Bromodichloromethane
Bcwsa Main Lower South
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 | 7.75 ppb | 32 | 32 | 3.50 ppb - 13.8 ppb |
| 2019 | 7.23 ppb | 32 | 32 | 3.20 ppb - 17.4 ppb |
| 2020 | 9.09 ppb | 65 | 65 | 3.20 ppb - 17.7 ppb |
| 2021 | 7.91 ppb | 96 | 96 | 3.10 ppb - 20.8 ppb |
| 2022 | 7.18 ppb | 97 | 97 | 2.70 ppb - 17.3 ppb |
| 2023 | 6.64 ppb | 96 | 96 | 2.40 ppb - 13.2 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 |
|---|---|---|
| 2018-02-16 | 8022971-01 | 3.50 ppb |
| 2018-02-16 | 8022811-02 | 3.50 ppb |
| 2018-02-16 | 8022811-03 | 3.60 ppb |
| 2018-02-16 | 8022811-04 | 5.70 ppb |
| 2018-02-16 | 8022811-05 | 5.50 ppb |
| 2018-02-16 | 8022811-06 | 7.60 ppb |
| 2018-02-16 | 8022811-07 | 6.20 ppb |
| 2018-02-16 | 8022811-08 | 7.10 ppb |
| 2018-05-17 | 8053554-01 | 5.60 ppb |
| 2018-05-17 | 8053554-02 | 6.80 ppb |
| 2018-05-17 | 8053554-03 | 5.90 ppb |
| 2018-05-17 | 8053554-04 | 6.90 ppb |
| 2018-05-17 | 8053554-05 | 5.90 ppb |
| 2018-05-17 | 8053554-06 | 9.80 ppb |
| 2018-05-17 | 8053554-07 | 7.30 ppb |
| 2018-05-17 | 8053554-08 | 9.90 ppb |
| 2018-08-13 | 8082937-01 | 8.10 ppb |
| 2018-08-13 | 8082937-02 | 10.3 ppb |
| 2018-08-13 | 8082937-03 | 9.90 ppb |
| 2018-08-13 | 8082937-04 | 9.20 ppb |
| 2018-08-13 | 8082937-05 | 13.8 ppb |
| 2018-08-13 | 8082937-06 | 13.3 ppb |
| 2018-08-13 | 8082937-07 | 12.4 ppb |
| 2018-08-13 | 8082937-08 | 12.3 ppb |
| 2018-11-12 | 8032032-01RE | 5.00 ppb |
| 2018-11-14 | 8032034-01 | 6.80 ppb |
| 2018-11-14 | 8032035-01 | 7.40 ppb |
| 2018-11-14 | 8032036-01 | 9.10 ppb |
| 2018-11-14 | 8032037-01 | 6.80 ppb |
| 2018-11-14 | 8032038-01 | 9.70 ppb |
| 2018-11-14 | 8032039-01 | 8.50 ppb |
| 2018-11-15 | 8034181-01 | 4.50 ppb |
| 2019-02-13 | 9004485-01 | 3.70 ppb |
| 2019-02-13 | 9004486-01 | 6.20 ppb |
| 2019-02-13 | 9004487-01 | 4.70 ppb |
| 2019-02-14 | 9004483-01 | 3.40 ppb |
| 2019-02-14 | 9004484-01 | 5.50 ppb |
| 2019-02-14 | 9004488-01 | 5.10 ppb |
| 2019-02-14 | 9004489-01 | 4.60 ppb |
| 2019-02-15 | 9004482-01 | 3.20 ppb |
| 2019-05-13 | 9015730-01 | 4.30 ppb |
| 2019-05-13 | 9015731-01 | 4.40 ppb |
| 2019-05-13 | 9015732-01 | 5.70 ppb |
