Chloroform
Chesterfield County Central 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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 24.4 ppb | 52 | 52 | 10.00 ppb - 46.0 ppb |
2015 | 23.5 ppb | 48 | 48 | 8.00 ppb - 40.0 ppb |
2016 | 24.6 ppb | 48 | 48 | 13.0 ppb - 43.0 ppb |
2017 | 25.8 ppb | 49 | 49 | 13.0 ppb - 42.0 ppb |
2018 | 28.4 ppb | 52 | 52 | 6.80 ppb - 63.0 ppb |
2019 | 18.5 ppb | 52 | 52 | 8.80 ppb - 35.0 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 |
---|---|---|
2014-02-11 | 201402120957TTHM | 21.0 ppb |
2014-02-11 | 201402121024TTHM | 16.0 ppb |
2014-02-11 | 201402121022TTHM | 16.0 ppb |
2014-02-11 | 201402120958TTHM | 14.0 ppb |
2014-02-11 | 201402121025TTHM | 13.0 ppb |
2014-02-11 | 201402121023TTHM | 13.0 ppb |
2014-02-11 | 201402121029TTHM | 12.0 ppb |
2014-02-11 | 201402121026TTHM | 12.0 ppb |
2014-02-11 | 201402121030TTHM | 12.0 ppb |
2014-02-11 | 201402121028TTHM | 11.0 ppb |
2014-02-11 | 201402120955TTHM | 11.0 ppb |
2014-02-11 | 201402120956TTHM | 10.00 ppb |
2014-05-14 | 201405150482TTHM | 34.0 ppb |
2014-05-14 | 201405150461TTHM | 33.0 ppb |
2014-05-14 | 201405150463TTHM | 32.0 ppb |
2014-05-14 | 201405150464TTHM | 32.0 ppb |
2014-05-14 | 201405150480TTHM | 32.0 ppb |
2014-05-14 | 201405150481TTHM | 32.0 ppb |
2014-05-14 | 201405150475TTHM | 39.0 ppb |
2014-05-14 | 201405150483TTHM | 37.0 ppb |
2014-05-14 | 201405150476TTHM | 36.0 ppb |
2014-05-14 | 201405150477TTHM | 29.0 ppb |
2014-05-14 | 201405150462TTHM | 28.0 ppb |
2014-05-14 | 201405150465TTHM | 28.0 ppb |
2014-08-12 | 201408130489TTHM | 33.0 ppb |
2014-08-12 | 201408130561TTHM | 40.0 ppb |
2014-08-12 | 201408130562TTHM | 40.0 ppb |
2014-08-12 | 201408130488TTHM | 30.0 ppb |
2014-08-12 | 201408130563TTHM | 29.0 ppb |
2014-08-12 | 201408130249TTHM | 28.0 ppb |
2014-08-12 | 201408130248TTHM | 22.0 ppb |
2014-08-12 | 201408130487TTHM | 22.0 ppb |
2014-08-12 | 201408130246TTHM | 22.0 ppb |
2014-08-12 | 201408130486TTHM | 22.0 ppb |
2014-08-12 | 201408130490TTHM | 20.0 ppb |
2014-08-12 | 201408130247TTHM | 20.0 ppb |
2014-08-22 | E140801006 | 46.0 ppb |
2014-08-22 | E140801007 | 44.0 ppb |
2014-08-22 | E140801008 | 44.0 ppb |
2014-08-22 | E140801005 | 25.0 ppb |
2014-11-12 | 201411130865TTHM | 23.0 ppb |
2014-11-12 | 201411130861TTHM | 23.0 ppb |
2014-11-12 | 201411130860TTHM | 20.0 ppb |
2014-11-12 | 201411130864TTHM | 20.0 ppb |
2014-11-12 | 201411130866TTHM | 19.0 ppb |
2014-11-12 | 201411130868TTHM | 19.0 ppb |
2014-11-12 | 201411130870TTHM | 19.0 ppb |
2014-11-12 | 201411130859TTHM | 19.0 ppb |
2014-11-12 | 201411130871TTHM | 19.0 ppb |
2014-11-12 | 201411130862TTHM | 17.0 ppb |
2014-11-12 | 201411130867TTHM | 16.0 ppb |
