Chloroform
Champlain Water District
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 | 25.1 ppb | 57 | 57 | 11.0 ppb - 39.0 ppb |
2015 | 22.7 ppb | 57 | 57 | 0.800 ppb - 35.0 ppb |
2016 | 21.8 ppb | 57 | 57 | 7.60 ppb - 34.0 ppb |
2017 | 23.9 ppb | 57 | 57 | 8.10 ppb - 37.0 ppb |
2018 | 23.7 ppb | 57 | 56 | ND - 35.0 ppb |
2019 | 24.8 ppb | 57 | 57 | 11.0 ppb - 42.4 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 |
---|---|---|
2014-01-23 | 2962451 | 23.0 ppb |
2014-01-23 | 2962452 | 17.0 ppb |
2014-01-23 | 2962453 | 21.0 ppb |
2014-01-23 | 2962454 | 11.0 ppb |
2014-01-23 | 2962455 | 18.0 ppb |
2014-01-23 | 2962456 | 23.0 ppb |
2014-01-23 | 2962457 | 24.0 ppb |
2014-01-23 | 2962458 | 16.0 ppb |
2014-01-23 | 2962459 | 18.0 ppb |
2014-01-23 | 2962460 | 22.0 ppb |
2014-01-27 | 2964431 | 16.0 ppb |
2014-01-27 | 2964432 | 18.0 ppb |
2014-01-27 | 2964433 | 15.0 ppb |
2014-01-27 | 2964434 | 11.0 ppb |
2014-02-25 | 2981139 | 11.0 ppb |
2014-04-28 | 3015974 | 30.0 ppb |
2014-04-28 | 3015975 | 31.0 ppb |
2014-04-28 | 3015976 | 34.0 ppb |
2014-04-28 | 3015977 | 30.0 ppb |
2014-04-28 | 3015978 | 34.0 ppb |
2014-04-28 | 3015979 | 18.0 ppb |
2014-04-28 | 3015980 | 27.0 ppb |
2014-04-28 | 3015981 | 29.0 ppb |
2014-04-28 | 3015982 | 37.0 ppb |
2014-04-28 | 3015983 | 39.0 ppb |
2014-04-28 | 3015984 | 25.0 ppb |
2014-04-28 | 3015985 | 30.0 ppb |
2014-04-28 | 3015986 | 37.0 ppb |
2014-04-28 | 3015987 | 30.0 ppb |
2014-07-29 | 3071819 | 31.0 ppb |
2014-07-29 | 3071820 | 31.0 ppb |
2014-07-29 | 3071821 | 26.0 ppb |
2014-07-29 | 3071822 | 25.0 ppb |
2014-07-29 | 3071823 | 29.0 ppb |
2014-07-29 | 3071824 | 18.0 ppb |
2014-07-29 | 3071825 | 25.0 ppb |
2014-07-29 | 3071826 | 25.0 ppb |
2014-07-29 | 3071827 | 31.0 ppb |
2014-07-29 | 3071829 | 22.0 ppb |
2014-07-29 | 3071830 | 27.0 ppb |
2014-07-29 | 3071831 | 29.0 ppb |
2014-07-29 | 3071832 | 21.0 ppb |
2014-07-29 | 3071828 | 35.0 ppb |
2014-10-28 | 3129906 | 27.0 ppb |
2014-10-28 | 3129907 | 24.0 ppb |
2014-10-28 | 3129908 | 29.0 ppb |
2014-10-28 | 3129909 | 29.0 ppb |
2014-10-28 | 3129910 | 28.0 ppb |
2014-10-28 | 3129911 | 18.0 ppb |
2014-10-28 | 3129912 | 26.0 ppb |
2014-10-28 | 3129913 | 24.0 ppb |
2014-10-28 | 3129914 | 31.0 ppb |
2014-10-28 | 3129915 | 33.0 ppb |
2014-10-28 | 3129916 | 22.0 ppb |
2014-10-28 | 3129917 | 24.0 ppb |
2014-10-28 | 3129918 | 27.0 ppb |
2014-10-28 | 3129919 | 19.0 ppb |
2015-01-21 | 3174011 | 9.30 ppb |
2015-01-22 | 3175222 | 22.0 ppb |
