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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Greenville Utilities Comm.

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

 

200

Samples

0

Samples exceeding legal limit (MCL)

200

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201414.3 ppb32324.60 ppb - 26.0 ppb
201512.5 ppb32325.00 ppb - 22.1 ppb
201619.5 ppb32325.67 ppb - 43.5 ppb
201713.3 ppb32324.57 ppb - 22.1 ppb
201817.0 ppb40405.31 ppb - 26.1 ppb
201911.2 ppb32324.95 ppb - 17.3 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
2014-03-1037729_14-068156.39 ppb
2014-03-1037729_14-068165.60 ppb
2014-03-1037729_14-068175.62 ppb
2014-03-1037729_14-068184.60 ppb
2014-03-1037729_14-068196.80 ppb
2014-03-1037729_14-068205.61 ppb
2014-03-1037729_14-068215.12 ppb
2014-03-1037729_14-068225.22 ppb
2014-06-0937729_14-1637118.0 ppb
2014-06-0937729_14-1637218.0 ppb
2014-06-0937729_14-1637318.0 ppb
2014-06-0937729_14-1637415.0 ppb
2014-06-0937729_14-1637520.0 ppb
2014-06-0937729_14-1637617.0 ppb
2014-06-0937729_14-1637718.0 ppb
2014-06-0937729_14-1637819.0 ppb
2014-09-0937729_14-2734826.0 ppb
2014-09-0937729_14-2734922.0 ppb
2014-09-0937729_14-2735024.0 ppb
2014-09-0937729_14-2735122.0 ppb
2014-09-0937729_14-2735224.0 ppb
2014-09-0937729_14-2735321.0 ppb
2014-09-0937729_14-2735423.0 ppb
2014-09-0937729_14-2735524.0 ppb
2014-12-1137729_14-3769211.8 ppb
2014-12-1137729_14-376939.53 ppb
2014-12-1137729_14-3769411.3 ppb
2014-12-1137729_14-376957.43 ppb
2014-12-1137729_14-3769612.3 ppb
2014-12-1137729_14-3769710.6 ppb
2014-12-1137729_14-376989.49 ppb
2014-12-1137729_14-3769911.1 ppb
2015-03-127.00 ppb
2015-03-126.00 ppb
2015-03-126.00 ppb
2015-03-125.00 ppb
2015-03-127.00 ppb
2015-03-126.00 ppb
2015-03-126.00 ppb
2015-03-125.00 ppb
2015-06-1619.5 ppb
2015-06-1620.2 ppb
2015-06-1618.0 ppb
2015-06-1618.1 ppb
2015-06-1619.2 ppb
2015-06-1621.1 ppb
2015-06-1617.9 ppb
2015-06-1622.1 ppb
2015-09-0814.8 ppb
2015-09-0815.7 ppb
2015-09-0815.0 ppb
2015-09-0813.1 ppb
2015-09-0816.4 ppb
2015-09-0815.2 ppb
2015-09-0817.5 ppb
2015-09-0819.3 ppb
2015-12-1411.6 ppb
2015-12-147.44 ppb
2015-12-148.58 ppb
2015-12-146.06 ppb
2015-12-1410.5 ppb
2015-12-148.87 ppb
2015-12-147.62 ppb
2015-12-147.85 ppb
2016-03-0737729_16-071338.78 ppb
2016-03-0737729_16-0713610.3 ppb
2016-03-0737729_16-071378.44 ppb
2016-03-0737729_16-071386.18 ppb
2016-03-0737729_16-0713911.8 ppb
2016-03-0737729_16-0714010.3 ppb
2016-03-0737729_16-071415.67 ppb
2016-03-0737729_16-071427.61 ppb
2016-06-0637729_16-1771318.2 ppb
2016-06-0637729_16-1771420.1 ppb
2016-06-0637729_16-1771521.0 ppb
2016-06-0637729_16-1771618.0 ppb
2016-06-0637729_16-1771719.6 ppb
2016-06-0637729_16-1771820.3 ppb
2016-06-0637729_16-1771920.2 ppb
2016-06-0637729_16-1772021.6 ppb
2016-09-1537729_16-3276440.0 ppb
2016-09-1537729_16-3276843.5 ppb
2016-09-1537729_16-3276940.8 ppb
2016-09-1537729_16-3277038.6 ppb
2016-09-1537729_16-3277141.5 ppb
2016-09-1537729_16-3277241.0 ppb
2016-09-1537729_16-3277339.3 ppb
2016-09-1537729_16-3277440.2 ppb
2016-12-1537729_16-4375410.9 ppb
2016-12-1537729_16-437779.54 ppb
2016-12-1537729_16-437789.97 ppb
2016-12-1537729_16-437796.72 ppb
2016-12-1537729_16-437809.77 ppb
2016-12-1537729_16-437817.86 ppb
2016-12-1537729_16-437828.44 ppb
2016-12-1537729_16-437838.19 ppb
2017-03-1637729_17-090209.13 ppb
2017-03-1637729_17-090256.56 ppb
