Chloroform
Clayton County Water Authority
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 | 31.2 ppb | 50 | 50 | 8.50 ppb - 72.0 ppb |
2015 | 33.6 ppb | 50 | 50 | 6.10 ppb - 74.0 ppb |
2016 | 30.9 ppb | 50 | 50 | 10.00 ppb - 66.0 ppb |
2017 | 35.6 ppb | 50 | 50 | 14.0 ppb - 78.0 ppb |
2018 | 28.3 ppb | 50 | 50 | 8.80 ppb - 69.0 ppb |
2019 | 33.7 ppb | 50 | 50 | 10.00 ppb - 99.0 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 |
---|---|---|
2014-01-15 | AI26687 | 72.0 ppb |
2014-01-15 | AI26688 | 35.0 ppb |
2014-01-15 | AI26689 | 31.0 ppb |
2014-01-15 | AI26690 | 32.0 ppb |
2014-01-15 | AI26691 | 28.0 ppb |
2014-01-15 | AI26692 | 14.0 ppb |
2014-01-15 | AI26693 | 23.0 ppb |
2014-01-15 | AI26694 | 16.0 ppb |
2014-01-15 | AI26695 | 15.0 ppb |
2014-01-15 | AI26696 | 15.0 ppb |
2014-01-15 | AI26697 | 17.0 ppb |
2014-01-15 | AI26698 | 17.0 ppb |
2014-02-10 | AI27790 | 8.50 ppb |
2014-02-10 | AI27791 | 11.0 ppb |
2014-04-16 | AI38094 | 44.0 ppb |
2014-04-16 | AI38095 | 28.0 ppb |
2014-04-16 | AI38096 | 38.0 ppb |
2014-04-16 | AI38097 | 24.0 ppb |
2014-04-16 | AI38098 | 36.0 ppb |
2014-04-16 | AI38099 | 23.0 ppb |
2014-04-16 | AI38100 | 29.0 ppb |
2014-04-16 | AI38101 | 22.0 ppb |
2014-04-16 | AI38102 | 18.0 ppb |
2014-04-16 | AI38103 | 26.0 ppb |
2014-04-16 | AI38104 | 20.0 ppb |
2014-04-16 | AI38105 | 22.0 ppb |
2014-07-15 | AI45939 | 57.0 ppb |
2014-07-15 | AI45940 | 41.0 ppb |
2014-07-15 | AI45941 | 51.0 ppb |
2014-07-15 | AI45942 | 40.0 ppb |
2014-07-15 | AI45943 | 43.0 ppb |
2014-07-15 | AI45944 | 35.0 ppb |
2014-07-15 | AI45945 | 42.0 ppb |
2014-07-15 | AI45946 | 37.0 ppb |
2014-07-15 | AI45947 | 25.0 ppb |
2014-07-15 | AI45948 | 41.0 ppb |
2014-07-15 | AI45949 | 31.0 ppb |
2014-07-15 | AI45950 | 24.0 ppb |
2014-10-21 | AI57933 | 51.0 ppb |
2014-10-21 | AI57934 | 54.0 ppb |
2014-10-21 | AI57935 | 49.0 ppb |
2014-10-21 | AI57936 | 29.0 ppb |
2014-10-21 | AI57937 | 53.0 ppb |
2014-10-21 | AI57938 | 23.0 ppb |
2014-10-21 | AI57939 | 31.0 ppb |
2014-10-21 | AI57940 | 25.0 ppb |
2014-10-21 | AI57941 | 18.0 ppb |
2014-10-21 | AI57942 | 45.0 ppb |
2014-10-21 | AI57943 | 23.0 ppb |
2014-10-21 | AI57944 | 25.0 ppb |
2015-01-22 | AI63351 | 30.0 ppb |
2015-01-22 | AI63352 | 23.0 ppb |
2015-01-22 | AI63353 | 21.0 ppb |
2015-01-22 | AI63354 | 19.0 ppb |
2015-01-22 | AI63355 | 29.0 ppb |
2015-01-22 | AI63356 | 15.0 ppb |
2015-01-22 | AI63357 | 18.0 ppb |
2015-01-22 | AI63358 | 14.0 ppb |
2015-01-22 | AI63359 | 17.0 ppb |
2015-01-22 | AI63360 | 15.0 ppb |
2015-01-22 | AI63361 | 15.0 ppb |
2015-01-22 | AI63362 | 15.0 ppb |
2015-02-17 | AI64997 | 6.10 ppb |
2015-02-17 | AI64998 | 9.30 ppb |
2015-04-16 | AI75064 | 46.0 ppb |
