Dibromochloromethane
City of Manassas
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.
96
Samples
0
Samples exceeding legal limit (MCL)
95
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.626 ppb | 16 | 15 | ND - 0.880 ppb |
| 2015 | 0.944 ppb | 16 | 16 | 0.520 ppb - 1.24 ppb |
| 2016 | 1.09 ppb | 16 | 16 | 0.660 ppb - 1.65 ppb |
| 2017 | 0.903 ppb | 16 | 16 | 0.650 ppb - 1.36 ppb |
| 2018 | 0.957 ppb | 16 | 16 | 0.700 ppb - 1.56 ppb |
| 2019 | 0.921 ppb | 16 | 16 | 0.360 ppb - 1.30 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 |
|---|---|---|
| 2014-02-03 | FW13112511-02_TH | 0.880 ppb |
| 2014-02-03 | FW13112511-04_TH | 0.610 ppb |
| 2014-02-03 | FW13112511-01_TH | 0.680 ppb |
| 2014-02-03 | FW13112511-03_TH | 0.670 ppb |
| 2014-05-02 | FW14012203-03_TH | 0.810 ppb |
| 2014-05-02 | FW14012203-04_TH | 0.630 ppb |
| 2014-05-02 | FW14012203-01_TH | 0.680 ppb |
| 2014-05-02 | FW14012203-02_TH | 0.730 ppb |
| 2014-08-05 | FW14050102-01_TH | 0.680 ppb |
| 2014-08-05 | FW14050102-03_TH | 0.650 ppb |
| 2014-08-05 | FW14050102-04_TH | 0.640 ppb |
| 2014-08-05 | FW14050102-02_TH | 0.700 ppb |
| 2014-11-04 | FW14072407-01_TH | 0.570 ppb |
| 2014-11-04 | FW14072407-04_TH | 0.550 ppb |
| 2014-11-04 | FW14072407-02_TH | 0.540 ppb |
| 2014-11-04 | FW14072407-03_TH | ND |
| 2015-02-03 | 00125-FAIRFAX CO | 0.660 ppb |
| 2015-02-03 | 00125-FAIRFAX CO | 0.520 ppb |
| 2015-02-03 | 00125-FAIRFAX CO | 0.550 ppb |
| 2015-02-03 | 00125-FAIRFAX CO | 0.580 ppb |
| 2015-05-05 | 00125-FAIRFAX CO | 0.990 ppb |
| 2015-05-05 | 00125-FAIRFAX CO | 0.980 ppb |
| 2015-05-05 | 00125-FAIRFAX CO | 0.920 ppb |
| 2015-05-05 | 00125-FAIRFAX CO | 1.15 ppb |
| 2015-08-04 | 00125-FAIRFAX CO | 1.19 ppb |
| 2015-08-04 | 00125-FAIRFAX CO | 1.24 ppb |
| 2015-08-04 | 00125-FAIRFAX CO | 1.24 ppb |
| 2015-08-04 | 00125-FAIRFAX CO | 1.24 ppb |
| 2015-11-04 | 00125-FAIRFAX CO | 1.01 ppb |
| 2015-11-04 | 00125-FAIRFAX CO | 0.970 ppb |
| 2015-11-04 | 00125-FAIRFAX CO | 0.940 ppb |
| 2015-11-04 | 00125-FAIRFAX CO | 0.930 ppb |
| 2016-02-02 | FW151022009-01_T | 0.740 ppb |
| 2016-02-02 | FW151022009-02_T | 0.730 ppb |
| 2016-02-02 | FW151022009-03_T | 0.690 ppb |
| 2016-02-02 | FW151022009-04_T | 0.660 ppb |
| 2016-05-03 | FW160121027-02_T | 1.26 ppb |
| 2016-05-03 | FW160121027-01_T | 1.25 ppb |
| 2016-05-03 | FW160121027-03_T | 1.16 ppb |
| 2016-05-03 | FW160121027-04_T | 1.08 ppb |
| 2016-08-02 | FW160107002-02_T | 1.65 ppb |
| 2016-08-02 | FW160107002-01_T | 1.64 ppb |
