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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Highland Water Authority

NOTE: Highland Water Authority purchases water from Gadsden Water Works and Sewer Board which is required to test for chloroform. Sample information shown below was taken by Gadsden Water Works and Sewer Board.

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20129.25 ppb119.25 ppb
201313.5 ppb1113.5 ppb
20142.72 ppb112.72 ppb
201516.6 ppb1116.6 ppb
20167.52 ppb117.52 ppb
20179.63 ppb119.63 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

NOTE: Highland Water Authority purchases water from Gadsden Water Works and Sewer Board which is required to test for chloroform. Sample information shown below was taken by Gadsden Water Works and Sewer Board.

Date Lab ID Result
2012-06-08120608040-19.25 ppb
2013-05-31130531030-113.5 ppb
2014-06-09140609030-12.72 ppb
2015-06-19150619025-116.6 ppb
2016-05-27160527042-17.52 ppb
2017-06-01170601043-19.63 ppb