2015-01-22 | 3175223 | 22.0 ppb |
2015-01-22 | 3175224 | 19.0 ppb |
2015-01-22 | 3175225 | 16.0 ppb |
2015-01-22 | 3175226 | 18.0 ppb |
2015-01-22 | 3175227 | 10.00 ppb |
2015-01-22 | 3175228 | 20.0 ppb |
2015-01-22 | 3175229 | 0.800 ppb |
2015-01-22 | 3175230 | 19.0 ppb |
2015-01-22 | 3175231 | 15.0 ppb |
2015-01-22 | 3175232 | 14.0 ppb |
2015-01-22 | 3175233 | 16.0 ppb |
2015-01-22 | 3175234 | 19.0 ppb |
2015-01-22 | 3175235 | 17.0 ppb |
2015-04-23 | 3230498 | 26.0 ppb |
2015-04-23 | 3230499 | 26.0 ppb |
2015-04-23 | 3230500 | 29.0 ppb |
2015-04-23 | 3230501 | 29.0 ppb |
2015-04-23 | 3230502 | 27.0 ppb |
2015-04-23 | 3230503 | 18.0 ppb |
2015-04-23 | 3230504 | 28.0 ppb |
2015-04-23 | 3230505 | 29.0 ppb |
2015-04-23 | 3230506 | 35.0 ppb |
2015-04-23 | 3230507 | 26.0 ppb |
2015-04-23 | 3230508 | 26.0 ppb |
2015-04-23 | 3230510 | 32.0 ppb |
2015-04-23 | 3230511 | 26.0 ppb |
2015-04-23 | 3230509 | 27.0 ppb |
2015-07-08 | 3275938 | 24.0 ppb |
2015-07-08 | 3275939 | 33.0 ppb |
2015-07-08 | 3275940 | 23.0 ppb |
2015-07-08 | 3275941 | 26.0 ppb |
2015-07-08 | 3275942 | 24.0 ppb |
2015-07-08 | 3275944 | 28.0 ppb |
2015-07-08 | 3275945 | 21.0 ppb |
2015-07-08 | 3275946 | 28.0 ppb |
2015-07-08 | 3275947 | 20.0 ppb |
2015-07-08 | 3275948 | 20.0 ppb |
2015-07-08 | 3275949 | 21.0 ppb |
2015-07-08 | 3275950 | 26.0 ppb |
2015-07-08 | 3275951 | 23.0 ppb |
2015-07-08 | 3275943 | 15.0 ppb |
2015-10-08 | 3337439 | 28.0 ppb |
2015-10-08 | 3337440 | 21.0 ppb |
2015-10-08 | 3337441 | 27.0 ppb |
2015-10-08 | 3337442 | 22.0 ppb |
2015-10-08 | 3337443 | 26.0 ppb |
2015-10-08 | 3337444 | 19.0 ppb |
2015-10-08 | 3337445 | 22.0 ppb |
2015-10-08 | 3337446 | 25.0 ppb |
2015-10-08 | 3337447 | 26.0 ppb |
2015-10-08 | 3337448 | 27.0 ppb |
2015-10-08 | 3337449 | 24.0 ppb |
2015-10-08 | 3337450 | 26.0 ppb |
2015-10-08 | 3337451 | 25.0 ppb |
2015-10-08 | 3337452 | 21.0 ppb |
2016-01-28 | 3392393 | 19.0 ppb |
2016-01-28 | 3392394 | 22.0 ppb |
2016-01-28 | 3392395 | 27.0 ppb |
2016-01-28 | 3392396 | 19.0 ppb |
2016-01-28 | 356782 | 20.0 ppb |
2016-01-28 | 3392398 | 12.0 ppb |
2016-01-28 | 3392399 | 21.0 ppb |
2016-01-28 | 3392400 | 18.0 ppb |
2016-01-28 | 3392401 | 21.0 ppb |
2016-01-28 | 3392402 | 15.0 ppb |
2016-01-28 | 3392403 | 14.0 ppb |
2016-01-28 | 3392404 | 17.0 ppb |
2016-01-28 | 3392405 | 19.0 ppb |
2016-01-28 | 3392406 | 18.0 ppb |
2016-02-03 | 3394992 | 7.60 ppb |
2016-04-14 | 3431464 | 19.0 ppb |
2016-04-14 | 3431466 | 23.0 ppb |
