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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Quartz Hill 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

 

128

Samples

0

Samples exceeding legal limit (MCL)

73

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.16 ppb218ND - 3.60 ppb
20151.43 ppb2512ND - 5.00 ppb
20162.27 ppb259ND - 11.9 ppb
20175.29 ppb2516ND - 22.3 ppb
20183.18 ppb1612ND - 6.60 ppb
20192.03 ppb16161.000 ppb - 4.90 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
2014-02-253761-800-0830ND
2014-02-253761-801-0845ND
2014-02-253761-802-0740ND
2014-02-253761-803-0820ND
2014-06-243761-800-10002.50 ppb
2014-06-243761-801-10172.80 ppb
2014-06-243761-802-11103.60 ppb
2014-06-243761-803-10382.60 ppb
2014-08-193761-800-08402.80 ppb
2014-08-193761-801-08273.60 ppb
2014-08-193761-802-09153.40 ppb
2014-08-193761-803-09003.10 ppb
2014-10-283761-005-0742ND
2014-10-283761-006-0758ND
2014-10-283761-009-0821ND
2014-10-283761-012-0736ND
2014-10-283761-015-0904ND
2014-10-283761-016-0707ND
2014-10-283761-017-0844ND
2014-10-283761-018-0836ND
2014-10-283761-021-0655ND
2015-02-033761-800-09301.10 ppb
2015-02-033761-801-0817ND
2015-02-033761-802-0909ND
2015-02-033761-803-0835ND
2015-05-053761-800-07235.00 ppb
2015-05-053761-801-07504.70 ppb
2015-05-053761-802-09134.50 ppb
2015-05-053761-803-08311.90 ppb
2015-08-043761-800-11003.10 ppb
2015-08-043761-801-10403.90 ppb
2015-08-043761-802-09503.70 ppb
2015-08-043761-803-10252.70 ppb
2015-10-133761-005-0735ND
2015-10-133761-006-0800ND
2015-10-133761-009-0815ND
2015-10-133761-012-0720ND
2015-10-133761-015-0825ND
2015-10-133761-016-0900ND
2015-10-133761-017-0838ND
2015-10-133761-018-0848ND
2015-10-133761-021-0908ND
2015-11-033761-800-09151.10 ppb
2015-11-033761-801-09281.50 ppb
2015-11-033761-802-1035ND
2015-11-033761-803-10002.50 ppb
2016-02-023761-800-0810ND
2016-02-023761-801-0758ND
2016-02-023761-802-0942ND
2016-02-023761-803-0705ND
2016-05-033761-800-10359.40 ppb
2016-05-033761-801-092011.9 ppb
2016-05-033761-802-10105.80 ppb
2016-05-033761-803-09409.50 ppb
2016-07-193761-005-0845ND
2016-07-193761-006-0810ND
2016-07-193761-009-0755ND
2016-07-193761-012-0830ND
2016-07-193761-015-0650ND
2016-07-193761-016-0705ND
2016-07-193761-017-0740ND
2016-07-193761-018-0725ND
2016-07-193761-021-0715ND
2016-08-023761-800-10004.80 ppb
2016-08-023761-801-10133.30 ppb
2016-08-023761-802-09245.90 ppb
2016-08-023761-803-09505.00 ppb
2016-11-013761-800-1010ND
2016-11-013761-801-1000ND
2016-11-013761-802-11001.10 ppb
2016-11-013761-803-1020ND
2017-02-283761-800-090017.0 ppb
2017-02-283761-801-092022.1 ppb
2017-02-283761-802-104022.3 ppb
2017-02-283761-803-094020.2 ppb
2017-05-303761-800-09332.30 ppb
2017-05-303761-801-09453.60 ppb
2017-05-303761-802-10408.30 ppb
2017-05-303761-803-10057.50 ppb
2017-07-183761-005-0900ND
2017-07-183761-006-0840ND
2017-07-183761-009-0815ND
2017-07-183761-012-0850ND
2017-07-183761-015-0735ND
2017-07-183761-016-0700ND
2017-07-183761-017-0750ND
2017-07-183761-018-0805ND
2017-07-183761-021-0715ND
2017-08-013761-800-10153.20 ppb
2017-08-013761-801-10004.00 ppb
2017-08-013761-802-11153.80 ppb
2017-08-013761-803-10357.20 ppb
2017-11-283761-800-09552.60 ppb
2017-11-283761-801-09353.20 ppb
2017-11-283761-802-10572.30 ppb
2017-11-283761-803-10302.70 ppb
2018-02-273761-800-08155.20 ppb
2018-02-273761-801-08005.20 ppb
2018-02-273761-802-09005.60 ppb
2018-02-273761-803-07354.70 ppb
2018-05-293761-800-09552.80 ppb
2018-05-293761-801-09455.20 ppb
2018-05-293761-802-10556.60 ppb
2018-05-293761-803-10202.50 ppb
2018-08-283761-800-07304.90 ppb
2018-08-283761-801-07553.40 ppb
2018-08-283761-802-10153.80 ppb
2018-08-283761-803-07201.000 ppb
2018-11-273761-800-0930ND
2018-11-273761-801-0915ND
2018-11-273761-802-1035ND
2018-11-273761-803-1000ND
2019-02-263761-800-07471.20 ppb
2019-02-263761-801-07351.20 ppb
2019-02-263761-802-08201.000 ppb
2019-02-263761-803-08001.30 ppb
2019-05-283761-800-10121.20 ppb
2019-05-283761-801-10313.20 ppb
2019-05-283761-802-09302.20 ppb
2019-05-283761-803-10001.20 ppb
2019-08-273761-800-08301.50 ppb
2019-08-273761-801-08204.90 ppb
2019-08-273761-802-08583.90 ppb
2019-08-273761-803-08454.20 ppb
2019-11-263761-800-07451.30 ppb
2019-11-263761-801-07251.000 ppb
2019-11-263761-802-09001.80 ppb
2019-11-263761-803-08301.30 ppb