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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Fitzgerald

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

 

106

Samples

0

Samples exceeding legal limit (MCL)

70

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.810 ppb209ND - 3.40 ppb
20152.26 ppb1711ND - 6.30 ppb
20162.13 ppb1611ND - 6.60 ppb
20171.96 ppb2016ND - 6.40 ppb
20181.88 ppb1711ND - 7.90 ppb
20192.41 ppb1612ND - 7.00 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
2014-02-17AI28005ND
2014-02-17AI28006ND
2014-02-17AI280071.70 ppb
2014-02-17AI28008ND
2014-05-12AI40346ND
2014-05-12AI403471.50 ppb
2014-05-12AI403482.40 ppb
2014-05-12AI40349ND
2014-05-28AI415641.40 ppb
2014-05-28AI41565ND
2014-05-28AI415660.500 ppb
2014-05-28AI41567ND
2014-08-18AI50325ND
2014-08-18AI503261.50 ppb
2014-08-18AI503272.40 ppb
2014-08-18AI50328ND
2014-11-20AI59964ND
2014-11-20AI599651.40 ppb
2014-11-20AI599663.40 ppb
2014-11-20AI59967ND
2015-02-18AI65154ND
2015-02-18AI651551.70 ppb
2015-02-18AI651562.80 ppb
2015-02-18AI65157ND
2015-05-18AI77383ND
2015-05-18AI773842.40 ppb
2015-05-18AI773854.60 ppb
2015-05-18AI773861.70 ppb
2015-06-09AI79300ND
2015-08-19AI87043ND
2015-08-19AI870443.00 ppb
2015-08-19AI870455.90 ppb
2015-08-19AI870462.30 ppb
2015-11-17AJ01330ND
2015-11-17AJ013313.20 ppb
2015-11-17AJ013324.60 ppb
2015-11-17AJ013336.30 ppb
2016-02-17AJ06663ND
2016-02-17AJ066643.10 ppb
2016-02-17AJ066653.40 ppb
2016-02-17AJ06666ND
2016-05-17AJ12373ND
2016-05-17AJ123742.30 ppb
2016-05-17AJ123753.10 ppb
2016-05-17AJ123761.30 ppb
2016-08-16AJ22886ND
2016-08-16AJ228872.70 ppb
2016-08-16AJ228885.70 ppb
2016-08-16AJ228896.60 ppb
2016-11-15AJ33564ND
2016-11-15AJ335651.90 ppb
2016-11-15AJ335661.40 ppb
2016-11-15AJ335672.50 ppb
2017-02-22AJ469624.60 ppb
2017-02-22AJ469631.80 ppb
2017-02-22AJ469642.50 ppb
2017-02-22AJ469654.00 ppb
2017-02-23AJ470390.660 ppb
2017-02-23AJ47040ND
2017-02-23AJ470411.10 ppb
2017-02-23AJ470423.20 ppb
2017-05-17AJ556651.20 ppb
2017-05-17AJ556661.40 ppb
2017-05-17AJ55667ND
2017-05-17AJ556681.10 ppb
2017-08-22AJ65303ND
2017-08-22AJ653043.70 ppb
2017-08-22AJ653051.40 ppb
2017-08-22AJ653066.40 ppb
2017-11-20AJ74096ND
2017-11-20AJ740973.20 ppb
2017-11-20AJ740981.40 ppb
2017-11-20AJ740991.50 ppb
2018-02-20AJ84225ND
2018-02-20AJ842262.40 ppb
2018-02-20AJ842271.30 ppb
2018-02-20AJ842281.60 ppb
2018-05-22AJ89950ND
2018-05-22AJ899512.40 ppb
2018-05-22AJ899521.40 ppb
2018-05-22AJ899537.90 ppb
2018-06-18AJ91829ND
2018-08-21AJ98458ND
2018-08-21AJ984592.60 ppb
2018-08-21AJ984601.70 ppb
2018-08-21AJ984616.50 ppb
2018-11-12AK05757ND
2018-11-12AK057582.70 ppb
2018-11-12AK057591.40 ppb
2018-11-12AK05760ND
2019-02-19AK11651ND
2019-02-19AK116522.10 ppb
2019-02-19AK11653ND
2019-02-19AK116545.60 ppb
2019-05-16AK17729ND
2019-05-16AK177302.40 ppb
2019-05-16AK177311.40 ppb
2019-05-16AK177325.70 ppb
2019-08-20AK274522.20 ppb
2019-08-20AK274533.20 ppb
2019-08-20AK274541.40 ppb
2019-08-20AK274557.00 ppb
2019-11-19AK37095ND
2019-11-19AK370962.30 ppb
2019-11-19AK370971.40 ppb
2019-11-19AK370983.90 ppb