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EWG's Tap Water Database

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Chloroform

Talbotton

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.

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.358 ppb93ND - 1.60 ppb
2011ND70ND
20121.43 ppb43ND - 4.30 ppb
20130.482 ppb53ND - 0.820 ppb
20140.200 ppb51ND - 1.000 ppb
2015ND20ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.4 ppb

The 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.

EPA Maximum Contaminant
Level Goal (MCLG)70.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-03-09AG84265ND
2010-03-09AG84264ND
2010-03-31AG85828ND
2010-03-31AG85827ND
2010-03-31AG85826ND
2010-03-31AG85825ND
2010-08-23AG994081.60 ppb
2010-09-21AH043471.10 ppb
2010-11-02AH098250.520 ppb
2011-03-28AH26182ND
2011-03-28AH26181ND
2011-03-28AH26180ND
2011-03-28AH26179ND
2011-06-07AH31367ND
2011-08-16AH37704ND
2011-11-08AH46040ND
2012-02-21AH53739ND
2012-05-01AH578210.760 ppb
2012-07-26AH714400.670 ppb
2012-11-19AH843294.30 ppb
2013-02-14AH892140.810 ppb
2013-05-09AI010680.820 ppb
2013-07-29AI076700.780 ppb
2013-09-03AI13859ND
2013-11-04AI22051ND
2014-01-23AI27097ND
2014-05-05AI39581ND
2014-07-24AI466811.000 ppb
2014-07-24AI46661ND
2014-11-06AI59253ND
2015-02-19AI65257ND
2015-09-24AI90775ND