Bromodichloromethane
Marin Municipal Water District
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 8.19 ppb | 40 | 40 | 3.90 ppb - 15.7 ppb |
2015 | 9.56 ppb | 43 | 43 | 4.30 ppb - 16.2 ppb |
2016 | 9.45 ppb | 42 | 42 | 5.70 ppb - 15.7 ppb |
2017 | 5.75 ppb | 41 | 41 | 3.22 ppb - 10.6 ppb |
2018 | 7.89 ppb | 41 | 41 | 3.60 ppb - 12.9 ppb |
2019 | 6.81 ppb | 35 | 35 | 4.00 ppb - 13.6 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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 |
---|---|---|
2014-02-10 | 7747-004-1205 | 9.60 ppb |
2014-02-10 | 7747-005-0740 | 4.00 ppb |
2014-02-10 | 7747-011-1110 | 9.00 ppb |
2014-02-10 | 7747-016-1145 | 3.90 ppb |
2014-02-10 | 7747-025-1050 | 7.50 ppb |
2014-02-10 | 7747-028-0945 | 7.40 ppb |
2014-02-10 | 7747-029-0945 | 7.20 ppb |
2014-02-10 | 7747-030-1255 | 5.20 ppb |
2014-02-10 | 7747-032-0820 | 6.90 ppb |
2014-02-10 | 7747-034-0840 | 4.30 ppb |
2014-05-05 | 9590-005-1200 | 6.80 ppb |
2014-05-12 | 7747-004-1420 | 6.50 ppb |
2014-05-12 | 7747-005-0755 | 5.50 ppb |
2014-05-12 | 7747-011-1145 | 5.40 ppb |
2014-05-12 | 7747-016-1420 | 5.00 ppb |
2014-05-12 | 7747-025-0800 | 8.70 ppb |
2014-05-12 | 7747-028-1000 | 8.50 ppb |
2014-05-12 | 7747-029-1105 | 5.60 ppb |
2014-05-12 | 7747-030-0855 | 6.00 ppb |
2014-05-12 | 7747-032-0950 | 5.70 ppb |
2014-05-12 | 7747-034-0955 | 5.70 ppb |
2014-08-11 | 1610-004-1050 | 10.6 ppb |
2014-08-11 | 1610-011-0915 | 13.6 ppb |
2014-08-11 | 1610-016-0835 | 9.67 ppb |
2014-08-11 | 1610-025-1150 | 11.4 ppb |
2014-08-11 | 1610-028-1015 | 11.3 ppb |
2014-08-11 | 1610-030-1220 | 13.8 ppb |
2014-08-11 | 1610-032-1150 | 12.0 ppb |
2014-08-11 | 1610-034-1000 | 14.0 ppb |
2014-08-11 | 1610-034-1340 | 10.6 ppb |
2014-11-10 | 7747-004-1210 | 13.2 ppb |
2014-11-10 | 7747-005-0820 | 4.10 ppb |
2014-11-10 | 7747-011-1125 | 5.50 ppb |
2014-11-10 | 7747-016-1155 | 6.60 ppb |
2014-11-10 | 7747-025-1010 | 12.4 ppb |
2014-11-10 | 7747-028-1100 | 15.7 ppb |
2014-11-10 | 7747-029-1045 | 8.70 ppb |
2014-11-10 | 7747-030-1305 | 5.90 ppb |
2014-11-10 | 7747-032-0950 | 9.50 ppb |
2014-11-10 | 7747-034-0915 | 4.70 ppb |
2015-02-09 | 7747-004-1350 | 8.80 ppb |
2015-02-09 | 7747-005-0750 | 6.90 ppb |
2015-02-09 | 7747-011-1225 | 7.30 ppb |
2015-02-09 | 7747-016-1405 | 8.70 ppb |
2015-02-09 | 7747-025-0745 | 8.70 ppb |
2015-02-09 | 7747-028-0910 | 12.3 ppb |
2015-02-09 | 7747-029-1135 | 7.40 ppb |
2015-02-09 | 7747-030-0920 | 7.20 ppb |
2015-02-09 | 7747-032-1015 | 5.70 ppb |
2015-02-09 | 7747-034-1055 | 5.70 ppb |
2015-05-04 | 1644-005-0815 | 4.30 ppb |
