Dibromochloromethane
Lewistown Boro Municipal Authority
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 | 0.705 ppb | 8 | 6 | ND - 1.24 ppb |
| 2015 | 0.789 ppb | 14 | 14 | 0.610 ppb - 1.03 ppb |
| 2016 | 0.807 ppb | 10 | 8 | ND - 2.03 ppb |
| 2017 | 0.523 ppb | 8 | 5 | ND - 0.990 ppb |
| 2018 | 0.820 ppb | 8 | 8 | 0.670 ppb - 1.03 ppb |
| 2019 | 0.408 ppb | 8 | 5 | ND - 0.930 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 | Lab ID | Result |
|---|---|---|
| 2014-02-13 | 4B13103-01 | 0.850 ppb |
| 2014-02-13 | 4B13103-02 | 0.660 ppb |
| 2014-05-15 | 4E16012-01 | 1.24 ppb |
| 2014-05-15 | 4E16012-02 | 1.05 ppb |
| 2014-08-14 | 4H14171-01 | 1.06 ppb |
| 2014-08-14 | 4H14171-02 | 0.780 ppb |
| 2014-11-13 | 4K13150-01 | ND |
| 2014-11-13 | 4K13150-02 | ND |
| 2015-02-17 | 12454264 | 0.880 ppb |
| 2015-02-17 | 12454263 | 0.630 ppb |
| 2015-05-14 | 12811110 | 0.980 ppb |
| 2015-05-14 | 12811109 | 0.810 ppb |
| 2015-05-14 | 12811107 | 0.750 ppb |
| 2015-05-14 | 12811108 | 0.800 ppb |
| 2015-08-13 | 13192734 | 0.850 ppb |
| 2015-08-13 | 13192731 | 0.610 ppb |
| 2015-08-13 | 13192733 | 0.820 ppb |
| 2015-08-13 | 13192732 | 0.630 ppb |
| 2015-11-12 | 13568991 | 1.03 ppb |
| 2015-11-12 | 13568990 | 0.940 ppb |
| 2015-11-12 | 13568988 | 0.620 ppb |
| 2015-11-12 | 13568989 | 0.700 ppb |
| 2016-02-11 | 13923715 | 0.570 ppb |
| 2016-02-11 | 13923714 | 0.530 ppb |
| 2016-02-11 | 13923717 | 0.730 ppb |
| 2016-02-11 | 13923716 | 0.650 ppb |
| 2016-05-12 | 14321703 | ND |
| 2016-05-12 | 14321702 | ND |
| 2016-08-11 | 14814509 | 1.74 ppb |
| 2016-08-11 | 14814510 | 2.03 ppb |
| 2016-11-15 | 15290454 | 1.08 ppb |
| 2016-11-15 | 15290453 | 0.740 ppb |
| 2017-02-14 | 15716741 | 0.820 ppb |
| 2017-02-14 | 15716742 | 0.870 ppb |
| 2017-05-11 | 16168237 | ND |
| 2017-05-11 | 16168238 | 0.990 ppb |
| 2017-08-15 | 16638195 | 0.650 ppb |
| 2017-08-15 | 16638196 | 0.850 ppb |
| 2017-11-13 | 17085258 | ND |
| 2017-11-13 | 17085257 | ND |
| 2018-02-15 | 8B15207-02 | 0.830 ppb |
| 2018-02-15 | 8B15207-01 | 0.670 ppb |
| 2018-05-15 | 8E16058-01 | 0.880 ppb |
| 2018-05-15 | 8E16058-02 | 0.680 ppb |
| 2018-08-14 | 8H14149-01 | 0.930 ppb |
| 2018-08-14 | 8H14149-02 | 0.720 ppb |
| 2018-11-13 | 8K13111-01 | 1.03 ppb |
| 2018-11-13 | 8K13111-02 | 0.820 ppb |
| 2019-02-14 | 9B14172-01 | 0.930 ppb |
| 2019-02-14 | 9B14172-02 | 0.580 ppb |
| 2019-05-16 | 9E16191-01 | 0.520 ppb |
| 2019-05-16 | 9E16191-02 | ND |
| 2019-08-15 | 9H15268-01 | ND |
| 2019-08-15 | 9H15268-02 | ND |
| 2019-11-14 | 9K15049-02 | 0.540 ppb |
| 2019-11-14 | 9K15049-01 | 0.690 ppb |