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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Sturgis

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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.000 ppb111.000 ppb
20131.16 ppb550.500 ppb - 2.40 ppb
20141.10 ppb2515ND - 5.80 ppb
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A

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
2012-08-28LLE451041.000 ppb
2013-09-04LLE917791.10 ppb
2013-11-12LLF023640.800 ppb
2013-11-13LLF023620.500 ppb
2013-11-13LLF023631.000 ppb
2013-11-20LLF023652.40 ppb
2014-02-19LLF10057ND
2014-02-19LLF100580.600 ppb
2014-02-19LLF100590.700 ppb
2014-02-19LLF100600.700 ppb
2014-05-12LLF178231.10 ppb
2014-05-12LLF17825ND
2014-05-12LLF178220.600 ppb
2014-05-12LLF178241.60 ppb
2014-07-08LLF26468ND
2014-07-08LLF26469ND
2014-07-08LLF26467ND
2014-09-18LLF400621.90 ppb
2014-09-18LLF400631.10 ppb
2014-09-18LLF40060ND
2014-09-18LLF40061ND
2014-09-18LLF400641.90 ppb
2014-09-18LLF40060ND
2014-09-18LLF40061ND
2014-09-23LLF400595.80 ppb
2014-09-23LLF400652.40 ppb
2014-09-23LLF400595.80 ppb
2014-11-10LLF459051.10 ppb
2014-11-10LLF459041.20 ppb
2014-11-10LLF45907ND
2014-11-10LLF459061.10 ppb