Bromodichloromethane
City of Chicago
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 |
---|---|---|---|---|
2014 | 6.11 ppb | 32 | 32 | 3.50 ppb - 9.10 ppb |
2015 | 6.88 ppb | 32 | 32 | 4.60 ppb - 9.50 ppb |
2016 | 8.15 ppb | 32 | 32 | 4.20 ppb - 13.9 ppb |
2017 | 7.77 ppb | 32 | 32 | 5.40 ppb - 11.5 ppb |
2018 | 7.58 ppb | 32 | 32 | 4.50 ppb - 11.4 ppb |
2019 | 7.75 ppb | 32 | 32 | 4.70 ppb - 13.1 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 |
---|---|---|
2014-03-11 | SC40245-01_01 | 4.70 ppb |
2014-03-11 | SC40245-02_01 | 5.20 ppb |
2014-03-11 | SC40245-03_01 | 4.30 ppb |
2014-03-11 | SC40245-04_01 | 4.30 ppb |
2014-03-11 | SC40246-01_01 | 4.30 ppb |
2014-03-11 | SC40246-02_01 | 6.00 ppb |
2014-03-11 | SC40246-03_01 | 4.50 ppb |
2014-03-11 | SC40246-04_01 | 4.30 ppb |
2014-06-10 | SF40499-01_01 | 7.40 ppb |
2014-06-10 | SF40499-02_01 | 7.00 ppb |
2014-06-10 | SF40499-03_01 | 7.40 ppb |
2014-06-10 | SF40499-04_01 | 7.50 ppb |
2014-06-10 | SF40499-05_01 | 8.20 ppb |
2014-06-10 | SF40499-08_01 | 7.40 ppb |
2014-06-10 | SF40499-07_01 | 7.00 ppb |
2014-06-10 | SF40499-06_01 | 7.60 ppb |
2014-09-09 | SI40440-01_01 | 7.70 ppb |
2014-09-09 | SI40440-02_01 | 7.40 ppb |
2014-09-09 | SI40440-03_01 | 7.90 ppb |
2014-09-09 | SI40440-04_01 | 6.70 ppb |
2014-09-09 | SI40470-01_01 | 9.00 ppb |
2014-09-09 | SI40470-02_01 | 9.10 ppb |
2014-09-09 | SI40470-03_01 | 8.40 ppb |
2014-09-09 | SI40470-04_01 | 7.50 ppb |
2014-12-09 | SL40306-01_01 | 4.40 ppb |
2014-12-09 | SL40306-02_01 | 3.80 ppb |
2014-12-09 | SL40306-03_01 | 3.50 ppb |
2014-12-09 | SL40306-04_01 | 4.10 ppb |
2014-12-09 | SL40305-01_01 | 5.00 ppb |
2014-12-09 | SL40305-02_01 | 4.80 ppb |
2014-12-09 | SL40305-03_01 | 4.30 ppb |
2014-12-09 | SL40305-04_01 | 4.90 ppb |
2015-03-10 | SC50297-01_01 | 5.20 ppb |
2015-03-10 | SC50297-02_01 | 4.80 ppb |
2015-03-10 | SC50297-03_01 | 4.70 ppb |
2015-03-10 | SC50297-04_01 | 4.60 ppb |
2015-03-10 | SC50298-01_01 | 5.60 ppb |
2015-03-10 | SC50298-02_01 | 5.10 ppb |
2015-03-10 | SC50298-03_01 | 4.60 ppb |
2015-03-10 | SC50298-04_01 | 5.50 ppb |
2015-06-09 | SF50508-01_01 | 9.00 ppb |
2015-06-09 | SF50508-02_01 | 9.50 ppb |
2015-06-09 | SF50508-03_01 | 9.00 ppb |
2015-06-09 | SF50508-04_01 | 8.90 ppb |
2015-06-09 | SF50515-01_01 | 8.90 ppb |
2015-06-09 | SF50515-02_01 | 9.00 ppb |
2015-06-09 | SF50515-03_01 | 8.60 ppb |
2015-06-09 | SF50515-04_01 | 9.30 ppb |
2015-09-08 | SI50398-01_01 | 7.30 ppb |
2015-09-08 | SI50398-02_01 | 7.50 ppb |
2015-09-08 | SI50398-03_01 | 7.80 ppb |
2015-09-08 | SI50398-04_01 | 7.70 ppb |