| 2019-05-13 | 9015733-01 | 5.30 ppb |
| 2019-05-13 | 9015734-01 | 8.40 ppb |
| 2019-05-13 | 9015735-01 | 8.20 ppb |
| 2019-05-13 | 9015736-01 | 8.10 ppb |
| 2019-05-13 | 9015737-01 | 7.40 ppb |
| 2019-08-12 | 9028010-01 | 6.30 ppb |
| 2019-08-12 | 9028011-01 | 6.00 ppb |
| 2019-08-12 | 9028012-01 | 8.20 ppb |
| 2019-08-12 | 9028013-01 | 6.80 ppb |
| 2019-08-12 | 9028014-01 | 16.9 ppb |
| 2019-08-12 | 9028015-01 | 17.4 ppb |
| 2019-08-12 | 9028016-01 | 9.80 ppb |
| 2019-08-12 | 9028017-01 | 9.70 ppb |
| 2019-11-11 | 9112242-01 | 4.80 ppb |
| 2019-11-11 | 9112242-02 | 5.00 ppb |
| 2019-11-11 | 9112242-03 | 9.00 ppb |
| 2019-11-11 | 9112242-04 | 8.00 ppb |
| 2019-11-11 | 9112242-05 | 11.1 ppb |
| 2019-11-11 | 9112242-06 | 8.80 ppb |
| 2019-11-11 | 9112242-07 | 10.2 ppb |
| 2019-11-11 | 9112242-08 | 5.30 ppb |
| 2020-02-12 | 3.20 ppb | |
| 2020-02-12 | 3.20 ppb | |
| 2020-02-12 | 6.10 ppb | |
| 2020-02-12 | 4.50 ppb | |
| 2020-02-12 | 8.60 ppb | |
| 2020-02-12 | 7.80 ppb | |
| 2020-02-12 | 6.60 ppb | |
| 2020-02-12 | 6.10 ppb | |
| 2020-05-13 | 4.40 ppb | |
| 2020-05-13 | 4.10 ppb | |
| 2020-05-13 | 8.40 ppb | |
| 2020-05-13 | 6.30 ppb | |
| 2020-05-13 | 7.90 ppb | |
| 2020-05-13 | 7.90 ppb | |
| 2020-05-13 | 8.40 ppb | |
| 2020-05-13 | 8.20 ppb | |
| 2020-08-14 | 6.70 ppb | |
| 2020-08-14 | 5.70 ppb | |
| 2020-08-14 | 10.5 ppb | |
| 2020-08-14 | 6.30 ppb | |
| 2020-08-14 | 13.9 ppb | |
| 2020-08-14 | 13.7 ppb | |
| 2020-08-14 | 12.6 ppb | |
| 2020-08-14 | 14.4 ppb | |
| 2020-09-04 | 17.7 ppb | |
| 2020-09-08 | 15.3 ppb | |
| 2020-09-11 | 16.2 ppb | |
| 2020-09-15 | 14.3 ppb | |
| 2020-09-15 | 9.80 ppb | |
| 2020-09-18 | 6.10 ppb | |
| 2020-09-18 | 6.50 ppb | |
| 2020-09-18 | 8.20 ppb | |
| 2020-09-18 | 7.80 ppb | |
| 2020-09-18 | 14.9 ppb | |
| 2020-09-18 | 16.1 ppb | |
| 2020-09-18 | 9.30 ppb | |
| 2020-09-18 | 15.9 ppb | |
| 2020-09-22 | 13.6 ppb | |
| 2020-09-22 | 14.1 ppb | |
| 2020-09-29 | 12.9 ppb | |
| 2020-09-29 | 11.8 ppb | |
| 2020-10-14 | 5.30 ppb | |
| 2020-10-14 | 5.10 ppb | |
| 2020-10-14 | 5.60 ppb | |
| 2020-10-14 | 6.20 ppb | |
| 2020-10-14 | 15.8 ppb | |
| 2020-10-14 | 15.2 ppb | |
