Bromoform
Weston Municipal Utilities
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 | 0.475 ppb | 11 | 10 | ND - 0.800 ppb |
| 2015 | 0.557 ppb | 3 | 3 | 0.250 ppb - 0.850 ppb |
| 2016 | 0.423 ppb | 3 | 3 | 0.270 ppb - 0.510 ppb |
| 2017 | 0.337 ppb | 7 | 5 | ND - 0.760 ppb |
| 2018 | 0.163 ppb | 3 | 1 | ND - 0.490 ppb |
| 2019 | 0.157 ppb | 3 | 2 | ND - 0.260 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 |
|---|---|---|
| 2014-03-25 | 776475 | 0.240 ppb |
| 2014-03-25 | 776482 | 0.310 ppb |
| 2014-03-25 | 776485 | 0.360 ppb |
| 2014-03-25 | 776488 | 0.390 ppb |
| 2014-03-25 | 776487 | 0.430 ppb |
| 2014-03-25 | 776479 | 0.630 ppb |
| 2014-03-25 | 776472 | ND |
| 2014-06-10 | 795569 | 0.670 ppb |
| 2014-06-10 | 795570 | 0.750 ppb |
| 2014-08-19 | 811524 | 0.650 ppb |
| 2014-08-19 | 811523 | 0.800 ppb |
| 2015-03-18 | 849080 | 0.250 ppb |
| 2015-05-12 | 859337 | 0.570 ppb |
| 2015-07-29 | 873825 | 0.850 ppb |
| 2016-03-15 | 910347 | 0.270 ppb |
| 2016-06-15 | 927126 | 0.490 ppb |
| 2016-08-30 | 942166 | 0.510 ppb |
| 2017-04-18 | 983840 | ND |
| 2017-04-18 | 983874 | ND |
| 2017-04-18 | 983868 | 0.240 ppb |
| 2017-04-18 | 983865 | 0.250 ppb |
| 2017-04-18 | 983877 | 0.500 ppb |
| 2017-04-18 | 983871 | 0.610 ppb |
| 2017-08-09 | 1010138 | 0.760 ppb |
| 2018-05-21 | 1056552 | ND |
| 2018-05-21 | 1056557 | 0.490 ppb |
| 2018-08-08 | 1072508 | ND |
| 2019-04-15 | 1115122 | 0.210 ppb |
| 2019-05-21 | 1122328 | 0.260 ppb |
| 2019-09-18 | 1149284 | ND |