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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Liberal

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.

 

61

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND50ND
20142.11 ppb163ND - 16.0 ppb
20150.975 ppb163ND - 5.90 ppb
20162.33 ppb123ND - 16.0 ppb
20172.33 ppb114ND - 13.2 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
2012-08-06583373TFND
2013-08-19601870TFND
2013-11-12605593TFND
2013-11-12605594TFND
2013-11-12605595TFND
2013-11-12605596TFND
2014-02-1060220ND
2014-02-1060221ND
2014-02-106022211.4 ppb
2014-02-1060223ND
2014-05-05110671ND
2014-05-05110670ND
2014-05-05110669ND
2014-05-051106686.40 ppb
2014-08-18175995ND
2014-08-18175993ND
2014-08-1817599216.0 ppb
2014-08-18175994ND
2014-11-18233943ND
2014-11-18233945ND
2014-11-18233947ND
2014-11-18233949ND
2015-02-09277240ND
2015-02-092772424.30 ppb
2015-02-09277239ND
2015-02-09277241ND
2015-05-11331836ND
2015-05-11331837ND
2015-05-11331839ND
2015-05-113318385.40 ppb
2015-08-31397036ND
2015-08-313970355.90 ppb
2015-08-31397034ND
2015-08-31397037ND
2015-11-02427997ND
2015-11-02427998ND
2015-11-02428000ND
2015-11-02427999ND
2016-02-29500710ND
2016-02-295007123.30 ppb
2016-02-29500713ND
2016-02-29500711ND
2016-05-16547728ND
2016-05-165477278.70 ppb
2016-05-16547730ND
2016-05-16547729ND
2016-08-22608720ND
2016-08-22608719ND
2016-08-22608717ND
2016-08-2260871816.0 ppb
2017-08-298300596.00 ppb
2017-08-29830068ND
2017-11-07873209_PACE5.60 ppb
2017-11-07873202_PACE0.860 ppb
2017-11-07873205_PACEND
2017-11-07873205ND
2017-11-07873171_PACEND
2017-11-07873170_PACEND
2017-11-07873169_PACEND
2017-11-07873172_PACEND
2017-11-07873204_PACE13.2 ppb