2015-04-16 | AI75065 | 40.0 ppb |
2015-04-16 | AI75066 | 74.0 ppb |
2015-04-16 | AI75067 | 41.0 ppb |
2015-04-16 | AI75068 | 44.0 ppb |
2015-04-16 | AI75069 | 28.0 ppb |
2015-04-16 | AI75070 | 44.0 ppb |
2015-04-16 | AI75071 | 35.0 ppb |
2015-04-16 | AI75072 | 34.0 ppb |
2015-04-16 | AI75073 | 26.0 ppb |
2015-04-16 | AI75074 | 32.0 ppb |
2015-04-16 | AI75075 | 34.0 ppb |
2015-07-09 | AI82423 | 52.0 ppb |
2015-07-09 | AI82424 | 47.0 ppb |
2015-07-09 | AI82425 | 52.0 ppb |
2015-07-09 | AI82426 | 48.0 ppb |
2015-07-09 | AI82427 | 46.0 ppb |
2015-07-09 | AI82428 | 32.0 ppb |
2015-07-09 | AI82429 | 47.0 ppb |
2015-07-09 | AI82430 | 39.0 ppb |
2015-07-09 | AI82431 | 31.0 ppb |
2015-07-09 | AI82432 | 57.0 ppb |
2015-07-09 | AI82433 | 27.0 ppb |
2015-07-09 | AI82434 | 40.0 ppb |
2015-10-13 | AI92841 | 49.0 ppb |
2015-10-13 | AI92842 | 41.0 ppb |
2015-10-13 | AI92843 | 38.0 ppb |
2015-10-13 | AI92844 | 46.0 ppb |
2015-10-13 | AI92845 | 45.0 ppb |
2015-10-13 | AI92846 | 27.0 ppb |
2015-10-13 | AI92847 | 37.0 ppb |
2015-10-13 | AI92848 | 37.0 ppb |
2015-10-13 | AI92849 | 24.0 ppb |
2015-10-13 | AI92850 | 28.0 ppb |
2015-10-13 | AI92851 | 30.0 ppb |
2015-10-13 | AI92852 | 37.0 ppb |
2016-01-19 | AJ04614 | 46.0 ppb |
2016-01-19 | AJ04615 | 21.0 ppb |
2016-01-19 | AJ04616 | 35.0 ppb |
2016-01-19 | AJ04617 | 19.0 ppb |
2016-01-19 | AJ04618 | 36.0 ppb |
2016-01-19 | AJ04619 | 18.0 ppb |
2016-01-19 | AJ04620 | 19.0 ppb |
2016-01-19 | AJ04621 | 20.0 ppb |
2016-01-19 | AJ04622 | 15.0 ppb |
2016-01-19 | AJ04623 | 18.0 ppb |
2016-01-19 | AJ04624 | 16.0 ppb |
2016-01-19 | AJ04625 | 17.0 ppb |
2016-02-05 | AJ05932 | 10.00 ppb |
2016-02-05 | AJ05933 | 14.0 ppb |
2016-04-19 | AJ10523 | 66.0 ppb |
2016-04-19 | AJ10524 | 35.0 ppb |
2016-04-19 | AJ10525 | 39.0 ppb |
2016-04-19 | AJ10526 | 26.0 ppb |
2016-04-19 | AJ10527 | 27.0 ppb |
2016-04-19 | AJ10528 | 19.0 ppb |
2016-04-19 | AJ10529 | 26.0 ppb |
2016-04-19 | AJ10530 | 24.0 ppb |
2016-04-19 | AJ10531 | 16.0 ppb |
2016-04-19 | AJ10532 | 25.0 ppb |
2016-04-19 | AJ10533 | 20.0 ppb |
2016-04-19 | AJ10534 | 22.0 ppb |
2016-07-20 | AJ18682 | 62.0 ppb |
2016-07-20 | AJ18683 | 48.0 ppb |
2016-07-20 | AJ18684 | 55.0 ppb |
2016-07-20 | AJ18685 | 48.0 ppb |
2016-07-20 | AJ18686 | 41.0 ppb |
2016-07-20 | AJ18687 | 37.0 ppb |
2016-07-20 | AJ18688 | 41.0 ppb |
2016-07-20 | AJ18689 | 47.0 ppb |
2016-07-20 | AJ18690 | 26.0 ppb |
2016-07-20 | AJ18691 | 39.0 ppb |
2016-07-20 | AJ18692 | 29.0 ppb |
2016-07-20 | AJ18693 | 44.0 ppb |
2016-10-18 | AJ31714 | 41.0 ppb |
2016-10-18 | AJ31715 | 37.0 ppb |
2016-10-18 | AJ31716 | 30.0 ppb |
2016-10-18 | AJ31717 | 49.0 ppb |
2016-10-18 | AJ31718 | 20.0 ppb |
