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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

USMC Lejeune--New River Air Station

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

 

104

Samples

0

Samples exceeding legal limit (MCL)

104

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201426.5 ppb161613.3 ppb - 36.1 ppb
201529.7 ppb161619.0 ppb - 42.6 ppb
201628.1 ppb242412.5 ppb - 62.1 ppb
201720.9 ppb161610.8 ppb - 33.5 ppb
201821.6 ppb161616.0 ppb - 31.0 ppb
201919.1 ppb161610.7 ppb - 35.4 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
2014-01-23777609T21.5 ppb
2014-01-23777606T13.3 ppb
2014-01-23777607T23.0 ppb
2014-01-23777608T23.0 ppb
2014-04-16783635T36.1 ppb
2014-04-16783636T22.1 ppb
2014-04-16783637T28.5 ppb
2014-04-16783638T27.0 ppb
2014-07-23791005T31.8 ppb
2014-07-23791006T28.6 ppb
2014-07-23791007T28.0 ppb
2014-07-23791008T25.0 ppb
2014-10-21798021T25.2 ppb
2014-10-21798022T29.9 ppb
2014-10-21798023T32.4 ppb
2014-10-21798024T28.6 ppb
2015-01-2124.0 ppb
2015-01-2123.0 ppb
2015-01-2119.0 ppb
2015-01-2122.0 ppb
2015-04-2228.4 ppb
2015-04-2235.1 ppb
2015-04-2233.8 ppb
2015-04-2242.6 ppb
2015-07-2034.0 ppb
2015-07-2037.0 ppb
2015-07-2032.0 ppb
2015-07-2033.0 ppb
2015-10-2021.0 ppb
2015-10-2027.0 ppb
2015-10-2029.0 ppb
2015-10-2034.0 ppb
2016-01-2037729_16-0273818.0 ppb
2016-01-2037729_16-0273924.0 ppb
2016-01-2037729_16-0274013.0 ppb
2016-01-2037729_16-0274119.0 ppb
2016-04-2037729_16-1263537.1 ppb
2016-04-2037729_16-1263662.1 ppb
2016-04-2037729_16-1263751.7 ppb
2016-04-2037729_16-1263834.7 ppb
2016-05-0637729_16-1449419.1 ppb
2016-05-0637729_16-1449522.0 ppb
2016-05-0637729_16-1449630.4 ppb
2016-05-0637729_16-1449712.5 ppb
2016-06-1437729_16-1984533.4 ppb
2016-06-1437729_16-1984621.4 ppb
2016-06-1437729_16-1984721.7 ppb
2016-06-1437729_16-1984836.0 ppb
2016-07-1937729_16-2429130.5 ppb
2016-07-1937729_16-2429231.7 ppb
2016-07-1937729_16-2429331.6 ppb
2016-07-1937729_16-2429441.7 ppb
2016-10-1837729_16-3660924.1 ppb
2016-10-1837729_16-3661022.2 ppb
2016-10-1837729_16-3661117.4 ppb
2016-10-1837729_16-3661218.8 ppb
2017-01-1837729_17-0241712.9 ppb
2017-01-1837729_17-0242010.8 ppb
2017-01-1837729_17-0242111.6 ppb
2017-01-1837729_17-0242414.7 ppb
2017-04-1837729_17-1291822.9 ppb
2017-04-1837729_17-1291922.4 ppb
2017-04-1837729_17-1292027.8 ppb
2017-04-1837729_17-1292116.5 ppb
2017-07-1837729_17-2497233.5 ppb
2017-07-1837729_17-2497330.4 ppb
2017-07-1837729_17-2497429.8 ppb
2017-07-1837729_17-2497530.8 ppb
2017-10-1637729_17-3917813.9 ppb
2017-10-1637729_17-3917918.0 ppb
2017-10-1637729_17-3918022.3 ppb
2017-10-1637729_17-3918115.8 ppb
2018-01-2237729_18-02974 17.6 ppb
2018-01-2237729_18-02975 19.0 ppb
2018-01-2237729_18-02976 16.2 ppb
2018-01-2237729_18-02977 16.5 ppb
2018-04-1737729_18-15267 19.4 ppb
2018-04-1737729_18-15268 18.3 ppb
2018-04-1737729_18-15269 25.1 ppb
2018-04-1737729_18-15270 16.0 ppb
2018-07-1737729_18-29407 20.4 ppb
2018-07-1737729_18-29408 21.8 ppb
2018-07-1737729_18-29409 21.2 ppb
2018-07-1737729_18-29410 27.6 ppb
2018-10-1837729_18-43604 31.0 ppb
2018-10-1837729_18-43605 25.0 ppb
2018-10-1837729_18-43610 29.0 ppb
2018-10-1837729_18-43611 22.0 ppb
2019-01-1537729_19-02420 10.7 ppb
2019-01-1537729_19-02421 15.7 ppb
2019-01-1537729_19-02422 14.3 ppb
2019-01-1537729_19-02423 11.1 ppb
2019-04-168511-041619-B01M18.0 ppb
2019-04-168511-041619-B02M21.1 ppb
2019-04-168511-041619-B03M22.0 ppb
2019-04-168511-041619-B04M22.3 ppb
2019-07-198511-071919-B01M23.0 ppb
2019-07-198511-071919-B02M35.4 ppb
2019-07-198511-071919-B03M20.8 ppb
2019-07-198511-071919-B04M29.7 ppb
2019-10-1637729_19-44971 10.7 ppb
2019-10-1637729_19-44972 20.9 ppb
2019-10-1637729_19-44973 15.8 ppb
2019-10-1637729_19-44974 13.7 ppb