Dibromochloromethane
St Marys Area Water Authority
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 | 0.313 ppb | 16 | 5 | ND - 1.000 ppb |
| 2019 | 0.504 ppb | 16 | 9 | ND - 1.000 ppb |
| 2020 | 0.876 ppb | 16 | 15 | ND - 1.12 ppb |
| 2021 | 0.691 ppb | 16 | 12 | ND - 1.25 ppb |
| 2022 | 0.269 ppb | 16 | 7 | ND - 0.840 ppb |
| 2023 | 0.279 ppb | 16 | 4 | ND - 1.18 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 | Lab ID | Result |
|---|---|---|
| 2018-03-15 | (704) Windfa | 1.000 ppb |
| 2018-03-15 | (701 ) Jet | 1.000 ppb |
| 2018-03-15 | (702) Fox Ta | ND |
| 2018-03-15 | (703) Ginthe | ND |
| 2018-06-12 | (701 ) Jet | 1.000 ppb |
| 2018-06-12 | (704) Windfa | ND |
| 2018-06-12 | (702) Fox Ta | ND |
| 2018-06-12 | (703) Ginthe | ND |
| 2018-09-11 | (701 ) Jet | ND |
| 2018-09-11 | (704) Windfa | 1.000 ppb |
| 2018-09-11 | (702) Fox Ta | 1.000 ppb |
| 2018-09-11 | (703) Ginthe | ND |
| 2018-12-11 | (701 ) Jet | ND |
| 2018-12-11 | (704) Windfa | ND |
| 2018-12-11 | (703) Ginthe | ND |
| 2018-12-11 | (702) Fox Ta | ND |
| 2019-03-12 | (704) Windfa | 1.000 ppb |
| 2019-03-12 | (701 ) Jet | 1.000 ppb |
| 2019-03-12 | (702) Fox Ta | ND |
| 2019-03-12 | (703) Ginthe | 1.000 ppb |
| 2019-06-11 | (704) Windfa | 1.000 ppb |
| 2019-06-11 | (701 ) Jet | ND |
| 2019-06-11 | (702) Fox Ta | ND |
| 2019-06-11 | (703) Ginthe | ND |
| 2019-09-10 | (701 ) Jet | ND |
| 2019-09-10 | (702) Fox Ta | ND |
| 2019-09-10 | (703) Ginthe | ND |
| 2019-09-10 | (704) Windfa | 1.000 ppb |
| 2019-12-10 | 9L16180-04 | 0.950 ppb |
| 2019-12-10 | 9L16180-01 | 0.800 ppb |
| 2019-12-10 | 9L16180-02 | 0.760 ppb |
| 2019-12-10 | 9L16180-03 | 0.560 ppb |
| 2020-03-10 | 0.940 ppb | |
| 2020-03-10 | 0.990 ppb | |
| 2020-03-10 | 0.540 ppb | |
| 2020-03-10 | 0.920 ppb | |
| 2020-06-09 | 1.03 ppb | |
| 2020-06-09 | 0.960 ppb | |
| 2020-06-09 | ND | |
| 2020-06-09 | 0.900 ppb | |
| 2020-09-09 | 1.08 ppb | |
| 2020-09-09 | 1.11 ppb | |
| 2020-09-09 | 0.990 ppb | |
| 2020-09-09 | 1.07 ppb | |
| 2020-12-15 | 0.830 ppb | |
| 2020-12-15 | 0.940 ppb | |
| 2020-12-15 | 0.590 ppb | |
| 2020-12-15 | 1.12 ppb | |
| 2021-03-23 | 1.25 ppb | |
| 2021-03-23 | 1.12 ppb | |
| 2021-03-23 | 0.830 ppb | |
| 2021-03-23 | 0.720 ppb | |
| 2021-06-09 | 0.920 ppb | |
| 2021-06-09 | 0.800 ppb | |
| 2021-06-09 | 0.740 ppb | |
| 2021-06-09 | 0.920 ppb | |
| 2021-09-09 | 1.19 ppb | |
| 2021-09-09 | ND | |
| 2021-09-09 | ND | |
| 2021-09-09 | 1.24 ppb | |
| 2021-12-09 | 0.530 ppb | |
| 2021-12-09 | ND | |
| 2021-12-09 | ND | |
| 2021-12-09 | 0.790 ppb | |
| 2022-03-09 | 0.560 ppb | |
| 2022-03-09 | ND | |
| 2022-03-09 | ND | |
| 2022-03-09 | ND | |
| 2022-06-09 | 0.620 ppb | |
| 2022-06-09 | 0.520 ppb | |
| 2022-06-09 | ND | |
| 2022-06-09 | 0.550 ppb | |
| 2022-09-09 | 0.660 ppb | |
| 2022-09-09 | 0.840 ppb | |
| 2022-09-09 | ND | |
| 2022-09-09 | 0.560 ppb | |
| 2022-12-09 | ND | |
| 2022-12-09 | ND | |
| 2022-12-09 | ND | |
| 2022-12-09 | ND | |
| 2023-03-09 | ND | |
| 2023-03-09 | ND | |
| 2023-03-09 | ND | |
| 2023-03-09 | ND | |
| 2023-06-09 | ND | |
| 2023-06-09 | ND | |
| 2023-06-09 | ND | |
| 2023-06-09 | ND | |
| 2023-09-12 | 1.17 ppb | |
| 2023-09-12 | 1.18 ppb | |
| 2023-09-12 | ND | |
| 2023-09-12 | 1.06 ppb | |
| 2023-12-12 | ND | |
| 2023-12-12 | 1.05 ppb | |
| 2023-12-12 | ND | |
| 2023-12-12 | ND |