Dibromochloromethane
Monroe County Public Water Supply District 2
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 | 1.44 ppb | 8 | 6 | ND - 3.60 ppb |
| 2019 | 0.891 ppb | 8 | 7 | ND - 1.51 ppb |
| 2020 | 1.38 ppb | 8 | 8 | 0.810 ppb - 1.76 ppb |
| 2021 | 0.984 ppb | 8 | 8 | 0.780 ppb - 1.48 ppb |
| 2022 | 1.23 ppb | 8 | 8 | 0.940 ppb - 1.64 ppb |
| 2023 | 1.92 ppb | 8 | 8 | 1.10 ppb - 3.12 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 |
|---|---|---|
| 2018-03-21 | AD17684 | 0.810 ppb |
| 2018-03-21 | AD17683 | 0.710 ppb |
| 2018-05-16 | AD20473 | 1.58 ppb |
| 2018-05-16 | AD20474 | 1.91 ppb |
| 2018-08-13 | AD31148 | 2.91 ppb |
| 2018-08-13 | AD31149 | 3.60 ppb |
| 2018-11-13 | AD35683 | ND |
| 2018-11-13 | AD35684 | ND |
| 2019-02-21 | AD39351 | ND |
| 2019-02-21 | AD39352 | 0.520 ppb |
| 2019-05-15 | AD47432 | 0.810 ppb |
| 2019-05-20 | AD48617 | 0.860 ppb |
| 2019-08-19 | AD53873 | 1.51 ppb |
| 2019-08-19 | AD53874 | 1.42 ppb |
| 2019-11-14 | AD58058 | 1.10 ppb |
| 2019-11-14 | AD58059 | 0.910 ppb |
| 2020-02-12 | 2002004 | 0.810 ppb |
| 2020-02-12 | 2002005 | 0.990 ppb |
| 2020-05-20 | 2008868 | 1.40 ppb |
| 2020-05-20 | 2008869 | 1.23 ppb |
| 2020-08-18 | 2014257 | 1.74 ppb |
| 2020-08-18 | 2014258 | 1.76 ppb |
| 2020-11-23 | 2017999 | 1.50 ppb |
| 2020-11-23 | 2017998 | 1.60 ppb |
| 2021-02-10 | 2100642 | 1.48 ppb |
| 2021-02-10 | 2100643 | 0.800 ppb |
| 2021-05-17 | 2110913 | 0.790 ppb |
| 2021-05-17 | 2110914 | 0.780 ppb |
| 2021-08-12 | 2115259 | 0.930 ppb |
| 2021-08-12 | 2115258 | 0.840 ppb |
| 2021-11-15 | 2119486 | 1.31 ppb |
| 2021-11-16 | 2119487 | 0.940 ppb |
| 2022-02-15 | 2201937 | 1.04 ppb |
| 2022-02-16 | 2201936 | 1.06 ppb |
| 2022-05-17 | 2211530 | 0.950 ppb |
| 2022-05-24 | 2211531 | 0.940 ppb |
| 2022-08-11 | 2216219 | 1.46 ppb |
| 2022-08-12 | 2216218 | 1.31 ppb |
| 2022-11-16 | 2221139 | 1.47 ppb |
| 2022-11-16 | 2221138 | 1.64 ppb |
| 2023-02-21 | 2300557 | 1.18 ppb |
| 2023-02-21 | 2300558 | 1.10 ppb |
| 2023-05-17 | 2308105 | 1.88 ppb |
| 2023-05-17 | 2308104 | 1.53 ppb |
| 2023-08-14 | 2313287 | 3.12 ppb |
| 2023-08-14 | 2313288 | 3.07 ppb |
| 2023-11-20 | 2318246 | 1.67 ppb |
| 2023-11-20 | 2318245 | 1.81 ppb |