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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Asheville

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201428.2 ppb32329.00 ppb - 55.0 ppb
201529.3 ppb32328.92 ppb - 70.7 ppb
201625.0 ppb32327.89 ppb - 49.1 ppb
201726.5 ppb323210.6 ppb - 52.1 ppb
201828.1 ppb32328.45 ppb - 58.0 ppb
201928.8 ppb32326.01 ppb - 59.4 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
2014-02-1037729_14-0398819.0 ppb
2014-02-1037729_14-0398921.0 ppb
2014-02-1037729_14-0399016.0 ppb
2014-02-1037729_14-039919.00 ppb
2014-02-1037729_14-0399224.0 ppb
2014-02-1037729_14-0399317.0 ppb
2014-02-1037729_14-0399416.0 ppb
2014-02-1037729_14-0399523.0 ppb
2014-05-0637729_14-1261311.0 ppb
2014-05-0637729_14-1261427.0 ppb
2014-05-0637729_14-1261515.0 ppb
2014-05-0637729_14-1261619.0 ppb
2014-05-0637729_14-1261741.0 ppb
2014-05-0637729_14-1261828.0 ppb
2014-05-0637729_14-1261923.0 ppb
2014-05-0637729_14-1262025.0 ppb
2014-08-0437729_14-2313852.0 ppb
2014-08-0437729_14-2313932.0 ppb
2014-08-0437729_14-2314013.0 ppb
2014-08-0437729_14-2314141.0 ppb
2014-08-0437729_14-2314234.0 ppb
2014-08-0437729_14-2314336.0 ppb
2014-08-0437729_14-2314420.0 ppb
2014-08-0437729_14-2314533.0 ppb
2014-11-0537729_14-3366155.0 ppb
2014-11-0537729_14-3366242.0 ppb
2014-11-0537729_14-3366320.0 ppb
2014-11-0537729_14-3366433.0 ppb
2014-11-0537729_14-3366549.0 ppb
2014-11-0537729_14-3366635.0 ppb
2014-11-0537729_14-3366731.0 ppb
2014-11-0537729_14-3366843.0 ppb
2015-02-0332.2 ppb
2015-02-0321.4 ppb
2015-02-038.92 ppb
2015-02-0317.0 ppb
2015-02-0325.0 ppb
2015-02-0320.5 ppb
2015-02-0322.5 ppb
2015-02-0322.8 ppb
2015-05-1248.0 ppb
2015-05-1226.0 ppb
2015-05-1210.00 ppb
2015-05-1227.0 ppb
2015-05-1224.0 ppb
2015-05-1217.0 ppb
2015-05-1224.0 ppb
2015-05-1224.0 ppb
2015-08-0512.6 ppb
2015-08-0533.5 ppb
2015-08-0530.4 ppb
2015-08-0532.4 ppb
2015-08-0522.3 ppb
2015-08-0570.7 ppb
2015-08-0536.4 ppb
2015-08-0538.0 ppb
2015-11-0354.0 ppb
2015-11-0330.0 ppb
2015-11-0321.0 ppb
2015-11-0346.0 ppb
2015-11-0341.0 ppb
2015-11-0336.0 ppb
2015-11-0326.0 ppb
2015-11-0336.0 ppb
2016-02-0437729_16-0366023.0 ppb
2016-02-0437729_16-0366114.0 ppb
2016-02-0437729_16-036628.00 ppb
2016-02-0437729_16-0366318.0 ppb
2016-02-0437729_16-0366418.0 ppb
2016-02-0437729_16-0366520.0 ppb
2016-02-0437729_16-0366621.0 ppb
2016-02-0437729_16-0366715.0 ppb
2016-05-0237729_16-137667.89 ppb
2016-05-0237729_16-1376730.6 ppb
2016-05-0237729_16-1376825.6 ppb
2016-05-0237729_16-1376915.4 ppb
2016-05-0237729_16-1377031.0 ppb
2016-05-0237729_16-1377120.9 ppb
2016-05-0237729_16-1377222.7 ppb
2016-05-0237729_16-1377320.9 ppb
2016-08-0337729_16-2642342.5 ppb
2016-08-0337729_16-2642536.1 ppb
2016-08-0337729_16-2642612.9 ppb
2016-08-0337729_16-2642749.1 ppb
2016-08-0337729_16-2642828.0 ppb
2016-08-0337729_16-2642925.0 ppb
2016-08-0337729_16-2643022.0 ppb
2016-08-0337729_16-2643136.0 ppb
2016-11-0737729_16-3889322.0 ppb
2016-11-0737729_16-3889442.2 ppb
2016-11-0737729_16-3889524.7 ppb
2016-11-0737729_16-3889627.6 ppb
2016-11-0737729_16-3890036.2 ppb
2016-11-0737729_16-3890133.1 ppb
2016-11-0737729_16-3890827.3 ppb
2016-11-0737729_16-3891424.3 ppb
2017-02-0137729_17-0378022.0 ppb
