Chloroform
University of Connecticut - Main Campus
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 8.89 ppb | 26 | 24 | ND - 24.6 ppb |
| 2019 | 6.94 ppb | 26 | 24 | ND - 20.3 ppb |
| 2020 | 8.64 ppb | 24 | 23 | ND - 20.3 ppb |
| 2021 | 12.0 ppb | 18 | 16 | ND - 24.9 ppb |
| 2022 | 9.08 ppb | 18 | 16 | ND - 18.0 ppb |
| 2023 | 8.25 ppb | 18 | 16 | ND - 21.0 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.4 ppb
The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-15 | CA02987TTHM | 11.0 ppb |
| 2018-03-15 | CA02988TTHM | 4.50 ppb |
| 2018-03-15 | CA02989TTHM | 16.0 ppb |
| 2018-03-15 | CA02990TTHM | 3.00 ppb |
| 2018-06-12 | CA68568TTHM | 13.0 ppb |
| 2018-06-12 | CA68569TTHM | 11.0 ppb |
| 2018-06-12 | CA68570TTHM | 14.0 ppb |
| 2018-06-12 | CA68571TTHM | 3.00 ppb |
| 2018-09-19 | DBP 200506182 | 14.0 ppb |
| 2018-09-19 | DBP 200506184 | 23.8 ppb |
| 2018-09-19 | DBP 200506186 | 4.40 ppb |
| 2018-09-19 | DBP 200506189 | 6.00 ppb |
| 2018-09-25 | DBP 200506720 | 13.0 ppb |
| 2018-09-25 | DBP 200506721 | 24.6 ppb |
| 2018-09-25 | DBP 200506722 | 4.90 ppb |
| 2018-09-25 | DBP 200506723 | 10.4 ppb |
| 2018-09-26 | DBP 200506966 | 3.80 ppb |
| 2018-09-27 | DBP 200507073 | 10.00 ppb |
| 2018-12-04 | DBP 200514724 | 2.20 ppb |
| 2018-12-04 | DBP 200514725 | 17.8 ppb |
| 2018-12-04 | DBP 200514726 | 3.40 ppb |
| 2018-12-04 | DBP 200514728 | 6.60 ppb |
| 2018-12-12 | VOC1 200515892 | ND |
| 2018-12-12 | VOC1 200515895 | ND |
| 2018-12-17 | DBP 200516281 | 8.20 ppb |
| 2018-12-17 | DBP 200516282 | 2.50 ppb |
| 2019-03-18 | DBP 200525024 | 5.20 ppb |
| 2019-03-18 | DBP 200525026 | 5.30 ppb |
| 2019-03-18 | DBP 200525029 | 4.60 ppb |
| 2019-03-18 | DBP 200525031 | 10.00 ppb |
| 2019-03-18 | DBP 200525033 | 6.10 ppb |
| 2019-03-18 | DBP 200525034 | 2.60 ppb |
| 2019-06-24 | DBP 200537541 | 7.70 ppb |
| 2019-06-24 | DBP 200537542 | 8.40 ppb |
| 2019-06-24 | DBP 200537543 | 4.10 ppb |
| 2019-06-25 | DBP 200537806 | 6.80 ppb |
| 2019-06-25 | DBP 200537807 | 11.7 ppb |
| 2019-06-25 | DBP 200537808 | 19.2 ppb |
| 2019-09-16 | DBP 200549001 | 7.60 ppb |
| 2019-09-16 | DBP 200549002 | 3.00 ppb |
| 2019-09-16 | DBP 200549040 | 6.10 ppb |
| 2019-09-16 | DBP 200549041 | 19.1 ppb |
| 2019-09-16 | DBP 200549043 | 6.20 ppb |
| 2019-09-16 | DBP 200549044 | 3.30 ppb |
| 2019-11-21 | VOC1 200557816 | ND |
| 2019-11-21 | VOC1 200557817 | ND |
| 2019-12-09 | DBP 200559412 | 5.20 ppb |
| 2019-12-09 | DBP 200559416 | 4.00 ppb |
| 2019-12-09 | DBP 200559419 | 3.70 ppb |
| 2019-12-09 | DBP 200559422 | 20.3 ppb |
| 2019-12-09 | DBP 200559425 | 8.20 ppb |
| 2019-12-09 | DBP 200559427 | 2.10 ppb |
| 2020-03-10 | DBP 200568861 | 10.9 ppb |
| 2020-03-10 | DBP 200568862 | 9.10 ppb |
| 2020-03-10 | DBP 200568863 | 4.40 ppb |
| 2020-03-10 | DBP 200568864 | 11.3 ppb |
| 2020-03-10 | DBP 200568865 | 8.80 ppb |
| 2020-03-10 | DBP 200568866 | 2.50 ppb |