| 2020-10-14 | 13.6 ppb | |
| 2020-10-14 | 10.9 ppb | |
| 2020-11-13 | 5.80 ppb | |
| 2020-11-13 | 6.10 ppb | |
| 2020-11-13 | 6.20 ppb | |
| 2020-11-13 | 6.80 ppb | |
| 2020-11-13 | 12.5 ppb | |
| 2020-11-13 | 12.1 ppb | |
| 2020-11-13 | 8.40 ppb | |
| 2020-11-13 | 12.6 ppb | |
| 2020-12-11 | 3.80 ppb | |
| 2020-12-11 | 3.50 ppb | |
| 2020-12-11 | 7.00 ppb | |
| 2020-12-11 | 4.50 ppb | |
| 2020-12-11 | 8.60 ppb | |
| 2020-12-11 | 7.10 ppb | |
| 2020-12-11 | 6.80 ppb | |
| 2020-12-11 | 5.60 ppb | |
| 2021-01-15 | 3.10 ppb | |
| 2021-01-15 | 3.40 ppb | |
| 2021-01-15 | 6.40 ppb | |
| 2021-01-15 | 3.80 ppb | |
| 2021-01-15 | 8.20 ppb | |
| 2021-01-15 | 6.70 ppb | |
| 2021-01-15 | 7.20 ppb | |
| 2021-01-15 | 7.70 ppb | |
| 2021-02-12 | 3.10 ppb | |
| 2021-02-12 | 3.20 ppb | |
| 2021-02-12 | 4.30 ppb | |
| 2021-02-12 | 3.50 ppb | |
| 2021-02-12 | 7.60 ppb | |
| 2021-02-12 | 7.70 ppb | |
| 2021-02-12 | 5.10 ppb | |
| 2021-02-12 | 8.00 ppb | |
| 2021-03-11 | 3.10 ppb | |
| 2021-03-11 | 3.10 ppb | |
| 2021-03-11 | 4.20 ppb | |
| 2021-03-11 | 3.10 ppb | |
| 2021-03-11 | 5.60 ppb | |
| 2021-03-11 | 9.00 ppb | |
| 2021-03-11 | 5.70 ppb | |
| 2021-03-11 | 8.30 ppb | |
| 2021-04-12 | 5.20 ppb | |
| 2021-04-12 | 4.30 ppb | |
| 2021-04-12 | 4.50 ppb | |
| 2021-04-12 | 8.90 ppb | |
| 2021-04-12 | 8.30 ppb | |
| 2021-04-12 | 6.20 ppb | |
| 2021-04-12 | 9.40 ppb | |
| 2021-04-16 | 3.20 ppb | |
| 2021-05-12 | 4.70 ppb | |
| 2021-05-12 | 4.80 ppb | |
| 2021-05-12 | 6.10 ppb | |
| 2021-05-12 | 5.40 ppb | |
| 2021-05-12 | 8.70 ppb | |
| 2021-05-12 | 8.60 ppb | |
| 2021-05-12 | 6.40 ppb | |
| 2021-05-12 | 7.10 ppb | |
| 2021-06-11 | 4.50 ppb | |
| 2021-06-11 | 4.70 ppb | |
| 2021-06-11 | 7.60 ppb | |
| 2021-06-11 | 5.60 ppb | |
| 2021-06-11 | 13.6 ppb | |
| 2021-06-11 | 14.6 ppb | |
| 2021-06-11 | 6.40 ppb | |
| 2021-06-11 | 13.5 ppb | |
| 2021-07-28 | 8.10 ppb | |
| 2021-07-28 | 8.00 ppb | |
| 2021-07-28 | 8.70 ppb | |
| 2021-07-28 | 9.10 ppb | |
| 2021-07-28 | 16.1 ppb | |
| 2021-07-28 | 17.3 ppb | |
| 2021-07-28 | 11.9 ppb | |
| 2021-07-28 | 17.1 ppb | |
| 2021-08-13 | 7.20 ppb | |
| 2021-08-13 | 7.00 ppb | |
| 2021-08-13 | 10.4 ppb | |
