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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Wilson

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
2013N/A00N/A
201434.4 ppb32329.00 ppb - 62.2 ppb
201532.1 ppb32328.00 ppb - 67.0 ppb
201639.6 ppb32327.00 ppb - 90.1 ppb
201730.1 ppb32329.02 ppb - 67.1 ppb
201835.9 ppb32326.04 ppb - 83.7 ppb
201930.7 ppb32328.27 ppb - 64.0 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
2014-01-2837729_14-0299616.0 ppb
2014-01-2837729_14-0299712.0 ppb
2014-01-2837729_14-0299822.0 ppb
2014-01-2837729_14-0299911.0 ppb
2014-01-2837729_14-030009.00 ppb
2014-01-2837729_14-0300127.0 ppb
2014-01-2837729_14-0300215.0 ppb
2014-01-2837729_14-0300313.0 ppb
2014-04-1637729_14-1095937.3 ppb
2014-04-1637729_14-1096031.5 ppb
2014-04-1637729_14-1096132.5 ppb
2014-04-1637729_14-1096227.3 ppb
2014-04-1637729_14-1096338.7 ppb
2014-04-1637729_14-1096445.5 ppb
2014-04-1637729_14-1096532.6 ppb
2014-04-1637729_14-1096630.3 ppb
2014-07-2337729_14-2201659.8 ppb
2014-07-2337729_14-2201753.8 ppb
2014-07-2337729_14-2201855.8 ppb
2014-07-2337729_14-2201937.1 ppb
2014-07-2337729_14-2202038.1 ppb
2014-07-2337729_14-2202158.4 ppb
2014-07-2337729_14-2202262.2 ppb
2014-07-2337729_14-2202358.6 ppb
2014-10-1437729_14-3145541.0 ppb
2014-10-1437729_14-3145623.0 ppb
2014-10-1437729_14-3145745.0 ppb
2014-10-1437729_14-3145839.0 ppb
2014-10-1437729_14-3145923.0 ppb
2014-10-1437729_14-3146044.0 ppb
2014-10-1437729_14-3146136.0 ppb
2014-10-1437729_14-3146225.0 ppb
2015-01-1320.0 ppb
2015-01-1318.0 ppb
2015-01-1320.0 ppb
2015-01-1312.0 ppb
2015-01-138.00 ppb
2015-01-1320.0 ppb
2015-01-1314.0 ppb
2015-01-1314.0 ppb
2015-04-1424.8 ppb
2015-04-1422.1 ppb
2015-04-1424.0 ppb
2015-04-1417.6 ppb
2015-04-1415.0 ppb
2015-04-1421.3 ppb
2015-04-1419.0 ppb
2015-04-1423.2 ppb
2015-07-1444.0 ppb
2015-07-1435.0 ppb
2015-07-1444.0 ppb
2015-07-1435.0 ppb
2015-07-1430.0 ppb
2015-07-1451.0 ppb
2015-07-1447.0 ppb
2015-07-1442.0 ppb
2015-10-1363.0 ppb
2015-10-1343.0 ppb
2015-10-1351.0 ppb
2015-10-1327.0 ppb
2015-10-1358.0 ppb
2015-10-1358.0 ppb
2015-10-1338.0 ppb
2015-10-1367.0 ppb
2016-01-1237729_16-0139424.0 ppb
2016-01-1237729_16-0139511.0 ppb
2016-01-1237729_16-0139630.0 ppb
2016-01-1237729_16-013977.00 ppb
2016-01-1237729_16-0139818.0 ppb
2016-01-1237729_16-0139915.0 ppb
2016-01-1237729_16-0140016.0 ppb
2016-01-1237729_16-0140117.0 ppb
2016-04-1337729_16-1173026.3 ppb
2016-04-1337729_16-1173126.0 ppb
2016-04-1337729_16-1173223.5 ppb
2016-04-1337729_16-1173320.2 ppb
2016-04-1337729_16-1173413.0 ppb
2016-04-1337729_16-1173527.7 ppb
2016-04-1337729_16-1173617.2 ppb
2016-04-1337729_16-1173730.6 ppb
2016-07-1237729_16-2311666.7 ppb
2016-07-1237729_16-2311762.5 ppb
2016-07-1237729_16-2312090.1 ppb
2016-07-1237729_16-2312147.7 ppb
2016-07-1237729_16-2312341.2 ppb
2016-07-1237729_16-2312973.6 ppb
2016-07-1237729_16-2313084.8 ppb
2016-07-1237729_16-2313152.9 ppb
2016-10-0637729_16-3514557.9 ppb
2016-10-0637729_16-3514650.3 ppb
2016-10-0637729_16-3514768.3 ppb
2016-10-0637729_16-3514843.8 ppb
2016-10-0637729_16-3514931.9 ppb
2016-10-0637729_16-3515059.5 ppb
2016-10-0637729_16-3515158.9 ppb
2016-10-0637729_16-3515254.1 ppb
2017-01-1137729_17-0141515.8 ppb