2016-10-18 | AJ31719 | 27.0 ppb |
2016-10-18 | AJ31720 | 32.0 ppb |
2016-10-18 | AJ31721 | 32.0 ppb |
2016-10-18 | AJ31722 | 23.0 ppb |
2016-10-18 | AJ31723 | 25.0 ppb |
2016-10-18 | AJ31724 | 31.0 ppb |
2016-10-18 | AJ31725 | 30.0 ppb |
2017-01-18 | AJ40978 | 54.0 ppb |
2017-01-18 | AJ40979 | 38.0 ppb |
2017-01-18 | AJ40980 | 48.0 ppb |
2017-01-18 | AJ40981 | 31.0 ppb |
2017-01-18 | AJ40982 | 35.0 ppb |
2017-01-18 | AJ40983 | 16.0 ppb |
2017-01-18 | AJ40984 | 21.0 ppb |
2017-01-18 | AJ40985 | 21.0 ppb |
2017-01-18 | AJ40986 | 14.0 ppb |
2017-01-18 | AJ40987 | 16.0 ppb |
2017-01-18 | AJ40988 | 19.0 ppb |
2017-01-18 | AJ40989 | 21.0 ppb |
2017-04-18 | AJ53560 | 24.0 ppb |
2017-04-18 | AJ53561 | 19.0 ppb |
2017-04-18 | AJ53562 | 45.0 ppb |
2017-04-18 | AJ53563 | 38.0 ppb |
2017-04-18 | AJ53564 | 26.0 ppb |
2017-04-18 | AJ53565 | 27.0 ppb |
2017-04-18 | AJ53566 | 22.0 ppb |
2017-04-18 | AJ53567 | 22.0 ppb |
2017-04-18 | AJ53621 | 78.0 ppb |
2017-04-18 | AJ53622 | 70.0 ppb |
2017-04-18 | AJ53623 | 31.0 ppb |
2017-04-18 | AJ53624 | 33.0 ppb |
2017-04-18 | AJ53625 | 26.0 ppb |
2017-04-18 | AJ53626 | 29.0 ppb |
2017-07-20 | AJ61172 | 74.0 ppb |
2017-07-20 | AJ61173 | 58.0 ppb |
2017-07-20 | AJ61174 | 70.0 ppb |
2017-07-20 | AJ61175 | 51.0 ppb |
2017-07-20 | AJ61176 | 44.0 ppb |
2017-07-20 | AJ61177 | 41.0 ppb |
2017-07-20 | AJ61178 | 46.0 ppb |
2017-07-20 | AJ61179 | 40.0 ppb |
2017-07-20 | AJ61180 | 26.0 ppb |
2017-07-20 | AJ61181 | 59.0 ppb |
2017-07-20 | AJ61182 | 41.0 ppb |
2017-07-20 | AJ61183 | 27.0 ppb |
2017-10-26 | AJ72485 | 45.0 ppb |
2017-10-26 | AJ72486 | 39.0 ppb |
2017-10-26 | AJ72487 | 39.0 ppb |
2017-10-26 | AJ72488 | 28.0 ppb |
2017-10-26 | AJ72489 | 47.0 ppb |
2017-10-26 | AJ72490 | 27.0 ppb |
2017-10-26 | AJ72491 | 28.0 ppb |
2017-10-26 | AJ72492 | 25.0 ppb |
2017-10-26 | AJ72493 | 18.0 ppb |
2017-10-26 | AJ72494 | 34.0 ppb |
2017-10-26 | AJ72495 | 26.0 ppb |
2017-10-26 | AJ72496 | 21.0 ppb |
2018-01-23 | AJ76906 | 25.0 ppb |
2018-01-23 | AJ76907 | 11.0 ppb |
2018-01-23 | AJ76908 | 20.0 ppb |
2018-01-23 | AJ76909 | 13.0 ppb |
2018-01-23 | AJ76910 | 22.0 ppb |
2018-01-23 | AJ76911 | 12.0 ppb |
2018-01-23 | AJ76912 | 12.0 ppb |
2018-01-23 | AJ76913 | 11.0 ppb |
2018-01-23 | AJ76914 | 8.80 ppb |
2018-01-23 | AJ76915 | 11.0 ppb |
2018-01-23 | AJ76916 | 9.10 ppb |
2018-01-23 | AJ76917 | 11.0 ppb |
2018-02-01 | AJ82950 | 11.0 ppb |
2018-02-01 | AJ82951 | 14.0 ppb |
2018-04-11 | AJ87276 | 38.0 ppb |
2018-04-11 | AJ87277 | 37.0 ppb |
2018-04-11 | AJ87278 | 26.0 ppb |
2018-04-11 | AJ87279 | 25.0 ppb |
2018-04-11 | AJ87280 | 20.0 ppb |
2018-04-11 | AJ87281 | 17.0 ppb |
2018-04-11 | AJ87282 | 26.0 ppb |
2018-04-11 | AJ87283 | 20.0 ppb |
