Dibromochloromethane
Sammamish Plateau Water and Sewer
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 | 0.399 ppb | 34 | 15 | ND - 1.27 ppb |
| 2019 | 0.578 ppb | 34 | 19 | ND - 1.57 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.563 ppb | 32 | 17 | ND - 1.98 ppb |
| 2022 | 0.591 ppb | 34 | 17 | ND - 2.11 ppb |
| 2023 | 0.579 ppb | 32 | 20 | ND - 3.21 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 |
|---|---|---|
| 2018-02-20 | ND | |
| 2018-02-20 | ND | |
| 2018-02-20 | 0.530 ppb | |
| 2018-02-20 | 0.660 ppb | |
| 2018-02-20 | 0.880 ppb | |
| 2018-02-20 | ND | |
| 2018-02-20 | ND | |
| 2018-02-20 | ND | |
| 2018-05-15 | 1.26 ppb | |
| 2018-05-15 | 0.840 ppb | |
| 2018-05-15 | 1.24 ppb | |
| 2018-05-15 | 0.500 ppb | |
| 2018-05-15 | 1.27 ppb | |
| 2018-05-15 | ND | |
| 2018-05-15 | ND | |
| 2018-05-15 | 0.550 ppb | |
| 2018-08-14 | 1.27 ppb | |
| 2018-08-14 | 0.520 ppb | |
| 2018-08-14 | ND | |
| 2018-08-14 | ND | |
| 2018-08-14 | 1.11 ppb | |
| 2018-08-14 | ND | |
| 2018-08-14 | ND | |
| 2018-08-14 | ND | |
| 2018-08-22 | ND | |
| 2018-08-22 | ND | |
| 2018-11-12 | ND | |
| 2018-11-12 | ND | |
| 2018-11-12 | 0.960 ppb | |
| 2018-11-12 | ND | |
| 2018-11-13 | ND | |
| 2018-11-13 | 1.07 ppb | |
| 2018-11-13 | ND | |
| 2018-11-13 | 0.910 ppb | |
| 2019-02-19 | 1.03 ppb | |
| 2019-02-19 | 0.920 ppb | |
| 2019-02-19 | 0.580 ppb | |
| 2019-02-19 | 0.640 ppb | |
| 2019-02-19 | 1.36 ppb | |
| 2019-02-19 | ND | |
| 2019-02-19 | ND | |
| 2019-02-19 | 0.580 ppb | |
| 2019-05-21 | 1.45 ppb | |
| 2019-05-21 | 1.13 ppb | |
| 2019-05-21 | ND | |
| 2019-05-21 | 0.530 ppb | |
| 2019-05-21 | 1.30 ppb | |
| 2019-05-21 | ND | |
| 2019-05-21 | 0.992 ppb | |
| 2019-05-22 | ND | |
| 2019-08-12 | ND | |
| 2019-08-12 | ND | |
| 2019-08-12 | 1.49 ppb | |
| 2019-08-12 | ND | |
| 2019-08-13 | 1.29 ppb | |
| 2019-08-13 | 0.932 ppb | |
| 2019-08-13 | ND | |
| 2019-08-13 | 0.648 ppb | |
| 2019-09-18 | ND | |
| 2019-10-30 | ND | |
| 2019-11-12 | 1.57 ppb | |
| 2019-11-12 | 0.985 ppb | |
| 2019-11-12 | ND | |
| 2019-11-12 | ND | |
| 2019-11-12 | 1.29 ppb | |
| 2019-11-12 | ND | |
| 2019-11-12 | ND | |
| 2019-11-12 | 0.929 ppb | |
| 2021-02-16 | 4078648 | 1.26 ppb |
| 2021-02-16 | 4078643 | 0.605 ppb |
| 2021-02-16 | 4078646 | ND |
| 2021-02-16 | 4078642 | ND |
| 2021-02-16 | 4078647 | ND |
| 2021-02-16 | 4078645 | 0.518 ppb |
| 2021-02-16 | 4078644 | 0.521 ppb |
| 2021-02-16 | 4078649 | 0.529 ppb |
| 2021-05-18 | 4121059 | ND |
| 2021-05-18 | 4121057 | 0.659 ppb |
| 2021-05-18 | 4121055 | 0.699 ppb |
| 2021-05-18 | 4121061 | 0.525 ppb |
| 2021-05-18 | 4121058 | ND |
| 2021-05-18 | 4121060 | 1.52 ppb |
| 2021-05-18 | 4121056 | 1.92 ppb |
| 2021-05-18 | 4121054 | ND |
| 2021-08-10 | 4172436 | ND |