2016-04-14 | 3431467 | 19.0 ppb |
2016-04-14 | 3431468 | 22.0 ppb |
2016-04-14 | 3431469 | 12.0 ppb |
2016-04-14 | 3431470 | 21.0 ppb |
2016-04-14 | 3431471 | 19.0 ppb |
2016-04-14 | 3431472 | 23.0 ppb |
2016-04-14 | 3431473 | 17.0 ppb |
2016-04-14 | 3431474 | 17.0 ppb |
2016-04-14 | 3431475 | 18.0 ppb |
2016-04-14 | 3431476 | 22.0 ppb |
2016-04-14 | 3431477 | 19.0 ppb |
2016-04-14 | 3431465 | 21.0 ppb |
2016-07-28 | 3506803 | 26.0 ppb |
2016-07-28 | 3506804 | 31.0 ppb |
2016-07-28 | 3506805 | 26.0 ppb |
2016-07-28 | 3506806 | 22.0 ppb |
2016-07-28 | 3506807 | 24.0 ppb |
2016-07-28 | 3506808 | 18.0 ppb |
2016-07-28 | 3506809 | 26.0 ppb |
2016-07-28 | 3506810 | 28.0 ppb |
2016-07-28 | 3506811 | 32.0 ppb |
2016-07-28 | 3506812 | 25.0 ppb |
2016-07-28 | 3506813 | 22.0 ppb |
2016-07-28 | 3506814 | 32.0 ppb |
2016-07-28 | 3506815 | 34.0 ppb |
2016-07-28 | 3506816 | 24.0 ppb |
2016-10-18 | 3568449 | 26.0 ppb |
2016-10-18 | 3568450 | 25.0 ppb |
2016-10-18 | 3568451 | 26.0 ppb |
2016-10-18 | 3568452 | 25.0 ppb |
2016-10-18 | 3568453 | 23.0 ppb |
2016-10-18 | 3568454 | 17.0 ppb |
2016-10-18 | 3568455 | 25.0 ppb |
2016-10-18 | 3568456 | 24.0 ppb |
2016-10-18 | 3568457 | 26.0 ppb |
2016-10-18 | 3568458 | 23.0 ppb |
2016-10-18 | 3568459 | 21.0 ppb |
2016-10-18 | 3568460 | 24.0 ppb |
2016-10-18 | 3568461 | 27.0 ppb |
2016-10-18 | 3568462 | 21.0 ppb |
2017-01-25 | 3627487 | 8.10 ppb |
2017-02-01 | 3631216 | 16.0 ppb |
2017-02-01 | 3631217 | 18.0 ppb |
2017-02-01 | 3631218 | 22.0 ppb |
2017-02-01 | 3631219 | 15.0 ppb |
2017-02-01 | 3631220 | 19.0 ppb |
2017-02-01 | 3631221 | 10.00 ppb |
2017-02-01 | 3631222 | 18.0 ppb |
2017-02-01 | 3631223 | 16.0 ppb |
2017-02-01 | 3631224 | 19.0 ppb |
2017-02-01 | 3631225 | 13.0 ppb |
2017-02-01 | 3631226 | 12.0 ppb |
2017-02-01 | 3631227 | 15.0 ppb |
2017-02-01 | 3631228 | 17.0 ppb |
2017-02-01 | 3631229 | 16.0 ppb |
2017-04-12 | 3673449 | 22.0 ppb |
2017-04-12 | 3673450 | 21.0 ppb |
2017-04-12 | 3673451 | 20.0 ppb |
2017-04-12 | 3673452 | 22.0 ppb |
2017-04-12 | 3673453 | 23.0 ppb |
2017-04-12 | 3673454 | 17.0 ppb |
2017-04-12 | 3673455 | 22.0 ppb |
2017-04-12 | 3673456 | 21.0 ppb |
2017-04-12 | 3673457 | 25.0 ppb |
2017-04-12 | 3673458 | 22.0 ppb |
2017-04-12 | 3673459 | 21.0 ppb |
2017-04-12 | 3673460 | 24.0 ppb |
2017-04-12 | 3673461 | 24.0 ppb |
2017-04-12 | 3673462 | 20.0 ppb |
2017-07-13 | 3732815 | 30.0 ppb |
2017-07-13 | 3732816 | 33.0 ppb |
2017-07-13 | 3732817 | 28.0 ppb |