2018-04-11 | AJ87284 | 14.0 ppb |
2018-04-11 | AJ87285 | 17.0 ppb |
2018-04-11 | AJ87286 | 17.0 ppb |
2018-04-11 | AJ87287 | 16.0 ppb |
2018-07-18 | AJ94724 | 64.0 ppb |
2018-07-18 | AJ94725 | 58.0 ppb |
2018-07-18 | AJ94726 | 53.0 ppb |
2018-07-18 | AJ94727 | 43.0 ppb |
2018-07-18 | AJ94728 | 69.0 ppb |
2018-07-18 | AJ94729 | 33.0 ppb |
2018-07-18 | AJ94730 | 49.0 ppb |
2018-07-18 | AJ94731 | 36.0 ppb |
2018-07-18 | AJ94732 | 28.0 ppb |
2018-07-18 | AJ94733 | 44.0 ppb |
2018-07-18 | AJ94734 | 31.0 ppb |
2018-07-18 | AJ94735 | 38.0 ppb |
2018-10-18 | AK04397 | 69.0 ppb |
2018-10-18 | AK04398 | 26.0 ppb |
2018-10-18 | AK04399 | 51.0 ppb |
2018-10-18 | AK04400 | 24.0 ppb |
2018-10-18 | AK04401 | 51.0 ppb |
2018-10-18 | AK04402 | 31.0 ppb |
2018-10-18 | AK04403 | 29.0 ppb |
2018-10-18 | AK04404 | 26.0 ppb |
2018-10-18 | AK04405 | 19.0 ppb |
2018-10-18 | AK04406 | 36.0 ppb |
2018-10-18 | AK04407 | 20.0 ppb |
2018-10-18 | AK04408 | 21.0 ppb |
2019-01-23 | AK09895 | 31.0 ppb |
2019-01-23 | AK09896 | 19.0 ppb |
2019-01-23 | AK09897 | 19.0 ppb |
2019-01-23 | AK09898 | 17.0 ppb |
2019-01-23 | AK09899 | 15.0 ppb |
2019-01-23 | AK09900 | 13.0 ppb |
2019-01-23 | AK09901 | 18.0 ppb |
2019-01-23 | AK09902 | 15.0 ppb |
2019-01-23 | AK09903 | 10.00 ppb |
2019-01-23 | AK09904 | 15.0 ppb |
2019-01-23 | AK09905 | 12.0 ppb |
2019-01-23 | AK09906 | 16.0 ppb |
2019-03-06 | AK12718 | 11.0 ppb |
2019-03-06 | AK12719 | 15.0 ppb |
2019-04-16 | AK15260 | 33.0 ppb |
2019-04-16 | AK15261 | 48.0 ppb |
2019-04-16 | AK15262 | 25.0 ppb |
2019-04-16 | AK15263 | 30.0 ppb |
2019-04-16 | AK15264 | 24.0 ppb |
2019-04-16 | AK15265 | 20.0 ppb |
2019-04-16 | AK15266 | 30.0 ppb |
2019-04-16 | AK15267 | 29.0 ppb |
2019-04-16 | AK15268 | 18.0 ppb |
2019-04-16 | AK15269 | 22.0 ppb |
2019-04-16 | AK15270 | 21.0 ppb |
2019-04-16 | AK15271 | 25.0 ppb |
2019-07-16 | AK22472 | 66.0 ppb |
2019-07-16 | AK22473 | 99.0 ppb |
2019-07-16 | AK22474 | 61.0 ppb |
2019-07-16 | AK22475 | 71.0 ppb |
2019-07-16 | AK22476 | 49.0 ppb |
2019-07-16 | AK22477 | 51.0 ppb |
2019-07-16 | AK22478 | 74.0 ppb |
2019-07-16 | AK22479 | 66.0 ppb |
2019-07-16 | AK22480 | 44.0 ppb |
2019-07-16 | AK22481 | 49.0 ppb |
2019-07-16 | AK22482 | 60.0 ppb |
2019-07-16 | AK22483 | 52.0 ppb |
2019-10-22 | AK35434 | 53.0 ppb |
2019-10-22 | AK35435 | 29.0 ppb |
2019-10-22 | AK35436 | 40.0 ppb |
2019-10-22 | AK35437 | 29.0 ppb |
2019-10-22 | AK35438 | 38.0 ppb |
2019-10-22 | AK35439 | 26.0 ppb |
2019-10-22 | AK35440 | 34.0 ppb |
2019-10-22 | AK35441 | 26.0 ppb |
2019-10-22 | AK35442 | 30.0 ppb |
2019-10-22 | AK35443 | 33.0 ppb |
2019-10-22 | AK35444 | 22.0 ppb |
2019-10-22 | AK35445 | 30.0 ppb |