Bromoform
City of Redmond Water System
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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 | 0.198 ppb | 32 | 8 | ND - 1.04 ppb |
| 2019 | 0.143 ppb | 36 | 7 | ND - 0.922 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.145 ppb | 33 | 7 | ND - 0.815 ppb |
| 2022 | 0.0427 ppb | 33 | 2 | ND - 0.786 ppb |
| 2023 | 0.0844 ppb | 32 | 4 | ND - 0.867 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform is 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, harm to reproduction and child development, and change to fetal growth and development .
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-10 | ND | |
| 2018-01-10 | ND | |
| 2018-01-10 | 0.920 ppb | |
| 2018-01-10 | ND | |
| 2018-01-10 | ND | |
| 2018-01-10 | ND | |
| 2018-01-10 | ND | |
| 2018-01-10 | 0.620 ppb | |
| 2018-04-04 | ND | |
| 2018-04-04 | ND | |
| 2018-04-04 | 0.760 ppb | |
| 2018-04-04 | ND | |
| 2018-04-04 | ND | |
| 2018-04-04 | ND | |
| 2018-04-04 | ND | |
| 2018-04-04 | 0.600 ppb | |
| 2018-07-03 | ND | |
| 2018-07-03 | ND | |
| 2018-07-03 | 0.890 ppb | |
| 2018-07-03 | ND | |
| 2018-07-03 | ND | |
| 2018-07-03 | ND | |
| 2018-07-03 | ND | |
| 2018-07-03 | 0.680 ppb | |
| 2018-10-03 | ND | |
| 2018-10-03 | ND | |
| 2018-10-03 | 1.04 ppb | |
| 2018-10-03 | ND | |
| 2018-10-03 | ND | |
| 2018-10-03 | ND | |
| 2018-10-03 | ND | |
| 2018-10-03 | 0.830 ppb | |
| 2019-01-09 | ND | |
| 2019-01-09 | ND | |
| 2019-01-09 | 0.760 ppb | |
| 2019-01-09 | ND | |
| 2019-01-09 | ND | |
| 2019-01-09 | ND | |
| 2019-01-09 | ND | |
| 2019-01-09 | ND | |
| 2019-04-03 | ND | |
| 2019-04-03 | ND | |
| 2019-04-03 | 0.710 ppb | |
| 2019-04-03 | ND | |
| 2019-04-03 | ND | |
| 2019-04-03 | ND | |
| 2019-04-03 | ND | |
| 2019-04-03 | 0.570 ppb | |
| 2019-07-01 | ND | |
| 2019-07-01 | ND | |
| 2019-07-01 | 0.747 ppb | |
| 2019-07-01 | ND | |
| 2019-07-01 | ND | |
| 2019-07-01 | ND | |
| 2019-07-01 | ND | |
| 2019-07-01 | 0.608 ppb | |
| 2019-07-09 | ND | |
| 2019-07-09 | ND | |
| 2019-07-09 | ND | |
| 2019-07-09 | ND | |
| 2019-10-02 | ND | |
| 2019-10-02 | ND | |
| 2019-10-02 | 0.848 ppb | |
| 2019-10-02 | ND | |
| 2019-10-02 | ND | |
| 2019-10-02 | ND | |
| 2019-10-02 | ND | |
| 2019-10-02 | 0.922 ppb | |
| 2021-01-06 | 4064305 | 0.593 ppb |
| 2021-01-06 | 4064304 | ND |
| 2021-01-06 | 4064303 | ND |
| 2021-01-06 | 4064302 | ND |
| 2021-01-06 | 4064301 | 0.777 ppb |
| 2021-01-06 | 4064300 | ND |
| 2021-01-06 | 4064306 | ND |
| 2021-01-06 | 4064299 | ND |
| 2021-04-07 | 4101630 | ND |
| 2021-04-07 | 4101629 | 0.591 ppb |
| 2021-04-07 | 4101625 | 0.805 ppb |
| 2021-04-07 | 4101627 | ND |
