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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Winfield

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

76

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.470 ppb1610ND - 1.40 ppb
20150.441 ppb169ND - 1.20 ppb
20161.08 ppb16160.510 ppb - 2.00 ppb
20171.12 ppb16160.770 ppb - 2.30 ppb
20180.880 ppb1613ND - 2.50 ppb
20190.627 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
2014-02-1864085ND
2014-02-18640820.881 ppb
2014-02-18640790.605 ppb
2014-02-18640760.559 ppb
2014-05-05109986ND
2014-05-051099850.880 ppb
2014-05-05109984ND
2014-05-05109983ND
2014-08-181759710.600 ppb
2014-08-181759700.590 ppb
2014-08-18175972ND
2014-08-181759730.550 ppb
2014-11-17232885ND
2014-11-172328830.850 ppb
2014-11-172328811.40 ppb
2014-11-172328790.600 ppb
2015-02-09277268ND
2015-02-092772670.500 ppb
2015-02-09277266ND
2015-02-09277265ND
2015-05-183350060.660 ppb
2015-05-183350070.670 ppb
2015-05-183350090.750 ppb
2015-05-183350081.20 ppb
2015-08-10382877ND
2015-08-103828760.550 ppb
2015-08-10382875ND
2015-08-10382874ND
2015-11-164279411.20 ppb
2015-11-16427940ND
2015-11-164279390.890 ppb
2015-11-164279380.640 ppb
2016-02-084908440.680 ppb
2016-02-084908430.810 ppb
2016-02-084908451.40 ppb
2016-02-084908460.660 ppb
2016-05-165476401.60 ppb
2016-05-165476390.930 ppb
2016-05-165476381.30 ppb
2016-05-165476371.000 ppb
2016-08-226087401.000 ppb
2016-08-226087391.40 ppb
2016-08-226087380.680 ppb
2016-08-226087370.510 ppb
2016-11-146600931.000 ppb
2016-11-146600960.720 ppb
2016-11-146600951.60 ppb
2016-11-146600942.00 ppb
2017-02-067048250.950 ppb
2017-02-067048241.10 ppb
2017-02-067048230.960 ppb
2017-02-067048221.10 ppb
2017-05-157623231.10 ppb
2017-05-157623221.40 ppb
2017-05-157623211.10 ppb
2017-05-157623200.820 ppb
2017-08-218238810.900 ppb
2017-08-218238801.60 ppb
2017-08-218238822.30 ppb
2017-08-218239331.10 ppb
2017-11-068724870.810 ppb
2017-11-068724860.960 ppb
2017-11-068724850.770 ppb
2017-11-068724840.880 ppb
2018-02-12907499ND
2018-02-129074980.500 ppb
2018-02-12907497ND
2018-02-129074960.870 ppb
2018-05-219741300.840 ppb
2018-05-219741310.590 ppb
2018-05-219741331.70 ppb
2018-05-21974132ND
2018-08-0610215780.700 ppb
2018-08-0610215770.800 ppb
2018-08-0610215760.890 ppb
2018-08-0610215751.10 ppb
2018-11-1210767581.60 ppb
2018-11-1210767571.10 ppb
2018-11-1210767560.890 ppb
2018-11-1210767552.50 ppb
2019-02-111120368ND
2019-02-1111203670.780 ppb
2019-02-111120369ND
2019-02-1111203700.970 ppb
2019-04-1511385810.910 ppb
2019-04-1511385800.790 ppb
2019-04-1511385790.940 ppb
2019-04-1511385780.960 ppb
2019-07-151204795ND
2019-07-1512047930.750 ppb
2019-07-1512047910.760 ppb
2019-07-1512047890.710 ppb
2019-10-211262831ND
2019-10-2112628340.780 ppb
2019-10-2112628331.10 ppb
2019-10-2112628320.580 ppb