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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Marshfield Water Department

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

 

176

Samples

0

Samples exceeding legal limit (MCL)

50

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.254 ppb268ND - 1.40 ppb
20150.232 ppb3110ND - 1.20 ppb
20160.260 ppb258ND - 1.30 ppb
20170.285 ppb3411ND - 1.20 ppb
20180.170 ppb306ND - 1.30 ppb
20190.220 ppb307ND - 1.40 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 Result
2014-02-070.900 ppb
2014-02-07ND
2014-02-07ND
2014-02-07ND
2014-02-070.700 ppb
2014-02-07ND
2014-02-07ND
2014-02-071.40 ppb
2014-03-25ND
2014-04-170.800 ppb
2014-04-29ND
2014-04-29ND
2014-04-290.500 ppb
2014-04-29ND
2014-04-29ND
2014-05-13ND
2014-08-06ND
2014-08-06ND
2014-08-06ND
2014-08-190.800 ppb
2014-10-100.800 ppb
2014-10-10ND
2014-10-100.700 ppb
2014-10-10ND
2014-11-06ND
2014-11-06ND
2015-02-260.900 ppb
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-260.600 ppb
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-261.20 ppb
2015-03-13ND
2015-04-280.600 ppb
2015-05-14ND
2015-05-14ND
2015-05-140.600 ppb
2015-05-14ND
2015-05-140.700 ppb
2015-05-14ND
2015-08-06ND
2015-08-06ND
2015-08-060.700 ppb
2015-08-06ND
2015-08-070.500 ppb
2015-08-070.700 ppb
2015-08-07ND
2015-08-07ND
2015-10-16ND
2015-12-07ND
2015-12-07ND
2015-12-07ND
2015-12-110.700 ppb
2016-01-130.900 ppb
2016-02-180.700 ppb
2016-02-18ND
2016-02-18ND
2016-02-180.600 ppb
2016-02-18ND
2016-02-18ND
2016-02-18ND
2016-02-18ND
2016-02-181.30 ppb
2016-05-20ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-08-080.800 ppb
2016-08-081.000 ppb
2016-08-080.600 ppb
2016-08-080.600 ppb
2016-09-08ND
2016-09-08ND
2016-09-09ND
2016-11-30ND
2016-11-30ND
2016-11-30ND
2017-02-020.900 ppb
2017-02-02ND
2017-02-021.000 ppb
2017-02-280.800 ppb
2017-02-28ND
2017-02-280.600 ppb
2017-02-28ND
2017-02-28ND
2017-02-28ND
2017-02-28ND
2017-02-281.20 ppb
2017-02-280.900 ppb
2017-03-01ND
2017-03-01ND
2017-05-11ND
2017-05-150.900 ppb
2017-05-24ND
2017-05-24ND
2017-05-24ND
2017-05-24ND
2017-08-09ND
2017-08-090.600 ppb
2017-08-09ND
2017-08-09ND
2017-09-13ND
2017-09-13ND
2017-09-13ND
2017-09-131.000 ppb
2017-11-160.800 ppb
2017-11-16ND
2017-11-16ND
2017-11-16ND
2017-11-161.000 ppb
2017-11-17ND
2018-02-141.000 ppb
2018-02-14ND
2018-02-140.800 ppb
2018-02-14ND
2018-02-14ND
2018-02-141.30 ppb
2018-02-16ND
2018-02-16ND
2018-02-16ND
2018-04-24ND
2018-05-04ND
2018-05-04ND
2018-05-04ND
2018-05-04ND
2018-05-04ND
2018-06-270.800 ppb
2018-08-13ND
2018-08-130.500 ppb
2018-08-13ND
2018-08-13ND
2018-09-04ND
2018-09-04ND
2018-09-04ND
2018-09-04ND
2018-10-17ND
2018-11-150.700 ppb
2018-11-15ND
2018-11-15ND
2018-11-15ND
2018-11-15ND
2019-01-03ND
2019-01-03ND
2019-01-03ND
2019-01-030.700 ppb
2019-01-03ND
2019-01-03ND
2019-01-03ND
2019-03-010.700 ppb
2019-03-01ND
2019-03-011.20 ppb
2019-04-12ND
2019-06-05ND
2019-06-05ND
2019-06-05ND
2019-06-05ND
2019-06-07ND
2019-08-270.600 ppb
2019-08-271.40 ppb
2019-08-271.40 ppb
2019-08-27ND
2019-09-05ND
2019-09-05ND
2019-09-05ND
2019-09-05ND
2019-10-22ND
2019-11-22ND
2019-11-22ND
2019-11-22ND
2019-11-22ND
2019-12-200.600 ppb