Dibromochloromethane
Shorewood Hills Waterworks
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
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 | 0.635 ppb | 2 | 2 | 0.560 ppb - 0.710 ppb |
| 2019 | 0.663 ppb | 4 | 4 | 0.620 ppb - 0.700 ppb |
| 2020 | 0.780 ppb | 2 | 2 | 0.700 ppb - 0.860 ppb |
| 2021 | 0.785 ppb | 2 | 2 | 0.710 ppb - 0.860 ppb |
| 2022 | 0.870 ppb | 2 | 2 | 0.820 ppb - 0.920 ppb |
| 2023 | 0.360 ppb | 2 | 2 | 0.290 ppb - 0.430 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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 |
|---|---|---|
| 2018-11-19 | 420369001 | 0.560 ppb |
| 2018-11-19 | 420372001 | 0.710 ppb |
| 2019-11-18 | 481795001 | 0.670 ppb |
| 2019-11-18 | 481819001 | 0.700 ppb |
| 2019-12-09 | 484891001 | 0.620 ppb |
| 2019-12-09 | 484892001 | 0.660 ppb |
| 2020-11-16 | 536139001 | 0.700 ppb |
| 2020-11-16 | 536137001 | 0.860 ppb |
| 2021-11-16 | 594760001 | 0.710 ppb |
| 2021-11-16 | 594754001 | 0.860 ppb |
| 2022-11-21 | 654127001 | 0.820 ppb |
| 2022-11-21 | 654126001 | 0.920 ppb |
| 2023-12-08 | 713883001 | 0.290 ppb |
| 2023-12-08 | 713887001 | 0.430 ppb |