2015-05-11 | 7747-004-0850 | 10.8 ppb |
2015-05-11 | 7747-005-0800 | 5.30 ppb |
2015-05-11 | 7747-011-1135 | 13.1 ppb |
2015-05-11 | 7747-016-1350 | 6.10 ppb |
2015-05-11 | 7747-025-0800 | 10.9 ppb |
2015-05-11 | 7747-028-0950 | 10.6 ppb |
2015-05-11 | 7747-029-1040 | 12.6 ppb |
2015-05-11 | 7747-030-1315 | 8.40 ppb |
2015-05-11 | 7747-032-1310 | 11.2 ppb |
2015-05-11 | 7747-034-1035 | 5.20 ppb |
2015-05-26 | 7747-004-0820 | 11.8 ppb |
2015-05-26 | 7747-011-1025 | 14.5 ppb |
2015-08-10 | 7747-004-1015 | 10.8 ppb |
2015-08-10 | 7747-005-0650 | 6.40 ppb |
2015-08-10 | 7747-011-1305 | 6.10 ppb |
2015-08-10 | 7747-016-0900 | 10.8 ppb |
2015-08-10 | 7747-025-1035 | 11.5 ppb |
2015-08-10 | 7747-028-1145 | 10.4 ppb |
2015-08-10 | 7747-029-1200 | 10.4 ppb |
2015-08-10 | 7747-030-0820 | 6.20 ppb |
2015-08-10 | 7747-032-0900 | 12.5 ppb |
2015-08-10 | 7747-034-0845 | 5.20 ppb |
2015-11-10 | 7747-004-1050 | 11.5 ppb |
2015-11-10 | 7747-005-1230 | 5.70 ppb |
2015-11-10 | 7747-011-0920 | 15.5 ppb |
2015-11-10 | 7747-016-1443 | 12.9 ppb |
2015-11-10 | 7747-025-0845 | 12.0 ppb |
2015-11-10 | 7747-028-0930 | 10.3 ppb |
2015-11-10 | 7747-029-1015 | 16.2 ppb |
2015-11-10 | 7747-030-0835 | 14.4 ppb |
2015-11-10 | 7747-032-1145 | 13.5 ppb |
2015-11-10 | 7747-034-1130 | 5.20 ppb |
2016-02-10 | 7747-004-0950 | 6.90 ppb |
2016-02-10 | 7747-005-1015 | 9.20 ppb |
2016-02-10 | 7747-011-1140 | 8.10 ppb |
2016-02-10 | 7747-016-0920 | 7.00 ppb |
2016-02-10 | 7747-025-0830 | 8.30 ppb |
2016-02-10 | 7747-028-0750 | 10.7 ppb |
2016-02-10 | 7747-029-1050 | 9.10 ppb |
2016-02-10 | 7747-030-0750 | 8.00 ppb |
2016-02-10 | 7747-032-0845 | 8.70 ppb |
2016-02-10 | 7747-034-1100 | 8.80 ppb |
2016-05-09 | 7747-004-1310 | 9.30 ppb |
2016-05-09 | 7747-005-0910 | 6.70 ppb |
2016-05-09 | 7747-011-1055 | 13.3 ppb |
2016-05-09 | 7747-016-0835 | 6.10 ppb |
2016-05-09 | 7747-025-0730 | 9.00 ppb |
2016-05-09 | 7747-028-0835 | 8.10 ppb |
2016-05-09 | 7747-029-1015 | 13.2 ppb |
2016-05-09 | 7747-030-0820 | 11.4 ppb |
2016-05-09 | 7747-032-0915 | 11.4 ppb |
2016-05-09 | 7747-034-1010 | 6.40 ppb |
2016-05-16 | 7747-011-0001 | 14.1 ppb |
2016-05-20 | 7747-004-0930 | 14.4 ppb |
2016-08-08 | 7747-004-1335 | 10.3 ppb |
2016-08-08 | 7747-005-0720 | 6.20 ppb |
2016-08-08 | 7747-011-1155 | 5.70 ppb |
2016-08-08 | 7747-016-1250 | 7.50 ppb |
2016-08-08 | 7747-025-1155 | 10.5 ppb |
2016-08-08 | 7747-028-1125 | 9.70 ppb |
2016-08-08 | 7747-029-1120 | 6.10 ppb |
2016-08-08 | 7747-030-1015 | 5.80 ppb |
2016-08-08 | 7747-032-1035 | 6.50 ppb |
2016-08-08 | 7747-034-0925 | 6.70 ppb |
