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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Memorial Villages Water Authority

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

 

95

Samples

0

Samples exceeding legal limit (MCL)

70

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201417.5 ppb8810.8 ppb - 21.5 ppb
201522.9 ppb111111.7 ppb - 51.2 ppb
201616.9 ppb1913ND - 75.0 ppb
20175.07 ppb1910ND - 21.8 ppb
201813.9 ppb1915ND - 26.4 ppb
201911.7 ppb1913ND - 28.2 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
2014-02-19AC4358315.1 ppb
2014-02-19AC4353716.5 ppb
2014-05-12AC5387110.8 ppb
2014-05-12AC5390221.5 ppb
2014-07-22AC6060117.0 ppb
2014-07-22AC6055419.5 ppb
2014-10-17AC7006619.3 ppb
2014-10-17AC7006220.2 ppb
2015-01-23AC7761313.0 ppb
2015-01-23AC7761512.0 ppb
2015-01-23AC7761713.0 ppb
2015-01-23AC7775411.9 ppb
2015-01-23AC7775511.7 ppb
2015-05-15AC9226627.2 ppb
2015-05-15AC9226930.5 ppb
2015-07-10AC9908117.7 ppb
2015-07-10AC9907847.3 ppb
2015-12-11AD1675416.4 ppb
2015-12-11AD1675051.2 ppb
2016-01-20AD1889216.1 ppb
2016-01-20AD1889116.9 ppb
2016-01-20AD1889317.3 ppb
2016-01-20AD1888444.9 ppb
2016-03-14AD2854430.0 ppb
2016-03-14AD2854019.0 ppb
2016-03-14AD2848221.0 ppb
2016-04-26AD3415622.9 ppb
2016-04-26AD3415527.8 ppb
2016-04-26AD3415327.3 ppb
2016-04-26AD3415775.0 ppb
2016-07-20AD449041.10 ppb
2016-07-20AD44898ND
2016-07-20AD44899ND
2016-07-20AD44897ND
2016-10-05AD52550ND
2016-10-05AD525631.50 ppb
2016-10-05AD52566ND
2016-10-05AD52567ND
2017-01-04AD62962ND
2017-01-04AD62969ND
2017-01-04AD629642.00 ppb
2017-01-04AD62963ND
2017-01-04AD62999ND
2017-01-04AD62995ND
2017-01-04AD629973.40 ppb
2017-04-19AD801267.90 ppb
2017-04-19AD801346.20 ppb
2017-04-19AD801315.50 ppb
2017-04-19AD8013013.3 ppb
2017-08-17AD9335317.2 ppb
2017-08-17AD9335121.8 ppb
2017-08-17AD9335414.3 ppb
2017-08-17AD93350ND
2017-10-06AD99772ND
2017-10-06AD997844.80 ppb
2017-10-06AD99773ND
2017-10-06AD99789ND
2018-01-22AE0947414.1 ppb
2018-01-22AE0955722.0 ppb
2018-01-22AE0957515.0 ppb
2018-01-22AE09565ND
2018-01-22AE09484ND
2018-01-22AE0947513.6 ppb
2018-01-22AE0947214.4 ppb
2018-04-06AE2164926.4 ppb
2018-04-06AE2165124.5 ppb
2018-04-06AE2164823.9 ppb
2018-04-06AE216505.80 ppb
2018-08-03AE357994.00 ppb
2018-08-03AE358008.20 ppb
2018-08-03AE35797ND
2018-08-03AE35798ND
2018-11-07AE4561125.2 ppb
2018-11-07AE4561423.0 ppb
2018-11-07AE4561319.8 ppb
2018-11-07AE4561023.8 ppb
2019-01-10AE4932523.0 ppb
2019-01-10AE4932121.0 ppb
2019-02-11AE5372321.6 ppb
2019-02-11AE5372023.7 ppb
2019-02-11AE5372423.5 ppb
2019-02-11AE5372524.8 ppb
2019-04-01AE60631ND
2019-04-01AE60630ND
2019-04-01AE60626ND
2019-04-01AE606281.000 ppb
2019-07-12AE74335ND
2019-07-12AE74337ND
2019-07-12AE74336ND
2019-07-12AE7434020.9 ppb
2019-07-12AE7441918.0 ppb
2019-10-07AE857905.10 ppb
2019-10-07AE857955.00 ppb
2019-10-07AE858046.90 ppb
2019-10-07AE8579128.2 ppb