2014-11-12 | 201411130869TTHM | 14.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 14.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 13.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 12.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 12.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 11.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 11.0 ppb |
2015-02-11 | 00127_EXP-EUROFI | 10.00 ppb |
2015-02-11 | 00127_EXP-EUROFI | 9.40 ppb |
2015-02-11 | 00127_EXP-EUROFI | 8.70 ppb |
2015-02-11 | 00127_EXP-EUROFI | 8.40 ppb |
2015-02-11 | 00127_EXP-EUROFI | 8.10 ppb |
2015-02-11 | 00127_EXP-EUROFI | 8.00 ppb |
2015-05-12 | 460260-EUROFINS | 38.0 ppb |
2015-05-12 | 460260-EUROFINS | 31.0 ppb |
2015-05-12 | 460260-EUROFINS | 30.0 ppb |
2015-05-12 | 460260-EUROFINS | 28.0 ppb |
2015-05-12 | 460260-EUROFINS | 26.0 ppb |
2015-05-12 | 460260-EUROFINS | 25.0 ppb |
2015-05-12 | 460260-EUROFINS | 24.0 ppb |
2015-05-12 | 460260-EUROFINS | 22.0 ppb |
2015-05-12 | 460260-EUROFINS | 22.0 ppb |
2015-05-12 | 460260-EUROFINS | 21.0 ppb |
2015-05-12 | 460260-EUROFINS | 21.0 ppb |
2015-05-12 | 460260-EUROFINS | 20.0 ppb |
2015-08-12 | 460260-EUROFINS | 36.0 ppb |
2015-08-12 | 460260-EUROFINS | 34.0 ppb |
2015-08-12 | 460260-EUROFINS | 33.0 ppb |
2015-08-12 | 460260-EUROFINS | 32.0 ppb |
2015-08-12 | 460260-EUROFINS | 30.0 ppb |
2015-08-12 | 460260-EUROFINS | 29.0 ppb |
2015-08-12 | 460260-EUROFINS | 29.0 ppb |
2015-08-12 | 460260-EUROFINS | 27.0 ppb |
2015-08-12 | 460260-EUROFINS | 27.0 ppb |
2015-08-12 | 460260-EUROFINS | 24.0 ppb |
2015-08-12 | 460260-EUROFINS | 24.0 ppb |
2015-08-12 | 460260-EUROFINS | 21.0 ppb |
2015-11-11 | 460260-EUROFINS | 40.0 ppb |
2015-11-11 | 460260-EUROFINS | 39.0 ppb |
2015-11-11 | 460260-EUROFINS | 38.0 ppb |
2015-11-11 | 460260-EUROFINS | 34.0 ppb |
2015-11-11 | 460260-EUROFINS | 30.0 ppb |
2015-11-11 | 460260-EUROFINS | 28.0 ppb |
2015-11-11 | 460260-EUROFINS | 25.0 ppb |
2015-11-11 | 460260-EUROFINS | 24.0 ppb |
2015-11-11 | 460260-EUROFINS | 24.0 ppb |
2015-11-11 | 460260-EUROFINS | 23.0 ppb |
2015-11-11 | 460260-EUROFINS | 22.0 ppb |
2015-11-11 | 460260-EUROFINS | 20.0 ppb |
2016-02-09 | 201602110059TTHM | 20.0 ppb |
2016-02-09 | 201602100509TTHM | 19.0 ppb |
2016-02-09 | 201602100510TTHM | 19.0 ppb |
2016-02-09 | 201602100613TTHM | 18.0 ppb |
2016-02-09 | 201602100614TTHM | 16.0 ppb |
2016-02-09 | 201602110056TTHM | 15.0 ppb |
2016-02-09 | 201602100612TTHM | 15.0 ppb |
2016-02-09 | 201602110057TTHM | 14.0 ppb |
2016-02-09 | 201602110058TTHM | 14.0 ppb |
2016-02-09 | 201602100511TTHM | 14.0 ppb |
2016-02-09 | 201602100610TTHM | 13.0 ppb |
2016-02-09 | 201602100611TTHM | 13.0 ppb |