2016-11-14 | 7747-004-0950 | 10.8 ppb |
2016-11-14 | 7747-005-0745 | 7.40 ppb |
2016-11-14 | 7747-011-1105 | 15.5 ppb |
2016-11-14 | 7747-016-1400 | 8.90 ppb |
2016-11-14 | 7747-025-0800 | 10.6 ppb |
2016-11-14 | 7747-028-0920 | 9.20 ppb |
2016-11-14 | 7747-029-1230 | 15.7 ppb |
2016-11-14 | 7747-030-1335 | 15.5 ppb |
2016-11-14 | 7747-032-1315 | 12.8 ppb |
2016-11-14 | 7747-034-0945 | 7.10 ppb |
2017-02-13 | 7747-004-1200 | 5.60 ppb |
2017-02-13 | 7747-005-1005 | 6.20 ppb |
2017-02-13 | 7747-011-0950 | 5.80 ppb |
2017-02-13 | 7747-016-0915 | 5.90 ppb |
2017-02-13 | 7747-025-0745 | 6.10 ppb |
2017-02-13 | 7747-028-0825 | 7.40 ppb |
2017-02-13 | 7747-029-0905 | 7.50 ppb |
2017-02-13 | 7747-030-0800 | 6.30 ppb |
2017-02-13 | 7747-032-1310 | 6.50 ppb |
2017-02-13 | 7747-034-1150 | 6.30 ppb |
2017-05-01 | 9590-005-0800 | 6.60 ppb |
2017-05-08 | 1610-004-1050 | 4.36 ppb |
2017-05-08 | 1610-005-0720 | 4.14 ppb |
2017-05-08 | 1610-011-1225 | 3.74 ppb |
2017-05-08 | 1610-016-1255 | 3.55 ppb |
2017-05-08 | 1610-025-1355 | 3.46 ppb |
2017-05-08 | 1610-028-1330 | 3.22 ppb |
2017-05-08 | 1610-029-1140 | 3.96 ppb |
2017-05-08 | 1610-030-0900 | 3.71 ppb |
2017-05-08 | 1610-032-0935 | 3.68 ppb |
2017-05-08 | 1610-034-0900 | 3.47 ppb |
2017-08-14 | 7747-004-1220 | 6.00 ppb |
2017-08-14 | 7747-005-0800 | 4.00 ppb |
2017-08-14 | 7747-011-1100 | 4.40 ppb |
2017-08-14 | 7747-016-1420 | 4.20 ppb |
2017-08-14 | 7747-025-1115 | 7.30 ppb |
2017-08-14 | 7747-028-1215 | 5.50 ppb |
2017-08-14 | 7747-029-1015 | 4.10 ppb |
2017-08-14 | 7747-030-0900 | 4.30 ppb |
2017-08-14 | 7747-032-0920 | 4.40 ppb |
2017-08-14 | 7747-034-0740 | 4.60 ppb |
2017-11-13 | 7747-004-1100 | 6.60 ppb |
2017-11-13 | 7747-005-0720 | 5.40 ppb |
2017-11-13 | 7747-011-1100 | 9.30 ppb |
2017-11-13 | 7747-016-1340 | 5.90 ppb |
2017-11-13 | 7747-025-0800 | 7.60 ppb |
2017-11-13 | 7747-028-0930 | 9.50 ppb |
2017-11-13 | 7747-029-1150 | 10.6 ppb |
2017-11-13 | 7747-030-0850 | 9.70 ppb |
2017-11-13 | 7747-032-0815 | 9.50 ppb |
2017-11-13 | 7747-034-0930 | 5.20 ppb |
2018-02-12 | 7747-004-1020 | 7.30 ppb |
2018-02-12 | 7747-005-0700 | 7.10 ppb |
2018-02-12 | 7747-011-1210 | 7.60 ppb |
2018-02-12 | 7747-016-1340 | 7.30 ppb |
2018-02-12 | 7747-025-0915 | 7.40 ppb |
2018-02-12 | 7747-028-1050 | 5.90 ppb |
2018-02-12 | 7747-029-1130 | 8.20 ppb |
2018-02-12 | 7747-030-0800 | 7.60 ppb |
2018-02-12 | 7747-032-0900 | 8.00 ppb |
2018-02-12 | 7747-034-0935 | 6.90 ppb |
2018-05-07 | 9590-005-0800 | 6.00 ppb |
2018-05-14 | 7747-004-1115 | 9.70 ppb |
