Dibromochloromethane
Carlyle
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 | 0.752 ppb | 8 | 8 | 0.537 ppb - 0.916 ppb |
| 2019 | 0.827 ppb | 8 | 8 | 0.533 ppb - 1.25 ppb |
| 2020 | 0.916 ppb | 8 | 7 | ND - 1.41 ppb |
| 2021 | 1.11 ppb | 8 | 8 | 0.750 ppb - 1.54 ppb |
| 2022 | 0.921 ppb | 8 | 8 | 0.692 ppb - 1.06 ppb |
| 2023 | 1.58 ppb | 8 | 8 | 1.09 ppb - 2.54 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 |
|---|---|---|
| 2018-02-06 | 8020981-01 | 0.916 ppb |
| 2018-02-06 | 8020981-02 | 0.841 ppb |
| 2018-05-15 | 8053010-01 | 0.755 ppb |
| 2018-05-15 | 8053010-02 | 0.714 ppb |
| 2018-08-27 | 8085301-01 | 0.827 ppb |
| 2018-08-27 | 8085301-02 | 0.851 ppb |
| 2018-11-14 | 8112901-02 | 0.573 ppb |
| 2018-11-14 | 8112901-01 | 0.537 ppb |
| 2019-02-04 | 9020473-02 | 0.533 ppb |
| 2019-02-04 | 9020473-01 | 0.555 ppb |
| 2019-05-21 | 9054499-01 | 0.742 ppb |
| 2019-05-21 | 9054499-02 | 0.682 ppb |
| 2019-08-21 | 9084945-02 | 0.834 ppb |
| 2019-08-21 | 9084945-01 | 0.918 ppb |
| 2019-11-13 | 9112443-02 | 1.10 ppb |
| 2019-11-13 | 9112443-01 | 1.25 ppb |
| 2020-02-24 | 0024239-02 | 0.592 ppb |
| 2020-02-24 | 0024239-01 | ND |
| 2020-05-18 | 0053294-01 | 1.09 ppb |
| 2020-05-18 | 0053294-02 | 1.41 ppb |
| 2020-08-18 | 0084096-02 | 1.04 ppb |
| 2020-08-18 | 0084096-01 | 1.17 ppb |
| 2020-11-16 | 0113180-02 | 1.03 ppb |
| 2020-11-16 | 0113180-01 | 0.993 ppb |
| 2021-02-28 | EC00486-02 | 0.888 ppb |
| 2021-02-28 | EC00486-01 | 0.999 ppb |
| 2021-05-17 | EE03347-01 | 1.54 ppb |
| 2021-05-17 | EE03347-02 | 1.50 ppb |
| 2021-08-24 | EH05252-01 | 1.14 ppb |
| 2021-08-24 | EH05252-02 | 1.22 ppb |
| 2021-11-22 | EK04549-01 | 0.750 ppb |
| 2021-11-22 | EK04549-02 | 0.872 ppb |
| 2022-02-08 | FB01645-02 | 1.03 ppb |
| 2022-02-08 | FB01645-01 | 1.04 ppb |
| 2022-05-17 | FE03735-01 | 1.01 ppb |
| 2022-05-17 | FE03735-02 | 1.06 ppb |
| 2022-08-23 | FH05037-01 | 0.913 ppb |
| 2022-08-23 | FH05037-02 | 0.692 ppb |
| 2022-11-07 | FK01532-01 | 0.799 ppb |
| 2022-11-07 | FK01532-02 | 0.827 ppb |
| 2023-02-13 | GB02675-01 | 1.10 ppb |
| 2023-02-13 | GB02675-02 | 1.12 ppb |
| 2023-05-09 | GE02188-01 | 1.09 ppb |
| 2023-05-09 | GE02188-02 | 1.14 ppb |
| 2023-09-12 | GI02145-01 | 2.37 ppb |
| 2023-09-12 | GI02145-02 | 2.54 ppb |
| 2023-11-07 | GK01685-01 | 1.55 ppb |
| 2023-11-07 | GK01685-02 | 1.76 ppb |