| 2021-04-07 | 4101623 | ND |
| 2021-04-07 | 4101628 | ND |
| 2021-04-07 | 4101626 | ND |
| 2021-04-07 | 4101624 | ND |
| 2021-07-07 | 4172383 | ND |
| 2021-07-07 | 4172381 | 0.561 ppb |
| 2021-07-07 | 4172380 | ND |
| 2021-07-07 | 4172384 | ND |
| 2021-07-07 | 4172382 | ND |
| 2021-07-07 | 4172386 | ND |
| 2021-07-07 | 4172379 | ND |
| 2021-07-07 | 4172385 | 0.636 ppb |
| 2021-09-02 | 4178935 | ND |
| 2021-10-06 | 4195710 | ND |
| 2021-10-06 | 4195708 | ND |
| 2021-10-06 | 4195711 | ND |
| 2021-10-06 | 4195713 | ND |
| 2021-10-06 | 4195707 | ND |
| 2021-10-06 | 4195712 | ND |
| 2021-10-06 | 4195714 | ND |
| 2021-10-06 | 4195709 | 0.815 ppb |
| 2022-01-12 | 4230077 | ND |
| 2022-01-12 | 4230079 | ND |
| 2022-01-12 | 4230075 | 0.622 ppb |
| 2022-01-12 | 4230073 | ND |
| 2022-01-12 | 4230080 | ND |
| 2022-01-12 | 4230078 | ND |
| 2022-01-12 | 4230074 | ND |
| 2022-01-12 | 4230076 | ND |
| 2022-04-06 | 4270527 | ND |
| 2022-04-06 | 4270531 | ND |
| 2022-04-06 | 4270533 | ND |
| 2022-04-06 | 4270529 | ND |
| 2022-04-06 | 4270530 | ND |
| 2022-04-06 | 4270532 | ND |
| 2022-04-06 | 4270526 | ND |
| 2022-04-06 | 4270528 | ND |
| 2022-07-06 | 4310274 | ND |
| 2022-07-06 | 4310272 | ND |
| 2022-07-06 | 4310270 | ND |
| 2022-07-06 | 4310269 | 0.786 ppb |
| 2022-07-06 | 4310267 | ND |
| 2022-07-06 | 4310268 | ND |
| 2022-07-06 | 4310273 | ND |
| 2022-07-06 | 4310271 | ND |
| 2022-07-27 | 4325450 | ND |
| 2022-10-05 | 4361960 | ND |
| 2022-10-05 | 4361959 | ND |
| 2022-10-05 | 4361957 | ND |
| 2022-10-05 | 4361955 | ND |
| 2022-10-05 | 4361954 | ND |
| 2022-10-05 | 4361958 | ND |
| 2022-10-05 | 4361956 | ND |
| 2022-10-05 | 4361953 | ND |
| 2023-01-03 | 4397705 | ND |
| 2023-01-03 | 4397703 | ND |
| 2023-01-03 | 4397701 | ND |
| 2023-01-03 | 4397707 | ND |
| 2023-01-03 | 4397700 | ND |
| 2023-01-03 | 4397704 | ND |
| 2023-01-03 | 4397706 | ND |
| 2023-01-03 | 4397702 | ND |
| 2023-04-07 | 4442064 | ND |
| 2023-04-07 | 4442063 | ND |
| 2023-04-07 | 4442060 | ND |
| 2023-04-07 | 4442067 | ND |
| 2023-04-07 | 4442062 | 0.682 ppb |
| 2023-04-07 | 4442065 | ND |
| 2023-04-07 | 4442061 | ND |
| 2023-04-07 | 4442066 | 0.539 ppb |
| 2023-07-07 | 4482800 | ND |
| 2023-07-07 | 4482798 | ND |
| 2023-07-07 | 4482802 | ND |
| 2023-07-07 | 4482804 | ND |
| 2023-07-07 | 4482797 | ND |
| 2023-07-07 | 4482801 | ND |
| 2023-07-07 | 4482799 | 0.613 ppb |
| 2023-07-07 | 4482803 | ND |
| 2023-10-02 | 4529370 | 0.867 ppb |
| 2023-10-02 | 4529369 | ND |
| 2023-10-02 | 4529368 | ND |
| 2023-10-02 | 4529375 | ND |
| 2023-10-02 | 4529371 | ND |
| 2023-10-02 | 4529373 | ND |
| 2023-10-02 | 4529374 | ND |
| 2023-10-02 | 4529372 | ND |