2017-07-13 | 3732818 | 24.0 ppb |
2017-07-13 | 3732819 | 27.0 ppb |
2017-07-13 | 3732820 | 17.0 ppb |
2017-07-13 | 3732821 | 31.0 ppb |
2017-07-13 | 3732822 | 28.0 ppb |
2017-07-13 | 3732823 | 34.0 ppb |
2017-07-13 | 3732824 | 28.0 ppb |
2017-07-13 | 3732825 | 26.0 ppb |
2017-07-13 | 3732826 | 26.0 ppb |
2017-07-13 | 3732827 | 29.0 ppb |
2017-07-13 | 3732828 | 30.0 ppb |
2017-10-05 | 3794607 | 32.0 ppb |
2017-10-05 | 3794608 | 32.0 ppb |
2017-10-05 | 3794609 | 32.0 ppb |
2017-10-05 | 3794610 | 31.0 ppb |
2017-10-05 | 3794611 | 31.0 ppb |
2017-10-05 | 3794612 | 25.0 ppb |
2017-10-05 | 3794613 | 32.0 ppb |
2017-10-05 | 3794614 | 31.0 ppb |
2017-10-05 | 3794615 | 37.0 ppb |
2017-10-05 | 3794616 | 29.0 ppb |
2017-10-05 | 3794617 | 30.0 ppb |
2017-10-05 | 3794618 | 32.0 ppb |
2017-10-05 | 3794619 | 34.0 ppb |
2017-10-05 | 3794620 | 27.0 ppb |
2018-01-11 | 3851741 | 23.0 ppb |
2018-01-11 | 3851742 | 27.0 ppb |
2018-01-11 | 3851743 | 35.0 ppb |
2018-01-11 | 3851744 | 25.0 ppb |
2018-01-11 | 3851745 | 28.0 ppb |
2018-01-11 | 3851746 | 14.0 ppb |
2018-01-11 | 3851747 | 28.0 ppb |
2018-01-11 | 3851748 | 24.0 ppb |
2018-01-11 | 3851749 | 31.0 ppb |
2018-01-11 | 3851750 | 21.0 ppb |
2018-01-11 | 3851751 | 17.0 ppb |
2018-01-11 | 3851752 | 20.0 ppb |
2018-01-11 | 3851753 | 22.0 ppb |
2018-01-11 | 3851754 | 18.0 ppb |
2018-01-23 | 3857475 | ND |
2018-04-02 | 3902174 | 23.0 ppb |
2018-04-02 | 3902175 | 24.0 ppb |
2018-04-02 | 3902176 | 23.0 ppb |
2018-04-02 | 3902177 | 23.0 ppb |
2018-04-02 | 3902178 | 24.0 ppb |
2018-04-02 | 3902179 | 14.0 ppb |
2018-04-02 | 3902180 | 23.0 ppb |
2018-04-02 | 3902181 | 21.0 ppb |
2018-04-02 | 3902182 | 26.0 ppb |
2018-04-02 | 3902183 | 25.0 ppb |
2018-04-02 | 3902184 | 17.0 ppb |
2018-04-02 | 3902185 | 20.0 ppb |
2018-04-02 | 3902186 | 23.0 ppb |
2018-04-02 | 3902187 | 17.0 ppb |
2018-07-09 | 3983302 | 26.0 ppb |
2018-07-09 | 3983303 | 26.0 ppb |
2018-07-09 | 3983304 | 25.0 ppb |
2018-07-09 | 3983305 | 25.0 ppb |
2018-07-09 | 3983306 | 24.0 ppb |
2018-07-09 | 3983307 | 21.0 ppb |
2018-07-09 | 3983308 | 24.0 ppb |
2018-07-09 | 3983309 | 23.0 ppb |
2018-07-09 | 3983310 | 29.0 ppb |
2018-07-09 | 3983311 | 25.0 ppb |
2018-07-09 | 3983312 | 22.0 ppb |
2018-07-09 | 3983313 | 24.0 ppb |
2018-07-09 | 3983314 | 26.0 ppb |
2018-07-09 | 3983315 | 24.0 ppb |
2018-10-04 | 4079574 | 25.0 ppb |
2018-10-04 | 4079576 | 24.0 ppb |
2018-10-04 | 4079578 | 31.0 ppb |
2018-10-04 | 4079580 | 26.0 ppb |
2018-10-04 | 4079582 | 30.0 ppb |