2018-05-14 | 7747-005-0730 | 5.20 ppb |
2018-05-14 | 7747-011-1020 | 12.9 ppb |
2018-05-14 | 7747-016-1355 | 8.70 ppb |
2018-05-14 | 7747-025-1045 | 11.5 ppb |
2018-05-14 | 7747-028-0935 | 9.30 ppb |
2018-05-14 | 7747-029-0940 | 11.6 ppb |
2018-05-14 | 7747-030-0900 | 12.7 ppb |
2018-05-14 | 7747-032-1300 | 12.4 ppb |
2018-05-14 | 7747-034-0815 | 5.80 ppb |
2018-08-13 | 7747-004-1045 | 7.70 ppb |
2018-08-13 | 7747-005-0830 | 4.40 ppb |
2018-08-13 | 7747-011-1310 | 10.00 ppb |
2018-08-13 | 7747-016-1350 | 9.10 ppb |
2018-08-13 | 7747-025-0915 | 7.70 ppb |
2018-08-13 | 7747-028-1030 | 9.60 ppb |
2018-08-13 | 7747-029-1215 | 8.80 ppb |
2018-08-13 | 7747-030-0900 | 9.20 ppb |
2018-08-13 | 7747-032-0930 | 6.40 ppb |
2018-08-13 | 7747-034-1000 | 3.60 ppb |
2018-11-13 | 7747-004-1000 | 8.90 ppb |
2018-11-13 | 7747-005-0730 | 5.50 ppb |
2018-11-13 | 7747-011-1200 | 5.30 ppb |
2018-11-13 | 7747-016-1100 | 7.20 ppb |
2018-11-13 | 7747-025-0730 | 8.70 ppb |
2018-11-13 | 7747-028-0850 | 8.40 ppb |
2018-11-13 | 7747-029-1245 | 6.00 ppb |
2018-11-13 | 7747-030-0920 | 6.00 ppb |
2018-11-13 | 7747-032-1015 | 6.00 ppb |
2018-11-13 | 7747-034-1145 | 5.80 ppb |
2019-02-19 | 1644-004-1025 | 4.90 ppb |
2019-02-19 | 1644-016-1320 | 5.50 ppb |
2019-02-19 | 1644-025-0750 | 6.00 ppb |
2019-02-19 | 1644-028-1000 | 9.60 ppb |
2019-02-19 | 1644-029-0800 | 5.30 ppb |
2019-02-19 | 1644-030-0955 | 5.20 ppb |
2019-02-19 | 1644-032-0915 | 4.90 ppb |
2019-02-19 | 1644-034-0945 | 7.20 ppb |
2019-05-06 | 1644-005-0730 | 4.50 ppb |
2019-05-16 | 7747-004-1250 | 7.30 ppb |
2019-05-16 | 7747-005-0710 | 6.80 ppb |
2019-05-16 | 7747-011-1135 | 6.50 ppb |
2019-05-16 | 7747-016-1025 | 5.30 ppb |
2019-05-16 | 7747-025-1235 | 6.00 ppb |
2019-05-16 | 7747-028-1115 | 5.90 ppb |
2019-05-16 | 7747-029-1045 | 6.30 ppb |
2019-05-16 | 7747-030-0930 | 6.40 ppb |
2019-05-16 | 7747-032-0955 | 5.20 ppb |
2019-05-16 | 7747-034-0835 | 5.30 ppb |
2019-08-12 | 7747-004-1245 | 8.70 ppb |
2019-08-12 | 7747-016-1340 | 12.2 ppb |
2019-08-12 | 7747-025-1150 | 9.30 ppb |
2019-08-12 | 7747-028-1240 | 13.6 ppb |
2019-08-12 | 7747-029-0820 | 10.4 ppb |
2019-08-12 | 7747-030-0740 | 10.6 ppb |
2019-08-12 | 7747-032-1315 | 10.00 ppb |
2019-08-12 | 7747-034-1115 | 5.40 ppb |
2019-11-12 | 7747-004-1145 | 5.80 ppb |
2019-11-12 | 7747-016-1410 | 4.80 ppb |
2019-11-12 | 7747-025-0950 | 7.50 ppb |
2019-11-12 | 7747-028-1105 | 7.60 ppb |
2019-11-12 | 7747-029-0825 | 4.20 ppb |
2019-11-12 | 7747-030-0925 | 4.00 ppb |
2019-11-12 | 7747-032-1315 | 4.80 ppb |
2019-11-12 | 7747-034-0915 | 5.50 ppb |