Bromodichloromethane
City of Great Falls
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 | 10.6 ppb | 34 | 34 | 6.80 ppb - 13.0 ppb |
2015 | 10.4 ppb | 33 | 33 | 7.30 ppb - 14.0 ppb |
2016 | 11.9 ppb | 33 | 33 | 8.50 ppb - 16.0 ppb |
2017 | 11.7 ppb | 33 | 33 | 7.20 ppb - 15.0 ppb |
2018 | 11.1 ppb | 35 | 34 | ND - 13.0 ppb |
2019 | 9.83 ppb | 44 | 44 | 5.20 ppb - 14.0 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 |
---|---|---|
2014-02-18 | B14021350-003A | 7.70 ppb |
2014-02-18 | B14021350-004A | 10.00 ppb |
2014-02-19 | B14021350-001A | 8.30 ppb |
2014-02-19 | B14021350-005A | 8.10 ppb |
2014-02-19 | B14021350-008A | 9.40 ppb |
2014-02-20 | B14021350-002A | 9.80 ppb |
2014-02-20 | B14021350-006A | 6.80 ppb |
2014-02-20 | B14021350-007A | 10.00 ppb |
2014-05-05 | B14050434-001C | 11.0 ppb |
2014-05-08 | B14050856-001A | 11.0 ppb |
2014-05-08 | B14050856-002A | 11.0 ppb |
2014-05-08 | B14050856-003A | 11.0 ppb |
2014-05-08 | B14050856-004A | 11.0 ppb |
2014-05-27 | B14052535-001A | 10.00 ppb |
2014-05-27 | B14052535-002A | 12.0 ppb |
2014-05-28 | B14052535-004A | 12.0 ppb |
2014-05-29 | B14052535-003A | 11.0 ppb |
2014-08-05 | B14080466-001C | 11.0 ppb |
2014-08-12 | B14081497-007A | 13.0 ppb |
2014-08-13 | B14081497-003A | 12.0 ppb |
2014-08-13 | B14081497-004A | 12.0 ppb |
2014-08-13 | B14081497-005A | 12.0 ppb |
2014-08-14 | B14081497-001A | 12.0 ppb |
2014-08-14 | B14081497-002A | 12.0 ppb |
2014-08-14 | B14081497-006A | 12.0 ppb |
2014-08-14 | B14081497-008A | 13.0 ppb |
2014-11-24 | B14111959-001A | 9.00 ppb |
2014-11-24 | B14111959-004A | 11.0 ppb |
2014-11-24 | B14111959-005A | 10.00 ppb |
2014-11-24 | B14111959-007A | 10.00 ppb |
2014-11-24 | B14111959-008A | 11.0 ppb |
2014-11-25 | B14111959-002A | 10.00 ppb |
2014-11-25 | B14111959-003A | 10.00 ppb |
2014-11-25 | B14111959-006A | 9.10 ppb |
2015-02-12 | B15021136-001A | 10.00 ppb |
2015-02-12 | B15021136-002A | 10.00 ppb |
2015-02-12 | B15021136-003A | 10.00 ppb |
2015-02-18 | B15021552-001A | 8.70 ppb |
2015-02-18 | B15021552-002A | 9.50 ppb |
2015-02-18 | B15021552-003A | 8.50 ppb |
2015-02-18 | B15021552-005A | 9.90 ppb |
2015-02-19 | B15021552-004A | 8.70 ppb |
2015-05-20 | B15051785-001A | 7.40 ppb |
2015-05-20 | B15051785-002A | 11.0 ppb |
2015-05-20 | B15051785-003A | 9.30 ppb |
2015-05-20 | B15051785-004A | 11.0 ppb |
2015-05-20 | B15051785-005A | 8.80 ppb |
2015-05-20 | B15051785-006A | 7.30 ppb |
2015-05-20 | B15051785-007A | 10.00 ppb |
2015-05-20 | B15051785-008A | 11.0 ppb |
2015-06-02 | B15060379-001B | 9.80 ppb |
2015-08-18 | B15081763-001A | 13.0 ppb |
2015-08-18 | B15081763-002A | 14.0 ppb |
2015-08-18 | B15081763-003A | 12.0 ppb |
2015-08-18 | B15081763-004A | 13.0 ppb |
2015-08-18 | B15081763-005A | 12.0 ppb |
2015-08-18 | B15081763-006A | 13.0 ppb |
2015-08-18 | B15081763-007A | 13.0 ppb |
2015-08-18 | B15081763-008A | 13.0 ppb |
2015-11-19 | B15111686-001A | 10.00 ppb |
2015-11-19 | B15111686-002A | 9.50 ppb |
2015-11-19 | B15111686-003A | 9.40 ppb |
2015-11-19 | B15111686-004A | 10.00 ppb |
