Dibromochloromethane
Wilbraham Water Department (MWRA)
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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 | 0.334 ppb | 26 | 12 | ND - 0.960 ppb |
| 2015 | 0.714 ppb | 8 | 7 | ND - 1.10 ppb |
| 2016 | 0.828 ppb | 8 | 7 | ND - 1.25 ppb |
| 2017 | 1.09 ppb | 8 | 8 | 0.820 ppb - 1.36 ppb |
| 2018 | 0.768 ppb | 8 | 8 | 0.610 ppb - 1.01 ppb |
| 2019 | 0.373 ppb | 7 | 4 | ND - 0.750 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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 | Result |
|---|---|
| 2015-02-17 | 0.650 ppb |
| 2015-02-17 | 0.960 ppb |
| 2015-05-21 | ND |
| 2015-05-21 | 0.600 ppb |
| 2015-08-18 | 0.590 ppb |
| 2015-08-18 | 0.920 ppb |
| 2015-11-17 | 0.890 ppb |
| 2015-11-17 | 1.10 ppb |
| 2016-02-16 | 0.850 ppb |
| 2016-02-16 | 1.000 ppb |
| 2016-05-17 | 0.850 ppb |
| 2016-05-17 | 0.940 ppb |
| 2016-08-16 | ND |
| 2016-08-18 | 0.830 ppb |
| 2016-11-14 | 1.25 ppb |
| 2016-11-14 | 0.900 ppb |
| 2017-02-14 | 0.990 ppb |
| 2017-02-14 | 1.25 ppb |
| 2017-05-16 | 0.940 ppb |
| 2017-05-16 | 1.07 ppb |
| 2017-08-14 | 0.820 ppb |
| 2017-08-14 | 0.980 ppb |
| 2017-11-13 | 1.36 ppb |
| 2017-11-13 | 1.33 ppb |
| 2018-02-13 | 0.970 ppb |
| 2018-02-13 | 0.730 ppb |
| 2018-05-15 | 0.810 ppb |
| 2018-05-15 | 1.01 ppb |
| 2018-08-20 | 0.620 ppb |
| 2018-08-20 | 0.660 ppb |
| 2018-11-13 | 0.730 ppb |
| 2018-11-13 | 0.610 ppb |
| 2019-02-19 | 0.580 ppb |
| 2019-02-19 | ND |
| 2019-05-20 | 0.630 ppb |
| 2019-08-19 | ND |
| 2019-08-19 | ND |
| 2019-11-18 | 0.650 ppb |
| 2019-11-18 | 0.750 ppb |