppb
2017-06-209588-806-09357.30 ppb
2017-06-209588-807-102014.0 ppb
2017-07-189588-007-1125ND
2017-07-189588-013-1245ND
2017-09-069588-011-0930ND
2017-09-199588-800-101520.0 ppb
2017-09-199588-801-100515.0 ppb
2017-09-199588-802-094513.0 ppb
2017-09-199588-803-093516.0 ppb
2017-09-199588-804-095013.0 ppb
2017-09-199588-805-103014.0 ppb
2017-09-199588-806-09005.40 ppb
2017-09-199588-807-092513.0 ppb
2017-10-039588-014-1055ND
2017-12-199588-800-10402.40 ppb
2017-12-199588-801-10302.80 ppb
2017-12-199588-802-10102.60 ppb
2017-12-199588-803-10002.60 ppb
2017-12-199588-804-10202.60 ppb
2017-12-199588-805-10502.80 ppb
2017-12-199588-806-09402.30 ppb
2017-12-199588-807-09502.80 ppb
2018-03-199588-800-09252.10 ppb
2018-03-199588-801-09152.50 ppb
2018-03-199588-802-08552.60 ppb
2018-03-199588-803-08453.90 ppb
2018-03-199588-804-09052.20 ppb
2018-03-199588-805-09352.50 ppb
2018-03-199588-806-08153.70 ppb
2018-03-199588-807-08302.60 ppb
2018-06-199588-800-12104.40 ppb
2018-06-199588-801-12053.90 ppb
2018-06-199588-802-11404.80 ppb
2018-06-199588-803-11304.40 ppb
2018-06-199588-804-11504.50 ppb
2018-06-199588-805-12255.30 ppb
2018-06-199588-806-1100ND
2018-06-199588-807-11152.70 ppb
2018-07-109588-007-0905ND
2018-07-109588-011-1050ND
2018-07-109588-013-1105ND
2018-09-199588-800-11153.30 ppb
2018-09-199588-801-11003.20 ppb
2018-09-199588-802-10303.60 ppb
2018-09-199588-803-10153.20 ppb
2018-09-199588-804-10452.20 ppb
2018-09-199588-805-11302.90 ppb
2018-09-199588-806-09454.40 ppb
2018-09-199588-807-10003.30 ppb
2018-10-029588-014-1020ND
2018-12-199588-800-11403.70 ppb
2018-12-199588-801-12004.10 ppb
2018-12-199588-802-12103.80 ppb
2018-12-199588-803-12202.70 ppb
2018-12-199588-804-11503.90 ppb
2018-12-199588-805-11304.70 ppb
2018-12-199588-806-12502.20 ppb
2018-12-199588-807-12352.90 ppb
2019-03-209588-800-09504.20 ppb
2019-03-209588-801-09403.70 ppb
2019-03-209588-802-09154.10 ppb
2019-03-209588-803-09053.60 ppb
2019-03-209588-804-09253.30 ppb
2019-03-209588-805-10104.00 ppb
2019-03-209588-806-08303.30 ppb
2019-03-209588-807-08503.80 ppb
2019-06-199588-800-10454.60 ppb
2019-06-199588-801-10205.50 ppb
2019-06-199588-802-11256.30 ppb
2019-06-199588-803-11106.20 ppb
2019-06-199588-804-10355.00 ppb
2019-06-199588-805-10105.20 ppb
2019-06-199588-806-09504.90 ppb
2019-06-199588-807-11005.10 ppb
2019-07-109588-007-1015ND
2019-07-109588-011-1135ND
2019-07-109588-013-1145ND
2019-09-199588-800-11453.80 ppb
2019-09-199588-801-12105.30 ppb
2019-09-199588-802-12455.30 ppb
2019-09-199588-803-12505.40 ppb
2019-09-199588-804-12203.90 ppb
2019-09-199588-805-12004.50 ppb
2019-09-199588-806-13152.20 ppb
2019-09-199588-807-13004.10 ppb
2019-10-029588-014-1115ND
2019-12-199588-800-09451.80 ppb
2019-12-199588-801-10351.90 ppb
2019-12-199588-802-10352.10 ppb
2019-12-199588-803-11005.00 ppb
2019-12-199588-804-10201.70 ppb
2019-12-199588-805-10052.00 ppb
2019-12-199588-806-11402.50 ppb
2019-12-199588-807-11201.60 ppb