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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Athens - Clarke County 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.

MORE ABOUT THIS CONTAMINANT

 

198

Samples

0

Samples exceeding legal limit (MCL)

177

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201440.8 ppb3331ND - 73.0 ppb
201538.9 ppb3329ND - 73.0 ppb
201632.8 ppb3329ND - 75.0 ppb
201739.5 ppb3329ND - 79.0 ppb
201838.4 ppb3329ND - 78.0 ppb
201941.4 ppb3330ND - 78.0 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
2014-01-14AI2658038.0 ppb
2014-01-14AI2658129.0 ppb
2014-01-14AI2658226.0 ppb
2014-01-14AI2658330.0 ppb
2014-01-14AI2658421.0 ppb
2014-01-14AI2658523.0 ppb
2014-01-14AI2658651.0 ppb
2014-01-14AI2658732.0 ppb
2014-02-17AI281678.30 ppb
2014-04-15AI3805848.0 ppb
2014-04-15AI3805936.0 ppb
2014-04-15AI3806041.0 ppb
2014-04-15AI3806136.0 ppb
2014-04-15AI3806224.0 ppb
2014-04-15AI3806327.0 ppb
2014-04-15AI3806460.0 ppb
2014-04-15AI3806556.0 ppb
2014-07-15AI4588665.0 ppb
2014-07-15AI45887ND
2014-07-15AI4588848.0 ppb
2014-07-15AI4588962.0 ppb
2014-07-15AI4589073.0 ppb
2014-07-15AI4589136.0 ppb
2014-07-15AI4589265.0 ppb
2014-07-15AI4589353.0 ppb
2014-10-07AI5703745.0 ppb
2014-10-07AI57038ND
2014-10-07AI5703947.0 ppb
2014-10-07AI5704059.0 ppb
2014-10-07AI5704172.0 ppb
2014-10-07AI5704231.0 ppb
2014-10-07AI5704351.0 ppb
2014-10-07AI5704453.0 ppb
2015-01-21AI6315334.0 ppb
2015-01-21AI63154ND
2015-01-21AI6315516.0 ppb
2015-01-21AI6315648.0 ppb
2015-01-21AI6315714.0 ppb
2015-01-21AI6315820.0 ppb
2015-01-21AI6315939.0 ppb
2015-01-21AI6316033.0 ppb
2015-02-04AI641927.10 ppb
2015-04-14AI7479144.0 ppb
2015-04-14AI74792ND
2015-04-14AI7479346.0 ppb
2015-04-14AI7479459.0 ppb
2015-04-14AI7479526.0 ppb
2015-04-14AI7479646.0 ppb
2015-04-14AI7479762.0 ppb
2015-04-14AI7479858.0 ppb
2015-07-13AI8269344.0 ppb
2015-07-13AI82694ND
2015-07-13AI8269544.0 ppb
2015-07-13AI8269673.0 ppb
2015-07-13AI8269740.0 ppb
2015-07-13AI8269838.0 ppb
2015-07-13AI8269960.0 ppb
2015-07-13AI8270055.0 ppb
2015-10-21AI9958450.0 ppb
2015-10-21AI99585ND
2015-10-21AI9958650.0 ppb
2015-10-21AI9958756.0 ppb
2015-10-21AI9958861.0 ppb
2015-10-21AI9958933.0 ppb
2015-10-21AI9959073.0 ppb
2015-10-21AI9959153.0 ppb
2016-01-19AJ0460422.0 ppb
2016-01-19AJ04605ND
2016-01-19AJ0460623.0 ppb
2016-01-19AJ0460732.0 ppb
2016-01-19AJ0460849.0 ppb
2016-01-19AJ0460928.0 ppb
2016-01-19AJ0461036.0 ppb
2016-01-19AJ0461127.0 ppb
2016-02-02AJ054977.80 ppb
2016-04-18AJ1024524.0 ppb
2016-04-18AJ10246ND
2016-04-18AJ1024723.0 ppb
2016-04-18AJ1024818.0 ppb
2016-04-18AJ1024942.0 ppb
2016-04-18AJ1025030.0 ppb
2016-04-18AJ1025144.0 ppb
2016-04-18AJ1025236.0 ppb
2016-07-18AJ1809449.0 ppb
2016-07-18AJ18095ND
2016-07-18AJ1809652.0 ppb
2016-07-18AJ1809749.0 ppb
2016-07-18AJ1809875.0 ppb
