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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Waynesville

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201431.3 ppb161613.0 ppb - 52.0 ppb
201531.8 ppb161619.0 ppb - 55.0 ppb
201627.5 ppb16168.00 ppb - 48.6 ppb
201729.7 ppb161616.0 ppb - 46.3 ppb
201824.4 ppb161611.1 ppb - 44.0 ppb
201920.9 ppb161610.5 ppb - 32.0 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
2014-01-099218603000215.0 ppb
2014-01-099218603000321.0 ppb
2014-01-099218603000430.0 ppb
2014-01-099218603000113.0 ppb
2014-04-0992196762001DIS28.0 ppb
2014-04-0992196762002DIS21.0 ppb
2014-04-0992196762003DIS23.0 ppb
2014-04-0992196762004DIS16.0 ppb
2014-07-1492209273001DIS52.0 ppb
2014-07-1492209273002DIS30.0 ppb
2014-07-1492209273003DIS37.0 ppb
2014-07-1492209273004DIS38.0 ppb
2014-10-1592221743003TTH50.0 ppb
2014-10-1592221743004TTH39.0 ppb
2014-10-1592221743002TTH38.0 ppb
2014-10-1592221743001TTH50.0 ppb
2015-01-1426.0 ppb
2015-01-1437.0 ppb
2015-01-1421.0 ppb
2015-01-1424.0 ppb
2015-04-1419.0 ppb
2015-04-1423.0 ppb
2015-04-1429.0 ppb
2015-04-1424.0 ppb
2015-07-2234.0 ppb
2015-07-2234.0 ppb
2015-07-2237.0 ppb
2015-07-2230.0 ppb
2015-10-1437.0 ppb
2015-10-1444.0 ppb
2015-10-1455.0 ppb
2015-10-1435.0 ppb
2016-01-1937729_16-022879.00 ppb
2016-01-1937729_16-0228621.0 ppb
2016-01-1937729_16-022858.00 ppb
2016-01-1937729_16-0228418.0 ppb
2016-04-1237729_16-1162615.0 ppb
2016-04-1237729_16-1162519.9 ppb
2016-04-1237729_16-1162418.4 ppb
2016-04-1237729_16-1162321.3 ppb
2016-07-1237729_16-2325444.5 ppb
2016-07-1237729_16-2327536.3 ppb
2016-07-1237729_16-2327629.7 ppb
2016-07-1237729_16-2327730.3 ppb
2016-10-0337729_16-3497548.6 ppb
2016-10-0337729_16-3497643.7 ppb
2016-10-0337729_16-3497744.3 ppb
2016-10-0337729_16-3497832.2 ppb
2017-01-1137729_17-0125433.7 ppb
2017-01-1137729_17-0125717.6 ppb
2017-01-1137729_17-0125516.0 ppb
2017-01-1137729_17-0125625.5 ppb
2017-04-1137729_17-1208429.0 ppb
2017-04-1137729_17-1208524.0 ppb
2017-04-1137729_17-1208628.3 ppb
2017-04-1137729_17-1208719.3 ppb
2017-07-1937729_17-2550126.1 ppb
2017-07-1937729_17-2550029.7 ppb
2017-07-1937729_17-2549939.0 ppb
2017-07-1937729_17-2549823.2 ppb
2017-10-1637729_17-3919046.3 ppb
2017-10-1637729_17-3919244.4 ppb
2017-10-1637729_17-3919338.4 ppb
2017-10-1637729_17-3919435.4 ppb
2018-02-0637729_18-04627 11.1 ppb
2018-02-0637729_18-04626 18.4 ppb
2018-02-0637729_18-04625 11.6 ppb
2018-02-0637729_18-04624 23.7 ppb
2018-04-1037729_18-14169 15.2 ppb
2018-04-1037729_18-14164 22.6 ppb
2018-04-1037729_18-14167 16.0 ppb
2018-04-1037729_18-14168 22.2 ppb
2018-07-1037729_18-28205 22.6 ppb
2018-07-1037729_18-28204 30.4 ppb
2018-07-1037729_18-28203 26.9 ppb
2018-07-1037729_18-28200 28.7 ppb
2018-10-0237729_18-40791 27.0 ppb
2018-10-0237729_18-40793 38.0 ppb
2018-10-0237729_18-40794 32.0 ppb
2018-10-0237729_18-40795 44.0 ppb
2019-01-0837729_19-01136 10.9 ppb
2019-01-0837729_19-01137 18.3 ppb
2019-01-0837729_19-01138 11.0 ppb
2019-01-0837729_19-01139 20.9 ppb
2019-04-1037729_19-15101 14.2 ppb
2019-04-1037729_19-15104 10.5 ppb
2019-04-1037729_19-15103 17.8 ppb
2019-04-1037729_19-15102 13.2 ppb
2019-07-1037729_19-29053 28.0 ppb
2019-07-1037729_19-29055 21.0 ppb
2019-07-1037729_19-29054 28.0 ppb
2019-07-1037729_19-29050 32.0 ppb
2019-10-1637729_19-44930 20.8 ppb
2019-10-1637729_19-44929 29.5 ppb
2019-10-1637729_19-44928 29.4 ppb
2019-10-1637729_19-44927 28.3 ppb