2017-02-0137729_17-0378119.6 ppb
2017-02-0137729_17-0378214.0 ppb
2017-02-0137729_17-0378320.4 ppb
2017-02-0137729_17-0378422.3 ppb
2017-02-0137729_17-0378519.1 ppb
2017-02-0137729_17-0378616.3 ppb
2017-02-0137729_17-0378717.9 ppb
2017-05-0837729_17-1519522.3 ppb
2017-05-0837729_17-1519621.2 ppb
2017-05-0837729_17-1519710.6 ppb
2017-05-0837729_17-1519833.5 ppb
2017-05-0837729_17-1519922.4 ppb
2017-05-0837729_17-1520020.3 ppb
2017-05-0837729_17-1520125.3 ppb
2017-05-0837729_17-1520224.1 ppb
2017-08-0937729_17-2847124.0 ppb
2017-08-0937729_17-2848120.8 ppb
2017-08-0937729_17-2848212.9 ppb
2017-08-0937729_17-2848345.4 ppb
2017-08-0937729_17-2848423.1 ppb
2017-08-0937729_17-2848519.6 ppb
2017-08-0937729_17-2848628.6 ppb
2017-08-0937729_17-2848728.5 ppb
2017-11-0837729_17-4228145.3 ppb
2017-11-0837729_17-4228234.5 ppb
2017-11-0837729_17-4228317.6 ppb
2017-11-0837729_17-4228452.1 ppb
2017-11-0837729_17-4228545.8 ppb
2017-11-0837729_17-4228640.2 ppb
2017-11-0837729_17-4228740.6 ppb
2017-11-0837729_17-4228836.3 ppb
2018-02-1337729_18-05844 36.2 ppb
2018-02-1337729_18-05845 16.7 ppb
2018-02-1337729_18-05846 8.45 ppb
2018-02-1337729_18-05847 24.9 ppb
2018-02-1337729_18-05848 22.9 ppb
2018-02-1337729_18-05849 22.0 ppb
2018-02-1337729_18-05850 24.3 ppb
2018-02-1337729_18-05851 18.6 ppb
2018-05-0937729_18-18806 30.4 ppb
2018-05-0937729_18-18807 21.5 ppb
2018-05-0937729_18-18808 8.79 ppb
2018-05-0937729_18-18809 33.1 ppb
2018-05-0937729_18-18810 22.8 ppb
2018-05-0937729_18-18811 25.6 ppb
2018-05-0937729_18-18812 16.1 ppb
2018-05-0937729_18-18813 21.9 ppb
2018-08-0637729_18-31982 38.0 ppb
2018-08-0637729_18-31983 33.0 ppb
2018-08-0637729_18-31984 17.0 ppb
2018-08-0637729_18-31985 19.8 ppb
2018-08-0637729_18-31986 38.0 ppb
2018-08-0637729_18-31987 31.4 ppb
2018-08-0637729_18-31988 20.9 ppb
2018-08-0637729_18-31989 34.6 ppb
2018-11-0537729_18-45873 52.0 ppb
2018-11-0537729_18-45874 32.0 ppb
2018-11-0537729_18-45875 19.0 ppb
2018-11-0537729_18-45876 58.0 ppb
2018-11-0537729_18-45877 46.0 ppb
2018-11-0537729_18-45878 35.0 ppb
2018-11-0537729_18-45879 37.0 ppb
2018-11-0537729_18-45880 33.0 ppb
2019-02-0637729_19-05662 24.2 ppb
2019-02-0637729_19-05663 12.0 ppb
2019-02-0637729_19-05664 6.01 ppb
2019-02-0637729_19-05665 13.5 ppb
2019-02-0637729_19-05666 17.4 ppb
2019-02-0637729_19-05667 12.1 ppb
2019-02-0637729_19-05668 12.1 ppb
2019-02-0637729_19-05669 12.1 ppb
2019-05-0637729_19-18135 29.1 ppb
2019-05-0637729_19-18136 22.8 ppb
2019-05-0637729_19-18140 16.1 ppb
2019-05-0637729_19-18141 34.0 ppb
2019-05-0637729_19-18142 22.1 ppb
2019-05-0637729_19-18143 22.9 ppb
2019-05-0637729_19-18144 26.6 ppb
2019-05-0637729_19-18145 25.7 ppb
2019-08-0637729_19-33272 45.4 ppb
2019-08-0637729_19-33273 35.2 ppb
2019-08-0637729_19-33274 19.6 ppb
2019-08-0637729_19-33275 41.5 ppb
2019-08-0637729_19-33276 32.8 ppb
2019-08-0637729_19-33277 26.8 ppb
2019-08-0637729_19-33278 35.4 ppb
2019-08-0637729_19-33279 29.1 ppb
2019-11-0437729_19-47095 59.4 ppb
2019-11-0437729_19-47096 34.4 ppb
2019-11-0437729_19-47097 25.8 ppb
2019-11-0437729_19-47098 54.1 ppb
2019-11-0437729_19-47099 52.6 ppb
2019-11-0437729_19-47100 41.2 ppb
2019-11-0437729_19-47101 39.3 ppb
2019-11-0437729_19-47102 39.8 ppb