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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Collins Water System

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.800 ppb21ND - 1.60 ppb
2014ND10ND
2015ND10ND
20160.255 ppb21ND - 0.510 ppb
20172.41 ppb43ND - 6.80 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
2013-06-26AI049151.60 ppb
2013-09-04AI14449ND
2014-07-07AI44953ND
2015-09-30AI91812ND
2016-09-30AJ30290ND
2016-12-20AJ373290.510 ppb
2017-06-06AJ56805ND
2017-08-22AJ652366.80 ppb
2017-10-31AJ727010.630 ppb
2017-12-26AJ759692.20 ppb