Bromoform
Central Brown Co. Water Authority
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 |
|---|---|---|---|---|
| 2014 | 0.166 ppb | 16 | 8 | ND - 0.470 ppb |
| 2015 | 0.358 ppb | 4 | 4 | 0.340 ppb - 0.380 ppb |
| 2016 | 0.109 ppb | 12 | 4 | ND - 0.380 ppb |
| 2017 | 0.0892 ppb | 13 | 6 | ND - 0.260 ppb |
| 2018 | 0.0491 ppb | 11 | 2 | ND - 0.270 ppb |
| 2019 | 0.0500 ppb | 9 | 2 | ND - 0.240 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-15 | 4010407-02 | ND |
| 2014-01-15 | 4010407-03 | ND |
| 2014-01-15 | 4010407-01 | ND |
| 2014-01-15 | 4010407-04 | ND |
| 2014-04-15 | 780547 | 0.230 ppb |
| 2014-04-15 | 780548 | 0.250 ppb |
| 2014-04-15 | 780546 | 0.260 ppb |
| 2014-04-15 | 780545 | 0.270 ppb |
| 2014-07-09 | 801956 | 0.470 ppb |
| 2014-07-09 | 801957 | 0.430 ppb |
| 2014-07-09 | 801958 | 0.400 ppb |
| 2014-07-09 | 801959 | 0.340 ppb |
| 2014-10-07 | 823886 | ND |
| 2014-10-07 | 823889 | ND |
| 2014-10-07 | 823887 | ND |
| 2014-10-07 | 823888 | ND |
| 2015-01-13 | 838754 | 0.340 ppb |
| 2015-01-13 | 838753 | 0.350 ppb |
| 2015-01-13 | 838751 | 0.360 ppb |
| 2015-01-13 | 838752 | 0.380 ppb |