Bromoform
Town of Ferriday 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 | 0.135 ppb | 16 | 4 | ND - 0.550 ppb |
| 2019 | 0.795 ppb | 16 | 8 | ND - 2.30 ppb |
| 2020 | 0.456 ppb | 10 | 6 | ND - 0.830 ppb |
| 2021 | 0.358 ppb | 8 | 5 | ND - 0.640 ppb |
| 2022 | 0.443 ppb | 8 | 6 | ND - 0.690 ppb |
| 2023 | 0.699 ppb | 8 | 8 | 0.460 ppb - 0.980 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 |
|---|---|---|
| 2018-02-20 | 35375729001 | ND |
| 2018-02-20 | 35375729002 | ND |
| 2018-02-20 | 35375729002 | ND |
| 2018-02-20 | 35375729001 | ND |
| 2018-05-09 | 35391497002 | ND |
| 2018-05-09 | 35391497001 | ND |
| 2018-05-09 | 35391497002 | ND |
| 2018-05-09 | 35391497001 | ND |
| 2018-08-01 | 35408243001 | ND |
| 2018-08-01 | 35408243002 | ND |
| 2018-08-01 | 35408243001 | ND |
| 2018-08-01 | 35408243002 | ND |
| 2018-11-27 | 35433612001 | 0.530 ppb |
| 2018-11-27 | 35433612001 | 0.530 ppb |
| 2018-11-27 | 35433612002 | 0.550 ppb |
| 2018-11-27 | 35433612002 | 0.550 ppb |
| 2019-02-13 | 35448501001 | ND |
| 2019-02-13 | 35448501002 | ND |
| 2019-02-13 | 35448501001 | ND |
| 2019-02-13 | 35448501002 | ND |
| 2019-05-07 | 35467715001 | 0.890 ppb |
| 2019-05-07 | 35467715002 | 0.970 ppb |
| 2019-05-07 | 35467715001 | 0.890 ppb |
| 2019-05-07 | 35467715002 | 0.970 ppb |
| 2019-08-21 | 35492680002 | 2.20 ppb |
| 2019-08-21 | 35492680001 | 2.30 ppb |
| 2019-08-21 | 35492680001 | 2.30 ppb |
| 2019-08-21 | 35492680002 | 2.20 ppb |
| 2019-11-13 | 35512677001 | ND |
| 2019-11-13 | 35512677002 | ND |
| 2019-11-13 | 35512677002 | ND |
| 2019-11-13 | 35512677001 | ND |
| 2020-02-03 | 35528432002 | ND |
| 2020-02-03 | 35528432001 | ND |
| 2020-05-06 | 35548696001 | 0.820 ppb |
| 2020-05-06 | 35548696002 | 0.830 ppb |
| 2020-05-27 | 35553125001 | ND |
| 2020-05-27 | 35553125002 | ND |
| 2020-08-04 | 35567949001 | 0.660 ppb |
| 2020-08-04 | 35567949002 | 0.630 ppb |
| 2020-11-18 | 35593798002 | 0.810 ppb |
| 2020-11-18 | 35593798001 | 0.810 ppb |
| 2021-02-03 | 35609856001 | 0.620 ppb |
| 2021-02-03 | 35609856002 | 0.640 ppb |
| 2021-05-12 | 35633591001 | 0.470 ppb |
| 2021-05-12 | 35633591002 | 0.490 ppb |
| 2021-08-10 | 35655900001 | ND |
| 2021-08-10 | 35655900002 | ND |
| 2021-11-03 | 35676396001 | ND |
| 2021-11-03 | 35676396002 | 0.640 ppb |
| 2022-02-22 | 35699263002 | ND |
| 2022-02-22 | 35699263001 | ND |
| 2022-05-12 | 35717465002 | 0.630 ppb |
| 2022-05-12 | 35717465001 | 0.510 ppb |
| 2022-08-10 | 35739088002 | 0.500 ppb |
| 2022-08-10 | 35739088001 | 0.550 ppb |
| 2022-11-02 | 35757711002 | 0.690 ppb |
| 2022-11-02 | 35757711001 | 0.660 ppb |
| 2023-02-01 | 35776767001 | 0.810 ppb |
| 2023-02-01 | 35776767002 | 0.850 ppb |
| 2023-05-10 | 35799268001 | 0.690 ppb |
| 2023-05-10 | 35799268002 | 0.710 ppb |
| 2023-08-28 | 35824706001 | 0.460 ppb |
| 2023-08-28 | 35824706002 | 0.490 ppb |
| 2023-11-02 | 35838964001 | 0.600 ppb |
| 2023-11-02 | 35838964002 | 0.980 ppb |