Dibromochloromethane
South Deerfield Water Supply District
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 | 0.498 ppb | 5 | 4 | ND - 0.850 ppb |
| 2019 | 0.226 ppb | 5 | 1 | ND - 1.13 ppb |
| 2020 | 0.216 ppb | 5 | 1 | ND - 1.08 ppb |
| 2021 | 0.232 ppb | 5 | 1 | ND - 1.16 ppb |
| 2022 | 0.544 ppb | 5 | 4 | ND - 0.910 ppb |
| 2023 | 0.262 ppb | 5 | 2 | ND - 0.810 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 | Result |
|---|---|
| 2018-01-02 | ND |
| 2018-04-03 | 0.550 ppb |
| 2018-07-03 | 0.580 ppb |
| 2018-07-24 | 0.510 ppb |
| 2018-10-01 | 0.850 ppb |
| 2019-01-02 | ND |
| 2019-04-02 | ND |
| 2019-07-01 | ND |
| 2019-07-01 | ND |
| 2019-10-03 | 1.13 ppb |
| 2020-01-07 | ND |
| 2020-04-14 | ND |
| 2020-07-06 | ND |
| 2020-07-06 | ND |
| 2020-10-06 | 1.08 ppb |
| 2021-01-05 | ND |
| 2021-04-06 | ND |
| 2021-07-09 | ND |
| 2021-07-09 | ND |
| 2021-10-08 | 1.16 ppb |
| 2022-01-06 | 0.570 ppb |
| 2022-04-08 | ND |
| 2022-07-08 | 0.520 ppb |
| 2022-07-08 | 0.910 ppb |
| 2022-10-03 | 0.720 ppb |
| 2023-01-03 | 0.500 ppb |
| 2023-04-06 | ND |
| 2023-07-03 | ND |
| 2023-07-05 | ND |
| 2023-10-06 | 0.810 ppb |