Bromochloromethane
North Castle Water District #2
Bromochloromethane is a tap water disinfection byproduct; it is also used as an intermediate in chemical manufacturing and as a fire extinguishing agent. Disinfection byproducts in drinking water increase the risk of 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 7 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromochloromethane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer, harm to reproduction and child development, and change to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2020-02-25 | AW03859-POCS | ND |
| 2020-02-25 | AW03849-POCS | ND |
| 2020-07-21 | AW13840-POCS | ND |
| 2020-09-04 | AW17236-POCS | ND |
| 2020-09-04 | AW17232-POCS | ND |
| 2020-09-04 | AW17231-POCS | ND |
| 2020-09-04 | AW17229-POCS | ND |
| 2021-03-02 | AX04048-POCS | ND |
| 2021-03-03 | AX04220-POCS | ND |
| 2021-07-06 | AX13095-POCS | ND |
| 2022-03-01 | AY03624-POCS | ND |
| 2022-03-01 | AY03626-POCS | ND |
| 2022-07-19 | AY12488-POCS | ND |
| 2023-03-21 | AZ05021-POCS | ND |
| 2023-03-21 | AZ05013-POCS | ND |
| 2023-08-28 | AZ15886-POCS | ND |
| 2023-09-05 | AZ16356-POCS | ND |
| 2023-09-05 | AZ16357-POCS | ND |
| 2023-09-05 | AZ16353-POCS | ND |
| 2023-09-05 | AZ16354-POCS | ND |