2016-05-10 | 201605110490TTHM | 33.0 ppb |
2016-05-10 | 201605110699TTHM | 29.0 ppb |
2016-05-10 | 201605110729TTHM | 25.0 ppb |
2016-05-10 | 201605110698TTHM | 23.0 ppb |
2016-05-10 | 201605110697TTHM | 22.0 ppb |
2016-05-10 | 201605110700TTHM | 22.0 ppb |
2016-05-10 | 201605110701TTHM | 22.0 ppb |
2016-05-10 | 201605110489TTHM | 19.0 ppb |
2016-05-10 | 201605110730TTHM | 19.0 ppb |
2016-05-10 | 201605110731TTHM | 18.0 ppb |
2016-05-10 | 201605110487TTHM | 16.0 ppb |
2016-05-10 | 201605110488TTHM | 16.0 ppb |
2016-08-09 | 201608100670TTHM | 43.0 ppb |
2016-08-09 | 201608100671TTHM | 39.0 ppb |
2016-08-09 | 201608100776TTHM | 39.0 ppb |
2016-08-09 | 201608100777TTHM | 34.0 ppb |
2016-08-09 | 201608100780TTHM | 34.0 ppb |
2016-08-09 | 201608100683TTHM | 32.0 ppb |
2016-08-09 | 201608100778TTHM | 28.0 ppb |
2016-08-09 | 201608100779TTHM | 28.0 ppb |
2016-08-09 | 201608100672TTHM | 22.0 ppb |
2016-08-09 | 201608100682TTHM | 22.0 ppb |
2016-08-09 | 201608100680TTHM | 21.0 ppb |
2016-08-09 | 201608100681TTHM | 20.0 ppb |
2016-11-08 | 201611100302TTHM | 38.0 ppb |
2016-11-08 | 201611100510TTHM | 37.0 ppb |
2016-11-08 | 201611100304TTHM | 36.0 ppb |
2016-11-08 | 201611100303TTHM | 35.0 ppb |
2016-11-08 | 201611100305TTHM | 35.0 ppb |
2016-11-08 | 201611100309TTHM | 34.0 ppb |
2016-11-08 | 201611100310TTHM | 32.0 ppb |
2016-11-08 | 201611100509TTHM | 32.0 ppb |
2016-11-08 | 201611100508TTHM | 25.0 ppb |
2016-11-08 | 201611100311TTHM | 22.0 ppb |
2016-11-08 | 201611100307TTHM | 20.0 ppb |
2016-11-08 | 201611100308TTHM | 19.0 ppb |
2017-02-07 | 201702080869TTHM | 27.0 ppb |
2017-02-07 | 201702080867TTHM | 24.0 ppb |
2017-02-07 | 201702080883TTHM | 24.0 ppb |
2017-02-07 | 201702080870TTHM | 24.0 ppb |
2017-02-07 | 201702090479TTHM | 24.0 ppb |
2017-02-07 | 201702080885TTHM | 22.0 ppb |
2017-02-07 | 201702080868TTHM | 22.0 ppb |
2017-02-07 | 201702090480TTHM | 22.0 ppb |
2017-02-07 | 201702080884TTHM | 20.0 ppb |
2017-02-07 | 201702090481TTHM | 19.0 ppb |
2017-02-07 | 201702090477TTHM | 13.0 ppb |
2017-02-07 | 201702090478TTHM | 13.0 ppb |
2017-04-20 | E170304722 | 24.0 ppb |
2017-05-09 | 201705101018TTHM | 36.0 ppb |
2017-05-09 | 201705101017TTHM | 34.0 ppb |
2017-05-09 | 201705101019TTHM | 33.0 ppb |
2017-05-09 | 201705100777TTHM | 30.0 ppb |
2017-05-09 | 201705100752TTHM | 28.0 ppb |
2017-05-09 | 201705100753TTHM | 28.0 ppb |
2017-05-09 | 201705100750TTHM | 24.0 ppb |
2017-05-09 | 201705100751TTHM | 24.0 ppb |
2017-05-09 | 201705100776TTHM | 21.0 ppb |
2017-05-09 | 201705100774TTHM | 21.0 ppb |
2017-05-09 | 201705100775TTHM | 21.0 ppb |
2017-05-09 | 201705100754TTHM | 21.0 ppb |
2017-08-08 | 201708090886TTHM | 33.0 ppb |
2017-08-08 | 201708091258TTHM | 32.0 ppb |
