Bromochloromethane
Williams Water Supply
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 | 0.700 ppb | 1 | 1 | 0.700 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 1.75 ppb | 2 | 2 | 1.50 ppb - 2.00 ppb |
| 2022 | 1.35 ppb | 4 | 4 | 0.800 ppb - 1.60 ppb |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2019-02-04 | OE767355 | 0.700 ppb |
| 2021-08-02 | OE1778892 | 1.50 ppb |
| 2021-11-01 | OE1915530 | 2.00 ppb |
| 2022-02-01 | OE2035034 | 1.50 ppb |
| 2022-06-15 | OE2118487 | 1.60 ppb |
| 2022-08-09 | OE2153453 | 1.50 ppb |
| 2022-11-01 | OE2200810 | 0.800 ppb |