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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Great Bend

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

 

103

Samples

0

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.84 ppb169ND - 33.0 ppb
20152.35 ppb168ND - 11.0 ppb
20164.10 ppb168ND - 23.0 ppb
20171.97 ppb237ND - 14.0 ppb
20183.02 ppb167ND - 30.0 ppb
20194.12 ppb169ND - 29.0 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
2014-03-1076326ND
2014-03-1076330ND
2014-03-10763369.61 ppb
2014-03-10763401.84 ppb
2014-06-091267953.50 ppb
2014-06-091267997.10 ppb
2014-06-09126815ND
2014-06-09126816ND
2014-09-081914961.50 ppb
2014-09-0819150133.0 ppb
2014-09-08191503ND
2014-09-08191504ND
2014-12-012389251.20 ppb
2014-12-01238926ND
2014-12-012389273.10 ppb
2014-12-012389280.550 ppb
2015-03-09293645ND
2015-03-09293646ND
2015-03-092936473.00 ppb
2015-03-092936482.30 ppb
2015-06-083465829.30 ppb
2015-06-08346583ND
2015-06-08346584ND
2015-06-083465940.920 ppb
2015-09-08403446ND
2015-09-08403447ND
2015-09-084034486.80 ppb
2015-09-0840344911.0 ppb
2015-12-144618613.60 ppb
2015-12-144618620.640 ppb
2015-12-14461863ND
2015-12-14461864ND
2016-03-21513212ND
2016-03-215132136.90 ppb
2016-03-21513214ND
2016-03-215132151.60 ppb
2016-06-06560319ND
2016-06-065603202.70 ppb
2016-06-06560321ND
2016-06-0656032223.0 ppb
2016-09-0661665514.0 ppb
2016-09-066166565.70 ppb
2016-09-06616657ND
2016-09-06616658ND
2016-12-12674276ND
2016-12-126742777.40 ppb
2016-12-12674278ND
2016-12-126742794.30 ppb
2017-03-067208914.00 ppb
2017-03-06720892ND
2017-03-06720893ND
2017-03-06720894ND
2017-06-057714337.20 ppb
2017-06-05771434ND
2017-06-057714353.90 ppb
2017-06-05771436ND
2017-09-18843193ND
2017-09-1884319414.0 ppb
2017-09-18843195ND
2017-10-168627711.000 ppb
2017-11-27883265_PACEND
2017-11-27883266_PACEND
2017-11-27883267_PACEND
2017-11-27883269_PACEND
2017-11-27883299_PACEND
2017-11-27883300_PACEND
2017-11-27883303_PACEND
2017-12-1189213714.0 ppb
2017-12-11892138ND
2017-12-11892139ND
2017-12-118921401.30 ppb
2018-03-129372840.630 ppb
2018-03-12937285ND
2018-03-129372863.20 ppb
2018-03-12937287ND
2018-06-049797810.980 ppb
2018-06-04979782ND
2018-06-04979783ND
2018-06-0497978412.0 ppb
2018-09-101041930ND
2018-09-10104193130.0 ppb
2018-09-1010419320.740 ppb
2018-09-101041933ND
2018-12-171093090ND
2018-12-1710930910.720 ppb
2018-12-171093092ND
2018-12-171093093ND
2019-03-18113868329.0 ppb
2019-03-1811386841.10 ppb
2019-03-181138685ND
2019-03-181138686ND
2019-06-031179039ND
2019-06-0311790408.80 ppb
2019-06-0311790414.50 ppb
2019-06-031179042ND
2019-09-091239307ND
2019-09-09123930810.00 ppb
2019-09-0912393090.830 ppb
2019-09-091239310ND
2019-12-0212824870.740 ppb
2019-12-0212824880.970 ppb
2019-12-021282489ND
2019-12-02128249010.00 ppb