2017-08-08 | 201708090888TTHM | 31.0 ppb |
2017-08-08 | 201708091257TTHM | 30.0 ppb |
2017-08-08 | 201708090887TTHM | 30.0 ppb |
2017-08-08 | 201708090889TTHM | 30.0 ppb |
2017-08-08 | 201708091233TTHM | 29.0 ppb |
2017-08-08 | 201708091234TTHM | 28.0 ppb |
2017-08-08 | 201708091259TTHM | 27.0 ppb |
2017-08-08 | 201708091232TTHM | 26.0 ppb |
2017-08-08 | 201708091235TTHM | 26.0 ppb |
2017-08-08 | 201708091231TTHM | 24.0 ppb |
2017-11-07 | 201711080592TTHM | 42.0 ppb |
2017-11-07 | 201711080595TTHM | 34.0 ppb |
2017-11-07 | 201711080409TTHM | 28.0 ppb |
2017-11-07 | 201711080591TTHM | 28.0 ppb |
2017-11-07 | 201711080549TTHM | 27.0 ppb |
2017-11-07 | 201711080408TTHM | 27.0 ppb |
2017-11-07 | 201711080407TTHM | 26.0 ppb |
2017-11-07 | 201711080410TTHM | 24.0 ppb |
2017-11-07 | 201711080593TTHM | 24.0 ppb |
2017-11-07 | 201711080548TTHM | 22.0 ppb |
2017-11-07 | 201711080550TTHM | 20.0 ppb |
2017-11-07 | 201711080594TTHM | 19.0 ppb |
2018-02-13 | 201802140696THM | 14.0 ppb |
2018-02-13 | 201802140697THM | 16.0 ppb |
2018-02-13 | 201802140698THM | 11.0 ppb |
2018-02-13 | 201802140699THM | 12.0 ppb |
2018-02-13 | 201802140700THM | 17.0 ppb |
2018-02-13 | 201802140923TTHM | 8.90 ppb |
2018-02-13 | 201802140924TTHM | 8.10 ppb |
2018-02-13 | 201802140925TTHM | 7.20 ppb |
2018-02-13 | 201802150543THM | 7.00 ppb |
2018-02-13 | 201802150544THM | 7.20 ppb |
2018-02-13 | 201802150545THM | 6.80 ppb |
2018-02-13 | 201802150546THM | 10.00 ppb |
2018-05-08 | 201805090980THM | 34.0 ppb |
2018-05-08 | 201805090981THM | 41.0 ppb |
2018-05-08 | 201805090982THM | 41.0 ppb |
2018-05-08 | 201805100278THM | 35.0 ppb |
2018-05-08 | 201805100279THM | 40.0 ppb |
2018-05-08 | 201805100280THM | 42.0 ppb |
2018-05-08 | 201805100281THM | 40.0 ppb |
2018-05-08 | 201805100664THM | 31.0 ppb |
2018-05-08 | 201805100665THM | 31.0 ppb |
2018-05-08 | 201805100666THM | 39.0 ppb |
2018-05-08 | 201805100667THM | 31.0 ppb |
2018-05-08 | 201805100668THM | 28.0 ppb |
2018-06-13 | E180403018 | 56.0 ppb |
2018-06-13 | E180403021 | 30.0 ppb |
2018-06-13 | E180403026 | 37.0 ppb |
2018-06-13 | E180403037 | 39.0 ppb |
2018-08-07 | 201808090747THM | 27.0 ppb |
2018-08-07 | 201808090748THM | 24.0 ppb |
2018-08-07 | 201808090749THM | 24.0 ppb |
2018-08-07 | 201808090750THM | 39.0 ppb |
2018-08-07 | 201808090751THM | 34.0 ppb |
2018-08-07 | 201808090832THM | 36.0 ppb |
2018-08-07 | 201808090833THM | 34.0 ppb |
2018-08-07 | 201808090834THM | 39.0 ppb |
2018-08-07 | 201808090835THM | 58.0 ppb |
2018-08-07 | 201808090899THM | 55.0 ppb |
2018-08-07 | 201808090900THM | 63.0 ppb |
2018-08-07 | 201808090901THM | 53.0 ppb |
2018-11-15 | 201811160135TTHM | 28.0 ppb |