2015-11-19 | B15111686-005A | 10.00 ppb |
2015-11-19 | B15111686-006A | 9.30 ppb |
2015-11-19 | B15111686-007A | 11.0 ppb |
2015-11-19 | B15111686-008A | 10.00 ppb |
2016-02-11 | B16021106-001A | 11.0 ppb |
2016-02-11 | B16021106-002A | 11.0 ppb |
2016-02-11 | B16021106-003A | 11.0 ppb |
2016-02-11 | B16021106-004A | 11.0 ppb |
2016-02-11 | B16021106-005A | 11.0 ppb |
2016-02-11 | B16021106-006A | 9.40 ppb |
2016-02-11 | B16021106-007A | 11.0 ppb |
2016-02-11 | B16021106-008A | 12.0 ppb |
2016-05-11 | B16051040-001A | 9.40 ppb |
2016-05-11 | B16051040-002A | 11.0 ppb |
2016-05-11 | B16051040-003A | 10.00 ppb |
2016-05-11 | B16051040-004A | 11.0 ppb |
2016-05-11 | B16051040-005A | 10.00 ppb |
2016-05-11 | B16051040-006A | 10.00 ppb |
2016-05-11 | B16051040-007A | 9.80 ppb |
2016-05-18 | B16051544-001A | 8.50 ppb |
2016-06-13 | B16061189-001A | 11.0 ppb |
2016-08-18 | B16081963-001A | 15.0 ppb |
2016-08-18 | B16081963-002A | 14.0 ppb |
2016-08-18 | B16081963-003A | 16.0 ppb |
2016-08-18 | B16081963-004A | 13.0 ppb |
2016-08-18 | B16081963-005A | 15.0 ppb |
2016-08-18 | B16081963-006A | 15.0 ppb |
2016-08-18 | B16081963-007A | 15.0 ppb |
2016-08-23 | B16082339-001A | 15.0 ppb |
2016-11-17 | B16111589-001A | 11.0 ppb |
2016-11-17 | B16111589-002A | 11.0 ppb |
2016-11-17 | B16111589-003A | 13.0 ppb |
2016-11-17 | B16111589-004A | 11.0 ppb |
2016-11-17 | B16111589-005A | 12.0 ppb |
2016-11-17 | B16111589-006A | 13.0 ppb |
2016-11-17 | B16111589-007A | 13.0 ppb |
2016-11-21 | B16111800-001A | 11.0 ppb |
2017-02-14 | B17020956-001A | 7.80 ppb |
2017-02-14 | B17020956-002A | 8.80 ppb |
2017-02-14 | B17020956-003A | 7.80 ppb |
2017-02-14 | B17020956-004A | 9.40 ppb |
2017-02-14 | B17020956-005A | 8.60 ppb |
2017-02-14 | B17020956-006A | 7.20 ppb |
2017-02-14 | B17020956-007A | 8.60 ppb |
2017-02-14 | B17020956-008A | 9.40 ppb |
2017-05-17 | B17051728-001A | 11.0 ppb |
2017-05-17 | B17051728-002A | 11.0 ppb |
2017-05-17 | B17051728-003A | 12.0 ppb |
2017-05-17 | B17051728-004A | 12.0 ppb |
2017-05-17 | B17051728-005A | 12.0 ppb |
2017-05-17 | B17051728-006A | 12.0 ppb |
2017-05-17 | B17051728-007A | 12.0 ppb |
2017-05-18 | B17051830-001A | 11.0 ppb |
2017-06-06 | B17060662-001A | 13.0 ppb |
2017-08-16 | B17082053-001A | 13.0 ppb |
2017-08-16 | B17082053-002A | 14.0 ppb |
2017-08-16 | B17082053-003A | 14.0 ppb |
2017-08-16 | B17082053-004A | 13.0 ppb |
2017-08-16 | B17082053-005A | 13.0 ppb |
2017-08-16 | B17082053-006A | 14.0 ppb |
2017-08-17 | B17082053-007A | 13.0 ppb |
2017-08-17 | B17082053-008A | 13.0 ppb |
2017-11-16 | B17111476-001A | 14.0 ppb |
2017-11-16 | B17111476-002A | 13.0 ppb |
2017-11-16 | B17111476-003A | 12.0 ppb |
2017-11-16 | B17111476-004A | 13.0 ppb |
2017-11-16 | B17111476-005A | 15.0 ppb |
2017-11-20 | B17111867-001A | 13.0 ppb |
2017-11-20 | B17111867-002A | 13.0 ppb |
2017-11-20 | B17111867-003A | 13.0 ppb |
2018-01-24 | B18011760-001F | 11.0 ppb |
2018-02-13 | B18021264-001A | 13.0 ppb |
2018-02-13 | B18021264-002A | 12.0 ppb |
2018-02-13 | B18021264-003A | 13.0 ppb |
2018-02-13 | B18021264-004A | 13.0 ppb |
