Dibromochloromethane
Watertown Water & Sewer 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 | 0.750 ppb | 16 | 16 | 0.500 ppb - 1.30 ppb |
| 2019 | 0.656 ppb | 16 | 14 | ND - 1.10 ppb |
| 2020 | 0.644 ppb | 16 | 15 | ND - 0.900 ppb |
| 2021 | 0.638 ppb | 16 | 15 | ND - 0.800 ppb |
| 2022 | 0.588 ppb | 16 | 12 | ND - 0.900 ppb |
| 2023 | 0.419 ppb | 16 | 11 | ND - 0.800 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 |
|---|---|---|
| 2018-03-07 | DBP 200489534 | 0.600 ppb |
| 2018-03-07 | DBP 200489535 | 0.600 ppb |
| 2018-03-07 | DBP 200489536 | 0.600 ppb |
| 2018-03-07 | DBP 200489533 | 0.600 ppb |
| 2018-06-06 | DBP 200496328 | 0.800 ppb |
| 2018-06-06 | DBP 200496329 | 0.700 ppb |
| 2018-06-06 | DBP 200496330 | 0.700 ppb |
| 2018-06-06 | DBP 200496331 | 0.700 ppb |
| 2018-09-05 | DBP 200504061 | 1.30 ppb |
| 2018-09-05 | DBP 200504062 | 1.10 ppb |
| 2018-09-05 | DBP 200504063 | 0.900 ppb |
| 2018-09-05 | DBP 200504064 | 1.000 ppb |
| 2018-12-05 | DBP 200514980 | 0.700 ppb |
| 2018-12-05 | DBP 200514982 | 0.600 ppb |
| 2018-12-05 | DBP 200514981 | 0.600 ppb |
| 2018-12-05 | DBP 200514978 | 0.500 ppb |
| 2019-03-06 | DBP 200523708 | 0.700 ppb |
| 2019-03-06 | DBP 200523709 | 0.600 ppb |
| 2019-03-06 | DBP 200523710 | 0.600 ppb |
| 2019-03-06 | DBP 200523711 | 0.500 ppb |
| 2019-06-05 | DBP 200535068 | 0.600 ppb |
| 2019-06-05 | DBP 200535069 | ND |
| 2019-06-05 | DBP 200535070 | ND |
| 2019-06-05 | DBP 200535071 | 0.500 ppb |
| 2019-09-05 | DBP 200547637 | 1.000 ppb |
| 2019-09-05 | DBP 200547640 | 1.000 ppb |
| 2019-09-05 | DBP 200547639 | 1.000 ppb |
| 2019-09-05 | DBP 200547636 | 1.10 ppb |
| 2019-12-05 | DBP 200559147 | 0.600 ppb |
| 2019-12-05 | DBP 200559148 | 0.700 ppb |
| 2019-12-05 | DBP 200559149 | 0.700 ppb |
| 2019-12-05 | DBP 200559146 | 0.900 ppb |
| 2020-03-04 | DBP 200568197 | 0.500 ppb |
| 2020-03-04 | DBP 200568198 | ND |
| 2020-03-04 | DBP 200568199 | 0.600 ppb |
| 2020-03-04 | DBP 200568200 | 0.600 ppb |
| 2020-06-03 | DBP 200577855 | 0.600 ppb |
| 2020-06-03 | DBP 200577856 | 0.600 ppb |
| 2020-06-03 | DBP 200577854 | 0.600 ppb |
| 2020-06-03 | DBP 200577853 | 0.700 ppb |
| 2020-09-02 | DBP 200588679 | 0.900 ppb |
| 2020-09-02 | DBP 200588680 | 0.700 ppb |
| 2020-09-02 | DBP 200588681 | 0.800 ppb |
| 2020-09-02 | DBP 200588682 | 0.800 ppb |
| 2020-12-02 | DBP 200599791 | 0.700 ppb |
| 2020-12-02 | DBP 200599792 | 0.800 ppb |
| 2020-12-02 | DBP 200599793 | 0.700 ppb |
| 2020-12-02 | DBP 200599794 | 0.700 ppb |
| 2021-03-10 | DBP 200609349 | 0.500 ppb |
| 2021-03-10 | DBP 200609346 | 0.600 ppb |
| 2021-03-10 | DBP 200609347 | ND |
| 2021-03-10 | DBP 200609348 | 0.600 ppb |
| 2021-06-02 | DBP 200619137 | 0.700 ppb |
| 2021-06-02 | DBP 200619139 | 0.700 ppb |
| 2021-06-02 | DBP 200619140 | 0.700 ppb |
| 2021-06-02 | DBP 200619136 | 0.800 ppb |
| 2021-09-08 | 300053894 300053896 | 0.600 ppb |
| 2021-09-08 | 300053900 300053902 | 0.700 ppb |
| 2021-09-08 | 300053903 300053905 | 0.600 ppb |
| 2021-09-22 | 300065698 300065700 | 0.700 ppb |
| 2021-12-01 | D300110687 300110689 | 0.700 ppb |
| 2021-12-01 | D300110684 300110686 | 0.800 ppb |
| 2021-12-01 | D300110681 300110683 | 0.700 ppb |
| 2021-12-01 | D300110678 300110680 | 0.800 ppb |
| 2022-03-02 | D300151783 300151785 | 0.800 ppb |
| 2022-03-02 | D300151786 300151788 | 0.700 ppb |
| 2022-03-02 | D300151789 300151791 | 0.700 ppb |
| 2022-03-02 | D300151792 300151794 | 0.700 ppb |
| 2022-06-01 | D300192098 300192100 | 0.900 ppb |
| 2022-06-01 | D300192101 300192103 | 0.800 ppb |
| 2022-06-01 | D300192104 300192106 | 0.800 ppb |
| 2022-06-01 | D300192107 300192109 | 0.800 ppb |
| 2022-09-14 | D300244033 300244035 | 0.900 ppb |
| 2022-09-14 | D300244027 300244029 | 0.500 ppb |
| 2022-09-14 | D300244024 300244026 | 0.900 ppb |
| 2022-09-14 | D300244030 300244032 | 0.900 ppb |
| 2022-12-07 | D300282718 300282720 | ND |
| 2022-12-07 | D300282721 300282723 | ND |
| 2022-12-07 | D300282724 300282726 | ND |
| 2022-12-07 | D300282727 300282729 | ND |
| 2023-03-16 | D300321892 300321894 | 0.500 ppb |
| 2023-03-16 | D300321895 300321897 | ND |
| 2023-03-16 | D300321898 300321900 | 0.500 ppb |
| 2023-03-16 | D300321901 300321903 | ND |
| 2023-06-14 | D300365450 300365452 | ND |
| 2023-06-14 | D300365456 300365458 | ND |
| 2023-06-14 | D300365453 300365455 | 0.600 ppb |
| 2023-06-14 | D300365447 300365449 | 0.500 ppb |
| 2023-09-06 | D300410877 300410879 | 0.800 ppb |
| 2023-09-06 | D300410880 300410882 | 0.700 ppb |
| 2023-09-06 | D300410883 300410885 | 0.700 ppb |
| 2023-09-06 | D300410886 300410888 | 0.800 ppb |
| 2023-12-07 | D300456855 300456857 | 0.500 ppb |
| 2023-12-07 | D300456858 300456860 | ND |
| 2023-12-07 | D300456861 300456863 | 0.600 ppb |
| 2023-12-07 | D300456864 300456866 | 0.500 ppb |