2016-07-18AJ1809961.0 ppb
2016-07-18AJ1810069.0 ppb
2016-07-18AJ1810161.0 ppb
2016-10-17AJ3151431.0 ppb
2016-10-17AJ31515ND
2016-10-17AJ3151628.0 ppb
2016-10-17AJ3151723.0 ppb
2016-10-17AJ3151837.0 ppb
2016-10-17AJ3151930.0 ppb
2016-10-17AJ3152041.0 ppb
2016-10-17AJ3152136.0 ppb
2017-01-17AJ3816625.0 ppb
2017-01-17AJ38167ND
2017-01-17AJ3816822.0 ppb
2017-01-17AJ3816924.0 ppb
2017-01-17AJ3817054.0 ppb
2017-01-17AJ3817125.0 ppb
2017-01-17AJ3817238.0 ppb
2017-01-17AJ3817329.0 ppb
2017-04-17AJ5337641.0 ppb
2017-04-17AJ53377ND
2017-04-17AJ5337837.0 ppb
2017-04-17AJ5337927.0 ppb
2017-04-17AJ5338059.0 ppb
2017-04-17AJ5338129.0 ppb
2017-04-17AJ5338249.0 ppb
2017-04-17AJ5338339.0 ppb
2017-05-02AJ544586.10 ppb
2017-07-17AJ6053965.0 ppb
2017-07-17AJ60540ND
2017-07-17AJ6054144.0 ppb
2017-07-17AJ6054248.0 ppb
2017-07-17AJ6054371.0 ppb
2017-07-17AJ6054439.0 ppb
2017-07-17AJ6054573.0 ppb
2017-07-17AJ6054658.0 ppb
2017-10-16AJ7184951.0 ppb
2017-10-16AJ71850ND
2017-10-16AJ7185148.0 ppb
2017-10-16AJ7185263.0 ppb
2017-10-16AJ7185379.0 ppb
2017-10-16AJ7185440.0 ppb
2017-10-16AJ7185559.0 ppb
2017-10-16AJ7185663.0 ppb
2018-01-16AJ7665318.0 ppb
2018-01-16AJ76654ND
2018-01-16AJ7665515.0 ppb
2018-01-16AJ7665618.0 ppb
2018-01-16AJ7665724.0 ppb
2018-01-16AJ7665819.0 ppb
2018-01-16AJ7665926.0 ppb
2018-01-16AJ7666024.0 ppb
2018-02-06AJ832338.10 ppb
2018-04-18AJ8774572.0 ppb
2018-04-18AJ87746ND
2018-04-18AJ8774721.0 ppb
2018-04-18AJ8774858.0 ppb
2018-04-18AJ8774946.0 ppb
2018-04-18AJ8775025.0 ppb
2018-04-18AJ8775155.0 ppb
2018-04-18AJ8775237.0 ppb
2018-07-16AJ9420572.0 ppb
2018-07-16AJ94206ND
2018-07-16AJ9420742.0 ppb
2018-07-16AJ9420877.0 ppb
2018-07-16AJ9420978.0 ppb
2018-07-16AJ9421049.0 ppb
2018-07-16AJ9421177.0 ppb
2018-07-16AJ9421266.0 ppb
2018-10-16AK0422544.0 ppb
2018-10-16AK04226ND
2018-10-16AK0422739.0 ppb
2018-10-16AK0422840.0 ppb
2018-10-16AK0422970.0 ppb
2018-10-16AK0423038.0 ppb
2018-10-16AK0423158.0 ppb
2018-10-16AK0423252.0 ppb
2019-01-15AK0950260.0 ppb
2019-01-15AK09503ND
2019-01-15AK0950419.0 ppb
2019-01-15AK0950564.0 ppb
2019-01-15AK0950646.0 ppb
2019-01-15AK0950721.0 ppb
2019-01-15AK0950856.0 ppb
2019-01-15AK0950935.0 ppb
2019-02-26AK120955.00 ppb
2019-04-15AK1520944.0 ppb
2019-04-15AK1521041.0 ppb
2019-04-15AK1521131.0 ppb
2019-04-15AK1521234.0 ppb
2019-04-15AK1521349.0 ppb
2019-04-15AK1521429.0 ppb
2019-04-15AK1521541.0 ppb
2019-04-15AK1521640.0 ppb
2019-07-15AK2239374.0 ppb
2019-07-15AK22394ND
2019-07-15AK2239544.0 ppb
2019-07-15AK2239663.0 ppb
2019-07-15AK2239778.0 ppb
2019-07-15AK2239841.0 ppb
2019-07-15AK2239978.0 ppb
2019-07-15AK2240065.0 ppb
2019-10-15AK3517664.0 ppb
2019-10-15AK35177ND
2019-10-15AK3517834.0 ppb
2019-10-15AK3517950.0 ppb
2019-10-15AK3518022.0 ppb
2019-10-15AK3518131.0 ppb
2019-10-15AK3518258.0 ppb
2019-10-15AK3518349.0 ppb