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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Emporia

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

 

92

Samples

0

Samples exceeding legal limit (MCL)

56

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.356 ppb1610ND - 0.620 ppb
20150.592 ppb1612ND - 1.40 ppb
20160.0750 ppb162ND - 0.600 ppb
20170.429 ppb168ND - 1.10 ppb
20181.65 ppb12120.750 ppb - 3.70 ppb
20190.617 ppb1612ND - 1.10 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
2014-02-17626560.519 ppb
2014-02-17626540.551 ppb
2014-02-1762652ND
2014-02-1762650ND
2014-04-22100330ND
2014-04-22100329ND
2014-04-22100328ND
2014-04-22100327ND
2014-07-221560960.620 ppb
2014-07-221560950.620 ppb
2014-07-221560970.550 ppb
2014-07-221560980.550 ppb
2014-10-152142680.570 ppb
2014-10-152142670.540 ppb
2014-10-152142660.580 ppb
2014-10-152142650.590 ppb
2015-01-27267735ND
2015-01-27267734ND
2015-01-27267733ND
2015-01-27267732ND
2015-04-283198160.540 ppb
2015-04-283198150.560 ppb
2015-04-283198170.540 ppb
2015-04-283198180.550 ppb
2015-07-283746101.20 ppb
2015-07-283746091.40 ppb
2015-07-283746081.30 ppb
2015-07-283746070.930 ppb
2015-10-274188220.590 ppb
2015-10-274188210.650 ppb
2015-10-274188200.570 ppb
2015-10-274188190.640 ppb
2016-02-02484840ND
2016-02-02484837ND
2016-02-02484838ND
2016-02-02484839ND
2016-04-18529837ND
2016-04-18529836ND
2016-04-18529835ND
2016-04-18529834ND
2016-07-26590153ND
2016-07-26590152ND
2016-07-26590151ND
2016-07-26590150ND
2016-10-256479670.600 ppb
2016-10-256479660.600 ppb
2016-10-25647965ND
2016-10-25647964ND
2017-01-30678887ND
2017-01-30678886ND
2017-01-30678885ND
2017-01-30678884ND
2017-04-247464690.630 ppb
2017-04-247464681.10 ppb
2017-04-247464640.750 ppb
2017-04-247464630.930 ppb
2017-07-318077650.830 ppb
2017-07-318077631.000 ppb
2017-07-318077640.870 ppb
2017-07-318077660.750 ppb
2017-10-30868916ND
2017-10-30868915ND
2017-10-30868914ND
2017-10-30868913ND
2018-01-309067221.000 ppb
2018-01-309067210.750 ppb
2018-01-309067200.860 ppb
2018-01-309067191.30 ppb
2018-07-3010145091.60 ppb
2018-07-3010145062.50 ppb
2018-07-3010145071.70 ppb
2018-07-3010145082.20 ppb
2018-11-1310769801.40 ppb
2018-11-1310769791.20 ppb
2018-11-1310769781.60 ppb
2018-11-1310769773.70 ppb
2019-01-2811108870.570 ppb
2019-01-2811108880.550 ppb
2019-01-2811108890.560 ppb
2019-01-2811108900.600 ppb
2019-04-291137812ND
2019-04-291137811ND
2019-04-291137810ND
2019-04-291137809ND
2019-08-2012266800.990 ppb
2019-08-2012266791.10 ppb
2019-08-2012266780.930 ppb
2019-08-2012266771.10 ppb
2019-10-2912658110.820 ppb
2019-10-2912658120.870 ppb
2019-10-2912658130.880 ppb
2019-10-2912658100.900 ppb