2018-02-13 | B18021264-005A | 13.0 ppb |
2018-02-13 | B18021264-006A | 13.0 ppb |
2018-02-15 | B18021264-007A | 13.0 ppb |
2018-02-15 | B18021264-008A | 12.0 ppb |
2018-05-18 | B18052149-002A | 12.0 ppb |
2018-05-18 | B18052149-007A | 13.0 ppb |
2018-05-18 | B18052149-008A | 13.0 ppb |
2018-05-21 | B18052149-001A | 11.0 ppb |
2018-05-21 | B18052149-003A | 12.0 ppb |
2018-05-21 | B18052149-004A | 12.0 ppb |
2018-05-21 | B18052149-005A | 12.0 ppb |
2018-05-21 | B18052149-006A | 11.0 ppb |
2018-08-15 | B18081851-001A | 9.90 ppb |
2018-08-15 | B18081851-002A | 12.0 ppb |
2018-08-15 | B18081851-003A | 10.00 ppb |
2018-08-15 | B18081851-004A | 10.00 ppb |
2018-08-15 | B18081851-006A | 10.00 ppb |
2018-08-15 | B18081851-007A | 12.0 ppb |
2018-08-15 | B18081851-008A | 11.0 ppb |
2018-08-16 | B18081851-005A | 11.0 ppb |
2018-11-01 | B18110214-001A | 11.0 ppb |
2018-11-01 | B18110214-002A | 9.60 ppb |
2018-11-19 | B18111832-001A | 11.0 ppb |
2018-11-19 | B18111832-003A | ND |
2018-11-19 | B18111832-004A | 10.00 ppb |
2018-11-19 | B18111832-006A | 9.20 ppb |
2018-11-19 | B18111832-008A | 11.0 ppb |
2018-11-20 | B18111832-002A | 9.70 ppb |
2018-11-20 | B18111832-005A | 9.80 ppb |
2018-11-20 | B18111832-007A | 11.0 ppb |
2019-01-30 | B19012302-001A | 7.10 ppb |
2019-02-11 | B19020678-001F | 8.10 ppb |
2019-02-12 | B19021080-001A | 10.00 ppb |
2019-02-12 | B19021080-002A | 11.0 ppb |
2019-02-12 | B19021080-006A | 9.20 ppb |
2019-02-12 | B19021080-007A | 12.0 ppb |
2019-02-13 | B19021080-003A | 11.0 ppb |
2019-02-13 | B19021080-004A | 11.0 ppb |
2019-02-13 | B19021080-005A | 10.00 ppb |
2019-02-13 | B19021080-008A | 11.0 ppb |
2019-02-13 | B19021081-001A | 6.40 ppb |
2019-03-25 | B19032203-001A | 5.20 ppb |
2019-03-27 | B19032376-001A | 9.10 ppb |
2019-03-28 | B19032376-002A | 9.70 ppb |
2019-03-28 | B19032376-003A | 8.50 ppb |
2019-03-28 | B19032376-004A | 10.00 ppb |
2019-03-28 | B19032376-005A | 8.30 ppb |
2019-03-28 | B19032376-006A | 7.20 ppb |
2019-03-28 | B19032376-007A | 9.70 ppb |
2019-03-28 | B19032376-008A | 11.0 ppb |
2019-05-21 | B19052229-001A | 8.20 ppb |
2019-05-21 | B19052229-004A | 11.0 ppb |
2019-05-21 | B19052229-006A | 8.50 ppb |
2019-05-21 | B19052229-008A | 10.00 ppb |
2019-05-22 | B19052229-002A | 10.00 ppb |
2019-05-22 | B19052229-003A | 9.40 ppb |
2019-05-22 | B19052229-005A | 8.80 ppb |
2019-05-22 | B19052229-007A | 8.90 ppb |
2019-08-21 | B19082305-001A | 11.0 ppb |
2019-08-21 | B19082305-004A | 12.0 ppb |
2019-08-21 | B19082305-005A | 12.0 ppb |
2019-08-21 | B19082305-006A | 12.0 ppb |
2019-08-22 | B19082305-002A | 12.0 ppb |
2019-08-22 | B19082305-003A | 13.0 ppb |
2019-08-22 | B19082305-007A | 12.0 ppb |
2019-08-22 | B19082305-008A | 14.0 ppb |
2019-11-19 | B19112018-001A | 9.70 ppb |
2019-11-19 | B19112018-002A | 9.90 ppb |
2019-11-19 | B19112018-004A | 9.80 ppb |
2019-11-19 | B19112018-006A | 8.30 ppb |
2019-11-19 | B19112018-007A | 9.30 ppb |
2019-11-19 | B19112018-008A | 9.10 ppb |
2019-11-20 | B19112018-003A | 9.60 ppb |
2019-11-20 | B19112018-005A | 8.60 ppb |