2018-10-04 | 4079584 | 20.0 ppb |
2018-10-04 | 4079586 | 29.0 ppb |
2018-10-04 | 4079588 | 27.0 ppb |
2018-10-04 | 4079590 | 30.0 ppb |
2018-10-04 | 4079592 | 26.0 ppb |
2018-10-04 | 4079594 | 30.0 ppb |
2018-10-04 | 4079596 | 24.0 ppb |
2018-10-04 | 4079598 | 28.0 ppb |
2018-10-04 | 4079600 | 23.0 ppb |
2019-01-15 | 4174434 | 26.0 ppb |
2019-01-15 | 4174435 | 26.0 ppb |
2019-01-15 | 4174436 | 28.0 ppb |
2019-01-15 | 4174437 | 21.0 ppb |
2019-01-15 | 4174438 | 23.0 ppb |
2019-01-15 | 4174439 | 12.0 ppb |
2019-01-15 | 4174440 | 19.0 ppb |
2019-01-15 | 4174441 | 18.0 ppb |
2019-01-15 | 4174443 | 23.0 ppb |
2019-01-15 | 4174442 | 26.0 ppb |
2019-01-15 | 4174444 | 14.0 ppb |
2019-01-15 | 4174445 | 13.0 ppb |
2019-01-15 | 4174446 | 21.0 ppb |
2019-01-15 | 4174447 | 12.0 ppb |
2019-01-15 | 4174328 | 11.0 ppb |
2019-04-10 | 4257128 | 20.0 ppb |
2019-04-10 | 4257129 | 24.0 ppb |
2019-04-10 | 4257130 | 22.0 ppb |
2019-04-10 | 4257132 | 20.0 ppb |
2019-04-10 | 4257133 | 12.0 ppb |
2019-04-10 | 4257134 | 23.0 ppb |
2019-04-10 | 4257135 | 19.0 ppb |
2019-04-10 | 4257136 | 22.0 ppb |
2019-04-10 | 4257137 | 18.0 ppb |
2019-04-10 | 4257139 | 19.0 ppb |
2019-04-10 | 4257140 | 22.0 ppb |
2019-04-10 | 4257141 | 20.0 ppb |
2019-04-17 | 4263993 | 22.0 ppb |
2019-04-17 | 4263994 | 19.0 ppb |
2019-07-16 | 1907-17208-002 | 22.3 ppb |
2019-07-16 | 1907-17208-004 | 25.5 ppb |
2019-07-16 | 1907-17208-006 | 22.4 ppb |
2019-07-16 | 1907-17208-008 | 20.1 ppb |
2019-07-16 | 1907-17208-010 | 23.9 ppb |
2019-07-16 | 1907-17208-012 | 22.0 ppb |
2019-07-16 | 1907-17208-014 | 25.6 ppb |
2019-07-16 | 1907-17208-016 | 24.5 ppb |
2019-07-16 | 1907-17208-018 | 28.2 ppb |
2019-07-16 | 1907-17208-020 | 22.6 ppb |
2019-07-16 | 1907-17208-022 | 22.4 ppb |
2019-07-16 | 1907-17208-024 | 24.4 ppb |
2019-07-16 | 1907-17208-026 | 23.8 ppb |
2019-07-16 | 1907-17208-028 | 22.1 ppb |
2019-10-02 | 1910-25764-002 | 39.5 ppb |
2019-10-02 | 1910-25764-004 | 32.2 ppb |
2019-10-02 | 1910-25764-006 | 37.6 ppb |
2019-10-02 | 1910-25764-008 | 35.1 ppb |
2019-10-02 | 1910-25764-010 | 38.1 ppb |
2019-10-02 | 1910-25764-012 | 34.5 ppb |
2019-10-02 | 1910-25764-014 | 37.6 ppb |
2019-10-02 | 1910-25764-016 | 37.0 ppb |
2019-10-02 | 1910-25764-018 | 42.4 ppb |
2019-10-02 | 1910-25764-020 | 34.3 ppb |
2019-10-02 | 1910-25764-022 | 37.2 ppb |
2019-10-02 | 1910-25764-024 | 37.8 ppb |
2019-10-02 | 1910-25764-026 | 37.3 ppb |
2019-10-02 | 1910-25764-028 | 29.6 ppb |