2018-11-15 | 201811160136TTHM | 26.0 ppb |
2018-11-15 | 201811160137TTHM | 20.0 ppb |
2018-11-15 | 201811160140TTHM | 22.0 ppb |
2018-11-15 | 201811160141TTHM | 20.0 ppb |
2018-11-15 | 201811160142TTHM | 22.0 ppb |
2018-11-15 | 201811160143TTHM | 25.0 ppb |
2018-11-15 | 201811160217TTHM | 21.0 ppb |
2018-11-15 | 201811160218TTHM | 21.0 ppb |
2018-11-15 | 201811160219TTHM | 22.0 ppb |
2018-11-15 | 201811160220TTHM | 23.0 ppb |
2018-11-15 | 201811160221TTHM | 20.0 ppb |
2019-03-07 | 201903080133TTHM | 11.0 ppb |
2019-03-07 | 201903080134TTHM | 12.0 ppb |
2019-03-07 | 201903080135TTHM | 13.0 ppb |
2019-03-07 | 201903080136TTHM | 13.0 ppb |
2019-03-07 | 201903080137TTHM | 13.0 ppb |
2019-03-07 | 201903080175TTHM | 11.0 ppb |
2019-03-07 | 201903080176TTHM | 10.00 ppb |
2019-03-07 | 201903080177TTHM | 10.00 ppb |
2019-03-07 | 201903080180TTHM | 10.00 ppb |
2019-03-07 | 201903080181TTHM | 12.0 ppb |
2019-03-07 | 201903080182TTHM | 12.0 ppb |
2019-03-07 | 201903080183TTHM | 10.00 ppb |
2019-05-14 | 2019051050733TTH | 34.0 ppb |
2019-05-14 | 20190510732TTHM | 34.0 ppb |
2019-05-14 | 201905150734TTHM | 14.0 ppb |
2019-05-14 | 201905150750TTHM | 21.0 ppb |
2019-05-14 | 201905150751TTHM | 21.0 ppb |
2019-05-14 | 201905150752TTHM | 8.80 ppb |
2019-05-14 | 201905150753TTHM | 30.0 ppb |
2019-05-14 | 201905150754TTHM | 20.0 ppb |
2019-05-14 | 201905160199TTHM | 15.0 ppb |
2019-05-14 | 201905160200TTHM | 13.0 ppb |
2019-05-14 | 201905160201TTHM | 14.0 ppb |
2019-05-14 | 201905160202TTHM | 32.0 ppb |
2019-05-16 | E190402830 | 21.0 ppb |
2019-05-16 | E190402834 | 25.0 ppb |
2019-05-16 | E190402839 | 12.0 ppb |
2019-05-16 | E190402846 | 14.0 ppb |
2019-08-06 | 201908070748TTHM | 23.0 ppb |
2019-08-06 | 201908070762TTHM | 20.0 ppb |
2019-08-06 | 201908070763TTHM | 21.0 ppb |
2019-08-06 | 201908070764TTHM | 21.0 ppb |
2019-08-06 | 201908070765TTHM | 29.0 ppb |
2019-08-06 | 201908070770TTHM | 30.0 ppb |
2019-08-06 | 201908070771TTHM | 35.0 ppb |
2019-08-06 | 201908070772TTHM | 31.0 ppb |
2019-08-29 | 201908300224TTHM | 31.0 ppb |
2019-08-29 | 201908300225TTHM | 35.0 ppb |
2019-08-29 | 201908300226TTHM | 20.0 ppb |
2019-08-29 | 201908300227TTHM | 30.0 ppb |
2019-11-12 | 201911130312TTHM | 11.0 ppb |
2019-11-12 | 201911130313TTHM | 10.00 ppb |
2019-11-12 | 201911130314TTHM | 10.00 ppb |
2019-11-12 | 201911130315TTHM | 12.0 ppb |
2019-11-12 | 201911130594TTHM | 20.0 ppb |
2019-11-12 | 201911130595TTHM | 20.0 ppb |
2019-11-12 | 201911130596TTHM | 12.0 ppb |
2019-11-12 | 201911130597TTHM | 14.0 ppb |
2019-11-12 | 201911130598TTHM | 22.0 ppb |
2019-11-12 | 201911130599TTHM | 14.0 ppb |
2019-11-12 | 201911130600TTHM | 12.0 ppb |
2019-11-12 | 201911130601TTHM | 12.0 ppb |