2017-03-1637729_17-090287.43 ppb
2017-03-1637729_17-090294.57 ppb
2017-03-1637729_17-090318.76 ppb
2017-03-1637729_17-090364.98 ppb
2017-03-1637729_17-090396.16 ppb
2017-03-1637729_17-090406.02 ppb
2017-06-1537729_17-2045116.7 ppb
2017-06-1537729_17-2045219.1 ppb
2017-06-1537729_17-2045319.3 ppb
2017-06-1537729_17-2045420.0 ppb
2017-06-1537729_17-2045518.7 ppb
2017-06-1537729_17-2045619.9 ppb
2017-06-1537729_17-2045718.7 ppb
2017-06-1537729_17-2045819.1 ppb
2017-09-0737729_17-3293122.1 ppb
2017-09-0737729_17-3294320.2 ppb
2017-09-0737729_17-3294420.2 ppb
2017-09-0737729_17-3294518.2 ppb
2017-09-0737729_17-3294620.8 ppb
2017-09-0737729_17-3294719.5 ppb
2017-09-0737729_17-3294818.9 ppb
2017-09-0737729_17-3294920.1 ppb
2017-12-1437729_17-476668.23 ppb
2017-12-1437729_17-476677.45 ppb
2017-12-1437729_17-476687.93 ppb
2017-12-1437729_17-476695.18 ppb
2017-12-1437729_17-476708.57 ppb
2017-12-1437729_17-476717.47 ppb
2017-12-1437729_17-476726.62 ppb
2017-12-1437729_17-476738.25 ppb
2018-03-1537729_18-10423 11.1 ppb
2018-03-1537729_18-10424 9.09 ppb
2018-03-1537729_18-10425 7.62 ppb
2018-03-1537729_18-10426 5.31 ppb
2018-03-1537729_18-10427 12.9 ppb
2018-03-1537729_18-10428 5.95 ppb
2018-03-1537729_18-10429 6.03 ppb
2018-03-1537729_18-10430 6.69 ppb
2018-06-0737729_18-22974 24.3 ppb
2018-06-0737729_18-22975 23.1 ppb
2018-06-0737729_18-22976 22.4 ppb
2018-06-0737729_18-22977 20.8 ppb
2018-06-0737729_18-22978 25.7 ppb
2018-06-0737729_18-22979 21.1 ppb
2018-06-0737729_18-22980 20.9 ppb
2018-06-0737729_18-22981 23.0 ppb
2018-09-1037729_18-38431 25.5 ppb
2018-09-1037729_18-38432 24.7 ppb
2018-09-1037729_18-38433 24.1 ppb
2018-09-1037729_18-38434 23.5 ppb
2018-09-1037729_18-38435 26.1 ppb
2018-09-1037729_18-38436 25.6 ppb
2018-09-1037729_18-38437 25.4 ppb
2018-09-1037729_18-38438 24.8 ppb
2018-09-204064434 23.0 ppb
2018-09-204064435 21.0 ppb
2018-09-204064436 21.0 ppb
2018-09-204064437 20.0 ppb
2018-09-204064438 22.0 ppb
2018-09-204064439 21.0 ppb
2018-09-204064440 20.0 ppb
2018-09-204064441 21.0 ppb
2018-12-2037729_18-53506 7.82 ppb
2018-12-2037729_18-53507 8.45 ppb
2018-12-2037729_18-53508 8.07 ppb
2018-12-2037729_18-53509 7.20 ppb
2018-12-2037729_18-53510 9.93 ppb
2018-12-2037729_18-53511 8.14 ppb
2018-12-2037729_18-53512 7.85 ppb
2018-12-2037729_18-53513 7.60 ppb
2019-03-1437729_19-10932 7.84 ppb
2019-03-1437729_19-10943 7.13 ppb
2019-03-1437729_19-10944 6.79 ppb
2019-03-1437729_19-10945 4.95 ppb
2019-03-1437729_19-10946 8.99 ppb
2019-03-1437729_19-10947 6.51 ppb
2019-03-1437729_19-10948 6.46 ppb
2019-03-1437729_19-10949 6.51 ppb
2019-06-0637729_19-23349 13.4 ppb
2019-06-0637729_19-23350 14.5 ppb
2019-06-0637729_19-23351 13.5 ppb
2019-06-0637729_19-23352 12.6 ppb
2019-06-0637729_19-23353 14.4 ppb
2019-06-0637729_19-23354 15.2 ppb
2019-06-0637729_19-23355 15.6 ppb
2019-06-0637729_19-23356 15.1 ppb
2019-09-1237729_19-39499 15.9 ppb
2019-09-1237729_19-39500 16.3 ppb
2019-09-1237729_19-39501 15.6 ppb
2019-09-1237729_19-39502 15.5 ppb
2019-09-1237729_19-39503 16.2 ppb
2019-09-1237729_19-39504 17.0 ppb
2019-09-1237729_19-39505 17.3 ppb
2019-09-1237729_19-39506 16.9 ppb
2019-12-1237729_19-53326 8.57 ppb
2019-12-1237729_19-53327 6.89 ppb
2019-12-1237729_19-53328 7.74 ppb
2019-12-1237729_19-53329 5.49 ppb
2019-12-1237729_19-53330 8.90 ppb
2019-12-1237729_19-53331 6.66 ppb
2019-12-1237729_19-53332 6.44 ppb
2019-12-1237729_19-53333 7.59 ppb