Dibromochloromethane
Northborough 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 | N/A | 0 | 0 | N/A |
| 2015 | 0.810 ppb | 16 | 16 | 0.550 ppb - 1.09 ppb |
| 2016 | 0.819 ppb | 17 | 17 | 0.640 ppb - 1.04 ppb |
| 2017 | 1.04 ppb | 16 | 16 | 0.890 ppb - 1.20 ppb |
| 2018 | 1.01 ppb | 8 | 8 | 0.880 ppb - 1.17 ppb |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|
| 2015-02-05 | 0.600 ppb |
| 2015-02-05 | 0.630 ppb |
| 2015-02-05 | 0.550 ppb |
| 2015-02-05 | 0.660 ppb |
| 2015-05-05 | 0.880 ppb |
| 2015-05-05 | 1.09 ppb |
| 2015-05-05 | 0.930 ppb |
| 2015-05-05 | 0.840 ppb |
| 2015-08-04 | 0.910 ppb |
| 2015-08-04 | 0.830 ppb |
| 2015-08-04 | 0.850 ppb |
| 2015-08-04 | 0.860 ppb |
| 2015-11-03 | 0.870 ppb |
| 2015-11-03 | 0.810 ppb |
| 2015-11-03 | 0.750 ppb |
| 2015-11-03 | 0.900 ppb |
| 2016-02-02 | 0.730 ppb |
| 2016-02-02 | 0.860 ppb |
| 2016-02-02 | 0.800 ppb |
| 2016-02-02 | 0.790 ppb |
| 2016-05-03 | 1.03 ppb |
| 2016-05-03 | 1.04 ppb |
| 2016-05-03 | 0.900 ppb |
| 2016-05-03 | 0.940 ppb |
| 2016-08-02 | 0.880 ppb |
| 2016-08-02 | 0.730 ppb |
| 2016-08-02 | 0.870 ppb |
| 2016-08-02 | 0.830 ppb |
| 2016-11-02 | 0.640 ppb |
| 2016-11-02 | 0.670 ppb |
| 2016-11-02 | 0.720 ppb |
| 2016-11-02 | 0.670 ppb |
| 2016-11-29 | 0.830 ppb |
| 2017-02-07 | 0.940 ppb |
| 2017-02-07 | 0.890 ppb |
| 2017-02-07 | 1.000 ppb |
| 2017-02-07 | 0.920 ppb |
| 2017-05-02 | 0.900 ppb |
| 2017-05-02 | 0.960 ppb |
| 2017-05-02 | 0.970 ppb |
| 2017-05-02 | 0.930 ppb |
| 2017-08-01 | 1.13 ppb |
| 2017-08-01 | 0.980 ppb |
| 2017-08-01 | 1.19 ppb |
| 2017-08-01 | 1.10 ppb |
| 2017-11-07 | 1.16 ppb |
| 2017-11-07 | 1.17 ppb |
| 2017-11-07 | 1.20 ppb |
| 2017-11-07 | 1.16 ppb |
| 2018-02-06 | 0.980 ppb |
| 2018-02-06 | 0.990 ppb |
| 2018-02-06 | 0.930 ppb |
| 2018-02-06 | 0.880 ppb |
| 2018-05-01 | 1.17 ppb |
| 2018-05-01 | 1.08 ppb |
| 2018-05-01 | 1.05 ppb |
| 2018-05-01 | 1.02 ppb |