| 2021-08-13 | 7.70 ppb | |
| 2021-08-13 | 17.2 ppb | |
| 2021-08-13 | 18.2 ppb | |
| 2021-08-13 | 10.7 ppb | |
| 2021-08-13 | 20.8 ppb | |
| 2021-09-10 | 6.10 ppb | |
| 2021-09-10 | 7.30 ppb | |
| 2021-09-10 | 8.30 ppb | |
| 2021-09-10 | 6.90 ppb | |
| 2021-09-10 | 8.60 ppb | |
| 2021-09-10 | 11.0 ppb | |
| 2021-09-10 | 8.20 ppb | |
| 2021-09-10 | 8.80 ppb | |
| 2021-10-15 | 5.80 ppb | |
| 2021-10-15 | 7.80 ppb | |
| 2021-10-15 | 7.10 ppb | |
| 2021-10-15 | 8.40 ppb | |
| 2021-10-15 | 8.70 ppb | |
| 2021-10-15 | 11.0 ppb | |
| 2021-10-15 | 10.4 ppb | |
| 2021-10-15 | 11.7 ppb | |
| 2021-11-12 | 5.30 ppb | |
| 2021-11-12 | 5.40 ppb | |
| 2021-11-12 | 11.5 ppb | |
| 2021-11-12 | 6.10 ppb | |
| 2021-11-12 | 9.00 ppb | |
| 2021-11-12 | 11.5 ppb | |
| 2021-11-12 | 10.00 ppb | |
| 2021-11-12 | 11.8 ppb | |
| 2021-12-10 | 3.30 ppb | |
| 2021-12-10 | 3.40 ppb | |
| 2021-12-10 | 9.90 ppb | |
| 2021-12-10 | 4.30 ppb | |
| 2021-12-10 | 6.60 ppb | |
| 2021-12-10 | 9.00 ppb | |
| 2021-12-10 | 8.20 ppb | |
| 2021-12-10 | 8.80 ppb | |
| 2022-01-14 | 3.00 ppb | |
| 2022-01-14 | 3.10 ppb | |
| 2022-01-14 | 3.00 ppb | |
| 2022-01-14 | 3.80 ppb | |
| 2022-01-14 | 6.80 ppb | |
| 2022-01-14 | 7.60 ppb | |
| 2022-01-14 | 7.00 ppb | |
| 2022-01-14 | 4.70 ppb | |
| 2022-02-11 | 2.70 ppb | |
| 2022-02-11 | 2.70 ppb | |
| 2022-02-11 | 4.80 ppb | |
| 2022-02-11 | 3.70 ppb | |
| 2022-02-11 | 5.90 ppb | |
| 2022-02-11 | 5.60 ppb | |
| 2022-02-11 | 4.60 ppb | |
| 2022-02-11 | 5.80 ppb | |
| 2022-03-11 | 3.20 ppb | |
| 2022-03-11 | 3.40 ppb | |
| 2022-03-11 | 6.50 ppb | |
| 2022-03-11 | 3.80 ppb | |
| 2022-03-11 | 7.20 ppb | |
| 2022-03-11 | 6.70 ppb | |
| 2022-03-11 | 4.70 ppb | |
| 2022-03-11 | 6.70 ppb | |
| 2022-04-15 | 3.90 ppb | |
| 2022-04-15 | 3.50 ppb | |
| 2022-04-15 | 6.80 ppb | |
| 2022-04-15 | 4.60 ppb | |
| 2022-04-15 | 5.20 ppb | |
| 2022-04-15 | 5.30 ppb | |
| 2022-04-15 | 5.20 ppb | |
| 2022-04-15 | 5.80 ppb | |
| 2022-05-13 | 3.80 ppb | |
| 2022-05-13 | 3.90 ppb | |
| 2022-05-13 | 6.20 ppb | |
| 2022-05-13 | 4.60 ppb | |
| 2022-05-13 | 5.40 ppb | |
| 2022-05-13 | 7.00 ppb | |
| 2022-05-13 | 5.70 ppb | |
| 2022-05-13 | 8.00 ppb | |
