Dibromochloromethane
Flora
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 | 0.491 ppb | 8 | 6 | ND - 0.807 ppb |
| 2019 | 0.695 ppb | 8 | 6 | ND - 1.21 ppb |
| 2020 | 0.706 ppb | 8 | 6 | ND - 1.24 ppb |
| 2021 | 1.02 ppb | 8 | 8 | 0.646 ppb - 1.45 ppb |
| 2022 | 0.900 ppb | 8 | 7 | ND - 1.19 ppb |
| 2023 | 1.22 ppb | 8 | 8 | 0.821 ppb - 1.81 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 | 8020977-01 | 0.654 ppb |
| 2018-02-06 | 8020977-02 | 0.638 ppb |
| 2018-05-08 | 8051830-01 | ND |
| 2018-05-08 | 8051830-02 | ND |
| 2018-08-07 | 8081518-01 | 0.807 ppb |
| 2018-08-07 | 8081518-02 | 0.763 ppb |
| 2018-11-06 | 8111189-02 | 0.543 ppb |
| 2018-11-06 | 8111189-01 | 0.525 ppb |
| 2019-02-05 | 9020916-02 | ND |
| 2019-02-05 | 9020916-01 | ND |
| 2019-05-07 | 9051776-01 | 0.704 ppb |
| 2019-05-07 | 9051776-02 | 0.694 ppb |
| 2019-08-06 | 9081442-02 | 1.14 ppb |
| 2019-08-06 | 9081442-01 | 1.21 ppb |
| 2019-11-05 | 9110877-02 | 0.934 ppb |
| 2019-11-05 | 9110877-01 | 0.881 ppb |
| 2020-02-04 | 0020887-02 | ND |
| 2020-02-04 | 0020887-01 | ND |
| 2020-05-05 | 0050918-01 | 1.16 ppb |
| 2020-05-05 | 0050918-02 | 1.24 ppb |
| 2020-08-10 | 0082258-02 | 0.845 ppb |
| 2020-08-10 | 0082258-01 | 0.886 ppb |
| 2020-11-09 | 0111966-02 | 0.718 ppb |
| 2020-11-09 | 0111966-01 | 0.798 ppb |
| 2021-02-02 | EB00729-02 | 0.971 ppb |
| 2021-02-02 | EB00729-01 | 0.966 ppb |
| 2021-05-04 | EE00743-01 | 1.45 ppb |
| 2021-05-04 | EE00743-02 | 1.34 ppb |
| 2021-08-03 | EH00990-01 | 0.996 ppb |
| 2021-08-03 | EH00990-02 | 0.973 ppb |
| 2021-11-02 | EK00743-01 | 0.815 ppb |
| 2021-11-02 | EK00743-02 | 0.646 ppb |
| 2022-02-08 | FB01595-02 | 1.08 ppb |
| 2022-02-08 | FB01595-01 | 1.04 ppb |
| 2022-05-03 | FE00785-01 | 0.939 ppb |
| 2022-05-03 | FE00785-02 | ND |
| 2022-08-09 | FH02273-01 | 0.885 ppb |
| 2022-08-09 | FH02273-02 | 0.927 ppb |
| 2022-11-01 | FK00575-01 | 1.14 ppb |
| 2022-11-01 | FK00575-02 | 1.19 ppb |
| 2023-02-01 | GB00384-01 | 0.904 ppb |
| 2023-02-01 | GB00384-02 | 0.821 ppb |
| 2023-05-02 | GE00684-01 | 0.948 ppb |
| 2023-05-02 | GE00684-02 | 0.846 ppb |
| 2023-08-02 | GH00861-01 | 1.34 ppb |
| 2023-08-02 | GH00861-02 | 1.39 ppb |
| 2023-11-01 | GK00424-01 | 1.67 ppb |
| 2023-11-01 | GK00424-02 | 1.81 ppb |