2017-01-1137729_17-0141614.5 ppb
2017-01-1137729_17-0141720.9 ppb
2017-01-1137729_17-0141812.4 ppb
2017-01-1137729_17-014199.02 ppb
2017-01-1137729_17-0142124.3 ppb
2017-01-1137729_17-0142215.9 ppb
2017-01-1137729_17-0142312.1 ppb
2017-04-1137729_17-1235727.6 ppb
2017-04-1137729_17-1235818.4 ppb
2017-04-1137729_17-1235922.0 ppb
2017-04-1137729_17-123609.93 ppb
2017-04-1137729_17-1236121.3 ppb
2017-04-1137729_17-1236217.6 ppb
2017-04-1137729_17-1236317.9 ppb
2017-04-1137729_17-1236416.3 ppb
2017-07-1137729_17-2402163.8 ppb
2017-07-1137729_17-2402234.5 ppb
2017-07-1137729_17-2402354.2 ppb
2017-07-1137729_17-2402426.9 ppb
2017-07-1137729_17-2402549.9 ppb
2017-07-1137729_17-2402643.6 ppb
2017-07-1137729_17-2402750.9 ppb
2017-07-1137729_17-2402843.5 ppb
2017-10-1037729_17-3831267.1 ppb
2017-10-1037729_17-3831324.9 ppb
2017-10-1037729_17-3831444.5 ppb
2017-10-1037729_17-3831521.2 ppb
2017-10-1037729_17-3831636.9 ppb
2017-10-1037729_17-3831742.0 ppb
2017-10-1037729_17-3831843.2 ppb
2017-10-1037729_17-3831941.4 ppb
2018-01-1037729_18-01403 23.8 ppb
2018-01-1037729_18-01404 8.15 ppb
2018-01-1037729_18-01405 12.5 ppb
2018-01-1037729_18-01406 6.04 ppb
2018-01-1037729_18-01407 9.55 ppb
2018-01-1037729_18-01408 8.10 ppb
2018-01-1037729_18-01409 7.93 ppb
2018-01-1037729_18-01410 9.78 ppb
2018-04-1037729_18-14234 24.2 ppb
2018-04-1037729_18-14235 27.9 ppb
2018-04-1037729_18-14236 46.0 ppb
2018-04-1037729_18-14237 21.2 ppb
2018-04-1037729_18-14238 17.6 ppb
2018-04-1037729_18-14239 43.8 ppb
2018-04-1037729_18-14240 24.6 ppb
2018-04-1037729_18-14241 23.5 ppb
2018-07-1037729_18-28401 49.4 ppb
2018-07-1037729_18-28404 51.6 ppb
2018-07-1037729_18-28405 83.7 ppb
2018-07-1037729_18-28406 55.4 ppb
2018-07-1037729_18-28407 35.2 ppb
2018-07-1037729_18-28408 80.0 ppb
2018-07-1037729_18-28409 48.2 ppb
2018-07-1037729_18-28410 43.1 ppb
2018-10-1637729_18-43345 61.0 ppb
2018-10-1637729_18-43346 55.0 ppb
2018-10-1637729_18-43347 51.0 ppb
2018-10-1637729_18-43348 36.0 ppb
2018-10-1637729_18-43349 48.0 ppb
2018-10-1637729_18-43350 45.0 ppb
2018-10-1637729_18-43351 38.0 ppb
2018-10-1637729_18-43352 53.0 ppb
2019-01-1537729_19-02481 24.6 ppb
2019-01-1537729_19-02482 11.9 ppb
2019-01-1537729_19-02483 23.5 ppb
2019-01-1537729_19-02484 8.27 ppb
2019-01-1537729_19-02485 17.9 ppb
2019-01-1537729_19-02486 16.7 ppb
2019-01-1537729_19-02487 20.1 ppb
2019-01-1537729_19-02488 24.1 ppb
2019-04-0937729_19-14871 22.4 ppb
2019-04-0937729_19-14872 23.0 ppb
2019-04-0937729_19-14873 19.9 ppb
2019-04-0937729_19-14874 15.4 ppb
2019-04-0937729_19-14875 19.7 ppb
2019-04-0937729_19-14876 18.0 ppb
2019-04-0937729_19-14877 18.7 ppb
2019-04-0937729_19-14878 24.8 ppb
2019-07-0937729_19-28891 48.0 ppb
2019-07-0937729_19-28892 58.0 ppb
2019-07-0937729_19-28893 43.0 ppb
2019-07-0937729_19-28894 43.0 ppb
2019-07-0937729_19-28895 34.0 ppb
2019-07-0937729_19-28896 43.0 ppb
2019-07-0937729_19-28897 51.0 ppb
2019-07-0937729_19-28898 64.0 ppb
2019-10-0837729_19-43915 42.3 ppb
2019-10-0837729_19-43916 31.4 ppb
2019-10-0837729_19-43917 42.0 ppb
2019-10-0837729_19-43918 20.5 ppb
2019-10-0837729_19-43919 41.0 ppb
2019-10-0837729_19-43920 30.3 ppb
2019-10-0837729_19-43921 35.1 ppb
2019-10-0837729_19-43922 46.9 ppb