| 2022-06-10 | 5.60 ppb | |
| 2022-06-10 | 7.00 ppb | |
| 2022-06-10 | 6.80 ppb | |
| 2022-06-10 | 6.30 ppb | |
| 2022-06-10 | 7.70 ppb | |
| 2022-06-10 | 11.3 ppb | |
| 2022-06-10 | 10.00 ppb | |
| 2022-06-10 | 11.5 ppb | |
| 2022-07-15 | 6.40 ppb | |
| 2022-07-15 | 7.10 ppb | |
| 2022-07-15 | 6.60 ppb | |
| 2022-07-15 | 6.60 ppb | |
| 2022-07-15 | 9.60 ppb | |
| 2022-07-15 | 14.0 ppb | |
| 2022-07-15 | 7.90 ppb | |
| 2022-07-15 | 15.0 ppb | |
| 2022-08-12 | 7.20 ppb | |
| 2022-08-12 | 11.1 ppb | |
| 2022-08-12 | 8.60 ppb | |
| 2022-08-12 | 9.30 ppb | |
| 2022-08-12 | 16.0 ppb | |
| 2022-08-12 | 17.3 ppb | |
| 2022-08-12 | 17.0 ppb | |
| 2022-08-12 | 13.0 ppb | |
| 2022-09-16 | 6.60 ppb | |
| 2022-09-16 | 7.50 ppb | |
| 2022-09-16 | 7.30 ppb | |
| 2022-09-16 | 7.80 ppb | |
| 2022-09-16 | 12.6 ppb | |
| 2022-09-16 | 13.3 ppb | |
| 2022-09-16 | 11.7 ppb | |
| 2022-09-16 | 10.00 ppb | |
| 2022-10-14 | 6.20 ppb | |
| 2022-10-14 | 4.00 ppb | |
| 2022-10-14 | 6.40 ppb | |
| 2022-10-14 | 6.80 ppb | |
| 2022-10-14 | 8.40 ppb | |
| 2022-10-14 | 8.40 ppb | |
| 2022-10-14 | 7.60 ppb | |
| 2022-10-31 | 15.1 ppb | |
| 2022-10-31 | 15.1 ppb | |
| 2022-11-11 | 4.80 ppb | |
| 2022-11-11 | 4.40 ppb | |
| 2022-11-11 | 8.30 ppb | |
| 2022-11-11 | 5.30 ppb | |
| 2022-11-11 | 7.90 ppb | |
| 2022-11-11 | 11.7 ppb | |
| 2022-11-11 | 8.10 ppb | |
| 2022-11-11 | 11.8 ppb | |
| 2022-12-16 | 3.30 ppb | |
| 2022-12-16 | 4.90 ppb | |
| 2022-12-16 | 5.60 ppb | |
| 2022-12-16 | 3.20 ppb | |
| 2022-12-16 | 4.40 ppb | |
| 2022-12-16 | 5.70 ppb | |
| 2022-12-16 | 5.70 ppb | |
| 2022-12-16 | 5.50 ppb | |
| 2023-01-13 | 2.90 ppb | |
| 2023-01-13 | 3.50 ppb | |
| 2023-01-13 | 6.00 ppb | |
| 2023-01-13 | 5.10 ppb | |
| 2023-01-13 | 4.90 ppb | |
| 2023-01-13 | 5.70 ppb | |
| 2023-01-13 | 5.20 ppb | |
| 2023-01-13 | 6.00 ppb | |
| 2023-02-10 | 2.40 ppb | |
| 2023-02-10 | 2.40 ppb | |
| 2023-02-10 | 3.90 ppb | |
| 2023-02-10 | 3.90 ppb | |
| 2023-02-10 | 5.30 ppb | |
| 2023-02-10 | 7.20 ppb | |
| 2023-02-10 | 5.40 ppb | |
| 2023-02-10 | 4.30 ppb | |
| 2023-03-10 | 3.00 ppb | |
| 2023-03-10 | 4.50 ppb | |
| 2023-03-10 | 3.30 ppb | |
