Bromoform
Fort Johnson South 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 | ND | 4 | 0 | ND |
| 2019 | 0.230 ppb | 4 | 2 | ND - 0.460 ppb |
| 2020 | ND | 2 | 0 | ND |
| 2021 | 0.113 ppb | 6 | 1 | ND - 0.680 ppb |
| 2022 | 0.575 ppb | 16 | 14 | ND - 0.910 ppb |
| 2023 | 0.607 ppb | 16 | 14 | ND - 1.10 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 |
|---|---|---|
| 2018-07-25 | 35407305001 | ND |
| 2018-07-25 | 35407305002 | ND |
| 2018-07-25 | 35407305002 | ND |
| 2018-07-25 | 35407305001 | ND |
| 2019-07-25 | 35485195002 | ND |
| 2019-07-25 | 35485195001 | 0.460 ppb |
| 2019-07-25 | 35485195001 | 0.460 ppb |
| 2019-07-25 | 35485195002 | ND |
| 2020-07-22 | 35565518001 | ND |
| 2020-07-22 | 35565518002 | ND |
| 2021-07-08 | 35646122002 | ND |
| 2021-07-08 | 35646122001 | ND |
| 2021-10-25 | 35673978003 | ND |
| 2021-10-25 | 35673978004 | ND |
| 2021-10-25 | 35673978002 | ND |
| 2021-10-25 | 35673978001 | 0.680 ppb |
| 2022-01-19 | 35691935004 | 0.910 ppb |
| 2022-01-19 | 35691935003 | ND |
| 2022-01-19 | 35691935002 | ND |
| 2022-01-19 | 35691935001 | 0.610 ppb |
| 2022-04-20 | 35712728004 | 0.530 ppb |
| 2022-04-20 | 35712728003 | 0.580 ppb |
| 2022-04-20 | 35712728002 | 0.860 ppb |
| 2022-04-20 | 35712728001 | 0.780 ppb |
| 2022-07-07 | 35730077003 | 0.560 ppb |
| 2022-07-07 | 35730077002 | 0.890 ppb |
| 2022-07-07 | 35730077001 | 0.720 ppb |
| 2022-07-07 | 35730077004 | 0.710 ppb |
| 2022-10-03 | 35750343004 | 0.600 ppb |
| 2022-10-03 | 35750343003 | 0.440 ppb |
| 2022-10-03 | 35750343002 | 0.550 ppb |
| 2022-10-03 | 35750343001 | 0.460 ppb |
| 2023-01-05 | 35770746004 | 0.670 ppb |
| 2023-01-05 | 35770746003 | 0.390 ppb |
| 2023-01-05 | 35770746002 | 0.390 ppb |
| 2023-01-05 | 35770746001 | ND |
| 2023-04-12 | 35792471001 | 0.490 ppb |
| 2023-04-12 | 35792471002 | 0.740 ppb |
| 2023-04-12 | 35792471003 | ND |
| 2023-04-12 | 35792471004 | 0.690 ppb |
| 2023-07-05 | 35811228001 | 0.610 ppb |
| 2023-07-05 | 35811228002 | 0.860 ppb |
| 2023-07-05 | 35811228003 | 0.450 ppb |
| 2023-07-05 | 35811228004 | 0.780 ppb |
| 2023-10-16 | 35835687004 | 0.830 ppb |
| 2023-10-16 | 35835687003 | 0.750 ppb |
| 2023-10-16 | 35835687002 | 0.960 ppb |
| 2023-10-16 | 35835687001 | 1.10 ppb |