| 2016-08-02 | FW160107002-03_T | 1.52 ppb |
| 2016-08-02 | FW160107002-04_T | 1.50 ppb |
| 2016-11-01 | FW160714008-03_T | 0.920 ppb |
| 2016-11-01 | FW160714008-04_T | 0.920 ppb |
| 2016-11-01 | FW160714008-01_T | 0.880 ppb |
| 2016-11-01 | FW160714008-02_T | 0.870 ppb |
| 2017-02-01 | FW170105006-03_T | 0.810 ppb |
| 2017-02-01 | FW170105006-04_T | 0.800 ppb |
| 2017-02-01 | FW170105006-01_T | 0.850 ppb |
| 2017-02-01 | FW170105006-02_T | 0.820 ppb |
| 2017-05-02 | FW150623085-03_T | 1.33 ppb |
| 2017-05-02 | FW150623085-04_T | 1.13 ppb |
| 2017-05-02 | FW150623085-02_T | 1.24 ppb |
| 2017-05-02 | FW150623085-01_T | 1.36 ppb |
| 2017-08-01 | FW170414005-01_T | 0.860 ppb |
| 2017-08-01 | FW170414005-04_T | 0.790 ppb |
| 2017-08-01 | FW170414005-02_T | 0.820 ppb |
| 2017-08-01 | FW170414005-03_T | 0.860 ppb |
| 2017-11-01 | FW171002010-02_T | 0.690 ppb |
| 2017-11-01 | FW171002010-03_T | 0.690 ppb |
| 2017-11-01 | FW171002010-04_T | 0.650 ppb |
| 2017-11-01 | FW171002010-01_T | 0.740 ppb |
| 2018-02-01 | FW171219014-04_T | 0.700 ppb |
| 2018-02-01 | FW171219014-03_T | 0.700 ppb |
| 2018-02-01 | FW171219014-02_T | 0.700 ppb |
| 2018-02-01 | FW171219014-01_T | 0.770 ppb |
| 2018-05-01 | FW180111004-04_T | 1.33 ppb |
| 2018-05-01 | FW180111004-01_T | 1.56 ppb |
| 2018-05-01 | FW180111004-02_T | 1.25 ppb |
| 2018-05-01 | FW180111004-03_T | 1.29 ppb |
| 2018-08-01 | FW180419006-04_T | 0.720 ppb |
| 2018-08-01 | FW180419006-03_T | 0.790 ppb |
| 2018-08-01 | FW180419006-02_T | 0.810 ppb |
| 2018-08-01 | FW180419006-01_T | 0.790 ppb |
| 2018-11-01 | FW180716035-01_T | 1.02 ppb |
| 2018-11-01 | FW180716035-02_T | 0.940 ppb |
| 2018-11-01 | FW180716035-03_T | 0.960 ppb |
| 2018-11-01 | FW180716035-04_T | 0.980 ppb |
| 2019-02-05 | 08_02052019_THM | 0.500 ppb |
| 2019-02-05 | 36_02052019_THM | 0.500 ppb |
| 2019-02-05 | 41_02052019_THM | 0.600 ppb |
| 2019-02-05 | 44_02052019_THM | 0.360 ppb |
| 2019-05-06 | 36_05062019_THM | 0.900 ppb |
| 2019-05-06 | 44_05062019_THM | 0.990 ppb |
| 2019-05-06 | 42_05062019_THM | 1.20 ppb |
| 2019-05-06 | 41_05062019_THM | 1.09 ppb |
| 2019-08-05 | 41_08052019_THM | 1.30 ppb |
| 2019-08-05 | 44_08052019_THM | 1.30 ppb |
| 2019-08-05 | 42_08052019_THM | 1.30 ppb |
| 2019-08-05 | 36_08052019_THM | 1.000 ppb |
| 2019-11-04 | 44_11042019_THM | 0.980 ppb |
| 2019-11-04 | 42_11042019_THM | 0.900 ppb |
| 2019-11-04 | 41_11042019_THM | 0.980 ppb |
| 2019-11-04 | 36_11042019_THM | 0.840 ppb |