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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Parker Little River 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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.350 ppb32ND - 0.530 ppb
20131.03 ppb440.520 ppb - 2.10 ppb
20140.880 ppb53ND - 1.80 ppb
20150.810 ppb43ND - 1.70 ppb
2016ND10ND
2017ND20ND

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
2012-04-04AH56029ND
2012-07-17AH701040.520 ppb
2012-10-16AH818800.530 ppb
2013-03-12AH905790.830 ppb
2013-05-02AI003410.520 ppb
2013-08-06AI092762.10 ppb
2013-10-07AI199990.660 ppb
2014-01-09AI26220ND
2014-04-08AI37323ND
2014-07-09AI451601.80 ppb
2014-07-09AI451591.60 ppb
2014-10-07AI568451.000 ppb
2015-01-23AI633330.880 ppb
2015-04-10AI745971.70 ppb
2015-07-10AI824890.660 ppb
2015-10-12AI92660ND
2016-02-10AJ06225ND
2017-05-11AJ55238ND
2017-08-14AJ63940ND