| 2020-04-28 | VOC1 200573886 | 0.700 ppb |
| 2020-04-28 | VOC1 200573885 | ND |
| 2020-06-08 | DBP 200578348 | 10.8 ppb |
| 2020-06-08 | DBP 200578349 | 13.6 ppb |
| 2020-06-08 | DBP 200578350 | 4.20 ppb |
| 2020-06-08 | DBP 200578351 | 20.3 ppb |
| 2020-06-08 | DBP 200578352 | 10.1 ppb |
| 2020-06-08 | DBP 200578353 | 3.50 ppb |
| 2020-09-08 | DBP 200589310 | 17.1 ppb |
| 2020-09-08 | DBP 200589311 | 16.7 ppb |
| 2020-09-08 | DBP 200589312 | 7.20 ppb |
| 2020-09-08 | DBP 200589313 | 5.70 ppb |
| 2020-09-08 | DBP 200589314 | 15.4 ppb |
| 2020-09-08 | DBP 200589315 | 3.30 ppb |
| 2020-12-14 | DBP 200601156 | 6.00 ppb |
| 2020-12-14 | DBP 200601157 | 8.60 ppb |
| 2020-12-14 | DBP 200601385 | 11.3 ppb |
| 2020-12-15 | DBP 200601475 | 5.80 ppb |
| 2021-03-10 | DBP 200609379 | 7.70 ppb |
| 2021-03-10 | DBP 200609380 | 6.60 ppb |
| 2021-03-10 | DBP 200609381 | 4.90 ppb |
| 2021-03-10 | DBP 200609382 | 11.2 ppb |
| 2021-06-01 | DBP 200619042 | 21.3 ppb |
| 2021-06-01 | DBP 200619044 | 9.60 ppb |
| 2021-06-01 | DBP 200619046 | 9.20 ppb |
| 2021-06-01 | DBP 200619048 | 23.4 ppb |
| 2021-09-08 | 300054204 300054209 | 17.9 ppb |
| 2021-09-08 | 300054205 300054211 | 11.8 ppb |
| 2021-09-08 | 300054206 300054213 | 5.40 ppb |
| 2021-09-08 | 300054207 300054215 | 24.9 ppb |
| 2021-09-14 | 300059939 300059941 | ND |
| 2021-09-14 | 300059942 300059944 | ND |
| 2021-12-07 | D300114234 300114239 | 16.3 ppb |
| 2021-12-07 | D300114235 300114241 | 5.80 ppb |
| 2021-12-07 | D300114236 300114243 | 15.9 ppb |
| 2021-12-07 | D300114237 300114245 | 24.7 ppb |
| 2022-03-07 | CK80432 | 12.0 ppb |
| 2022-03-07 | CK80433 | 5.50 ppb |
| 2022-03-07 | CK80434 | 11.0 ppb |
| 2022-03-07 | CK80435 | 18.0 ppb |
| 2022-06-02 | CL46810 | 10.00 ppb |
| 2022-06-02 | CL46811 | 5.90 ppb |
| 2022-06-02 | CL46812 | 13.0 ppb |
| 2022-06-02 | CL46813 | 14.0 ppb |
| 2022-09-12 | CM28524 | 11.0 ppb |
| 2022-09-12 | CM28525 | 8.10 ppb |
| 2022-09-12 | CM28526 | 17.0 ppb |
| 2022-09-12 | CM28527 | 10.00 ppb |
| 2022-12-06 | CM98053 | ND |
| 2022-12-06 | CM98054 | ND |
| 2022-12-12 | CN02522 | 7.30 ppb |
| 2022-12-12 | CN02523 | 4.00 ppb |
| 2022-12-12 | CN02524 | 7.20 ppb |
| 2022-12-12 | CN02525 | 9.40 ppb |
| 2023-03-08 | CN55281 | 8.20 ppb |
| 2023-03-08 | CN55282 | 4.60 ppb |
| 2023-03-08 | CN55283 | 6.30 ppb |
| 2023-03-08 | CN55284 | 9.90 ppb |
| 2023-05-11 | CO03465 | ND |
| 2023-05-11 | CO03466 | ND |
| 2023-06-05 | CO19179 | 19.0 ppb |
| 2023-06-05 | CO19180 | 6.00 ppb |
| 2023-06-05 | CO19181 | 5.50 ppb |
| 2023-06-05 | CO19182 | 13.0 ppb |
| 2023-09-11 | CO94210 | 13.0 ppb |
| 2023-09-11 | CO94211 | 7.30 ppb |
| 2023-09-11 | CO94212 | 7.50 ppb |
| 2023-09-11 | CO94213 | 21.0 ppb |
| 2023-12-05 | CP59865 | 6.50 ppb |
| 2023-12-05 | CP59866 | 4.80 ppb |
| 2023-12-05 | CP59867 | 5.90 ppb |
| 2023-12-05 | CP59868 | 10.00 ppb |