Bromodichloromethane
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Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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 | ND | 4 | 0 | ND |
| 2019 | 9.00 ppb | 4 | 4 | 7.50 ppb - 10.5 ppb |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | 3.28 ppb | 4 | 4 | 1.20 ppb - 5.70 ppb |
| 2023 | 6.18 ppb | 8 | 8 | 2.90 ppb - 11.0 ppb |
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 bromodichloromethane 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 |
|---|---|---|
| 2018-08-16 | 35411994001 | ND |
| 2018-08-16 | 35411994002 | ND |
| 2018-08-16 | 35411994001 | ND |
| 2018-08-16 | 35411994002 | ND |
| 2019-08-01 | 35486872002 | 10.5 ppb |
| 2019-08-01 | 35486872001 | 7.50 ppb |
| 2019-08-01 | 35486872002 | 10.5 ppb |
| 2019-08-01 | 35486872001 | 7.50 ppb |
| 2020-08-19 | 35572695001 | ND |
| 2020-08-19 | 35572695002 | ND |
| 2021-08-23 | 35658419001 | ND |
| 2021-08-23 | 35658419002 | ND |
| 2022-08-10 | 35739071002 | 1.20 ppb |
| 2022-08-10 | 35739071001 | 5.70 ppb |
| 2022-11-16 | 35760612001 | 4.30 ppb |
| 2022-11-16 | 35760612002 | 1.90 ppb |
| 2023-02-02 | 35776737005 | 4.00 ppb |
| 2023-02-02 | 35776737006 | 6.00 ppb |
| 2023-05-04 | 35797437001 | 4.20 ppb |
| 2023-05-04 | 35797437002 | 11.0 ppb |
| 2023-08-03 | 35818168001 | 2.90 ppb |
| 2023-08-03 | 35818168002 | 9.60 ppb |
| 2023-11-07 | 35840527001 | 3.40 ppb |
| 2023-11-07 | 35840527002 | 8.30 ppb |