| 2021-08-10 | 4172433 | ND |
| 2021-08-10 | 4172438 | ND |
| 2021-08-10 | 4172435 | 1.23 ppb |
| 2021-08-10 | 4172437 | ND |
| 2021-08-10 | 4172434 | 0.784 ppb |
| 2021-08-10 | 4172439 | 1.98 ppb |
| 2021-08-10 | 4172440 | ND |
| 2021-11-16 | 4206253 | 0.912 ppb |
| 2021-11-16 | 4206257 | 1.79 ppb |
| 2021-11-16 | 4206252 | ND |
| 2021-11-16 | 4206259 | 0.926 ppb |
| 2021-11-16 | 4206255 | ND |
| 2021-11-16 | 4206258 | 1.65 ppb |
| 2021-11-16 | 4206254 | ND |
| 2021-11-16 | 4206256 | ND |
| 2022-02-15 | 4244686 | ND |
| 2022-02-15 | 4244682 | ND |
| 2022-02-15 | 4244688 | 0.610 ppb |
| 2022-02-15 | 4244687 | 1.68 ppb |
| 2022-02-15 | 4244684 | 0.964 ppb |
| 2022-02-15 | 4244681 | ND |
| 2022-02-15 | 4244683 | ND |
| 2022-02-15 | 4244685 | ND |
| 2022-05-17 | 4284880 | 0.641 ppb |
| 2022-05-17 | 4284885 | 0.745 ppb |
| 2022-05-17 | 4284878 | ND |
| 2022-05-17 | 4284882 | ND |
| 2022-05-17 | 4284879 | 0.891 ppb |
| 2022-05-17 | 4284881 | 0.906 ppb |
| 2022-05-17 | 4284883 | 0.842 ppb |
| 2022-05-17 | 4284884 | 2.11 ppb |
| 2022-08-09 | 4330664 | ND |
| 2022-08-09 | 4330666 | 1.60 ppb |
| 2022-08-09 | 4330662 | 0.886 ppb |
| 2022-08-09 | 4330660 | ND |
| 2022-08-09 | 4330663 | ND |
| 2022-08-09 | 4330667 | ND |
| 2022-08-09 | 4330661 | 0.894 ppb |
| 2022-08-09 | 4330665 | ND |
| 2022-08-17 | 4365563 | ND |
| 2022-08-17 | 4365564 | ND |
| 2022-11-15 | 4374406 | 1.22 ppb |
| 2022-11-15 | 4374405 | 1.76 ppb |
| 2022-11-15 | 4374407 | 1.35 ppb |
| 2022-11-15 | 4374409 | ND |
| 2022-11-15 | 4374410 | 2.07 ppb |
| 2022-11-15 | 4374411 | 0.912 ppb |
| 2022-11-15 | 4374404 | ND |
| 2022-11-15 | 4374408 | ND |
| 2023-02-14 | 4412877 | ND |
| 2023-02-14 | 4412879 | 1.09 ppb |
| 2023-02-14 | 4412880 | ND |
| 2023-02-14 | 4412874 | 0.595 ppb |
| 2023-02-14 | 4412876 | 0.701 ppb |
| 2023-02-14 | 4412878 | ND |
| 2023-02-14 | 4412873 | ND |
| 2023-02-14 | 4412875 | 0.539 ppb |
| 2023-05-09 | 4452336 | ND |
| 2023-05-09 | 4452337 | 0.556 ppb |
| 2023-05-09 | 4452338 | ND |
| 2023-05-09 | 4452339 | ND |
| 2023-05-09 | 4452335 | 0.731 ppb |
| 2023-05-09 | 4452341 | 0.628 ppb |
| 2023-05-09 | 4452334 | ND |
| 2023-05-09 | 4452340 | 1.54 ppb |
| 2023-08-15 | 4499244 | ND |
| 2023-08-15 | 4499246 | 0.780 ppb |
| 2023-08-15 | 4499242 | 1.29 ppb |
| 2023-08-15 | 4499240 | ND |
| 2023-08-15 | 4499241 | 0.783 ppb |
| 2023-08-15 | 4499247 | 0.561 ppb |
| 2023-08-15 | 4499245 | ND |
| 2023-08-15 | 4499243 | ND |
| 2023-11-14 | 4548336 | 0.920 ppb |
| 2023-11-14 | 4548330 | 0.803 ppb |
| 2023-11-14 | 4548334 | 0.636 ppb |
| 2023-11-14 | 4548332 | 0.831 ppb |
| 2023-11-14 | 4548329 | 0.901 ppb |
| 2023-11-14 | 4548331 | 0.680 ppb |
| 2023-11-14 | 4548333 | 0.748 ppb |
| 2023-11-14 | 4548335 | 3.21 ppb |