| 2023-03-10 | 4.10 ppb | |
| 2023-03-10 | 5.10 ppb | |
| 2023-03-10 | 5.90 ppb | |
| 2023-03-10 | 5.90 ppb | |
| 2023-03-10 | 7.70 ppb | |
| 2023-04-14 | 5.20 ppb | |
| 2023-04-14 | 6.00 ppb | |
| 2023-04-14 | 5.90 ppb | |
| 2023-04-14 | 5.70 ppb | |
| 2023-04-14 | 5.70 ppb | |
| 2023-04-14 | 6.30 ppb | |
| 2023-04-14 | 7.10 ppb | |
| 2023-04-14 | 7.10 ppb | |
| 2023-05-12 | 3.80 ppb | |
| 2023-05-12 | 3.70 ppb | |
| 2023-05-12 | 5.00 ppb | |
| 2023-05-12 | 5.40 ppb | |
| 2023-05-12 | 5.30 ppb | |
| 2023-05-12 | 5.20 ppb | |
| 2023-05-16 | 4.20 ppb | |
| 2023-05-16 | 5.10 ppb | |
| 2023-06-16 | 5.30 ppb | |
| 2023-06-16 | 7.80 ppb | |
| 2023-06-16 | 6.00 ppb | |
| 2023-06-16 | 6.50 ppb | |
| 2023-06-16 | 7.50 ppb | |
| 2023-06-16 | 13.2 ppb | |
| 2023-06-16 | 8.30 ppb | |
| 2023-06-16 | 9.50 ppb | |
| 2023-07-14 | 6.70 ppb | |
| 2023-07-14 | 7.90 ppb | |
| 2023-07-14 | 8.30 ppb | |
| 2023-07-14 | 7.80 ppb | |
| 2023-07-14 | 9.70 ppb | |
| 2023-07-14 | 11.1 ppb | |
| 2023-07-14 | 11.5 ppb | |
| 2023-07-14 | 12.6 ppb | |
| 2023-08-16 | 5.90 ppb | |
| 2023-08-16 | 5.70 ppb | |
| 2023-08-16 | 7.30 ppb | |
| 2023-08-16 | 6.20 ppb | |
| 2023-08-16 | 9.50 ppb | |
| 2023-08-16 | 10.00 ppb | |
| 2023-08-16 | 9.20 ppb | |
| 2023-08-16 | 10.1 ppb | |
| 2023-09-15 | 5.70 ppb | |
| 2023-09-15 | 8.00 ppb | |
| 2023-09-15 | 6.00 ppb | |
| 2023-09-15 | 8.60 ppb | |
| 2023-09-15 | 10.00 ppb | |
| 2023-09-15 | 11.8 ppb | |
| 2023-09-15 | 8.90 ppb | |
| 2023-09-15 | 13.1 ppb | |
| 2023-10-16 | 5.30 ppb | |
| 2023-10-16 | 7.40 ppb | |
| 2023-10-16 | 8.80 ppb | |
| 2023-10-16 | 6.40 ppb | |
| 2023-10-16 | 8.30 ppb | |
| 2023-10-16 | 9.50 ppb | |
| 2023-10-16 | 9.10 ppb | |
| 2023-10-16 | 10.1 ppb | |
| 2023-11-13 | 3.60 ppb | |
| 2023-11-13 | 6.00 ppb | |
| 2023-11-13 | 7.20 ppb | |
| 2023-11-13 | 4.70 ppb | |
| 2023-11-13 | 7.40 ppb | |
| 2023-11-13 | 8.90 ppb | |
| 2023-11-13 | 6.60 ppb | |
| 2023-11-13 | 8.80 ppb | |
| 2023-12-12 | 2.80 ppb | |
| 2023-12-12 | 4.60 ppb | |
| 2023-12-12 | 5.60 ppb | |
| 2023-12-12 | 3.60 ppb | |
| 2023-12-12 | 7.10 ppb | |
| 2023-12-12 | 7.20 ppb | |
| 2023-12-12 | 5.50 ppb | |
| 2023-12-12 | 6.90 ppb |