2015-09-08 | SI50397-01_01 | 7.40 ppb |
2015-09-08 | SI50397-02_01 | 7.20 ppb |
2015-09-08 | SI50397-03_01 | 7.70 ppb |
2015-09-08 | SI50397-04_01 | 7.80 ppb |
2015-12-08 | SL50257-01_01 | 5.80 ppb |
2015-12-08 | SL50257-02_01 | 5.60 ppb |
2015-12-08 | SL50257-03_01 | 5.70 ppb |
2015-12-08 | SL50257-04_01 | 5.80 ppb |
2015-12-08 | SL50258-01_01 | 5.80 ppb |
2015-12-08 | SL50258-02_01 | 6.50 ppb |
2015-12-08 | SL50258-03_01 | 5.40 ppb |
2015-12-08 | SL50258-04_01 | 6.80 ppb |
2016-03-09 | 16C0300-01_01 | 8.20 ppb |
2016-03-09 | 16C0300-03_01 | 4.50 ppb |
2016-03-09 | 16C0300-04_01 | 5.00 ppb |
2016-03-09 | 16C0300-02_01 | 4.30 ppb |
2016-03-09 | 16C0297-01_01 | 5.30 ppb |
2016-03-09 | 16C0297-03_01 | 4.20 ppb |
2016-03-09 | 16C0297-04_01 | 5.70 ppb |
2016-03-09 | 16C0297-02_01 | 6.00 ppb |
2016-06-14 | 16F0674-01_01 | 8.10 ppb |
2016-06-14 | 16F0674-02_01 | 7.50 ppb |
2016-06-14 | 16F0674-03_01 | 7.30 ppb |
2016-06-14 | 16F0674-04_01 | 7.70 ppb |
2016-06-14 | 16F0672-01_01 | 8.70 ppb |
2016-06-14 | 16F0672-02_01 | 6.80 ppb |
2016-06-14 | 16F0672-03_01 | 8.80 ppb |
2016-06-14 | 16F0672-04_01 | 8.90 ppb |
2016-09-06 | 16I0160-01_01 | 12.3 ppb |
2016-09-06 | 16I0160-02_01 | 13.6 ppb |
2016-09-06 | 16I0160-03_01 | 13.7 ppb |
2016-09-06 | 16I0160-04_01 | 13.9 ppb |
2016-09-14 | 16I0569-01_01 | 11.3 ppb |
2016-09-14 | 16I0569-02_01 | 11.8 ppb |
2016-09-14 | 16I0569-03_01 | 10.8 ppb |
2016-09-14 | 16I0569-04_01 | 12.0 ppb |
2016-12-06 | 16L0160-01_01 | 6.30 ppb |
2016-12-06 | 16L0160-02_01 | 6.60 ppb |
2016-12-06 | 16L0160-03_01 | 6.20 ppb |
2016-12-06 | 16L0160-04_01 | 6.30 ppb |
2016-12-06 | 16L0163-01_01 | 7.20 ppb |
2016-12-06 | 16L0163-02_01 | 7.50 ppb |
2016-12-06 | 16L0163-03_01 | 6.60 ppb |
2016-12-06 | 16L0163-04_01 | 7.60 ppb |
2017-03-06 | 17C0264-01_01 | 6.10 ppb |
2017-03-06 | 17C0264-02_01 | 5.50 ppb |
2017-03-06 | 17C0264-03_01 | 5.40 ppb |
2017-03-06 | 17C0264-04_01 | 5.70 ppb |
2017-03-06 | 17C0264-05_01 | 6.20 ppb |
2017-03-06 | 17C0264-07_01 | 5.60 ppb |
2017-03-06 | 17C0264-06_01 | 5.60 ppb |
2017-03-06 | 17C0264-08_01 | 5.40 ppb |
2017-06-07 | 17F0351-01_01 | 8.80 ppb |
2017-06-07 | 17F0351-02_01 | 8.80 ppb |
2017-06-07 | 17F0351-03_01 | 8.00 ppb |
2017-06-07 | 17F0351-04_01 | 9.00 ppb |
2017-06-07 | 17F0351-05_01 | 9.80 ppb |
2017-06-07 | 17F0351-06_01 | 7.70 ppb |
2017-06-07 | 17F0351-07_01 | 8.60 ppb |
2017-06-07 | 17F0351-08_01 | 9.10 ppb |
2017-09-05 | 17I0082-01_01 | 11.0 ppb |
2017-09-05 | 17I0082-02_01 | 11.5 ppb |
2017-09-05 | 17I0082-03_01 | 10.7 ppb |
2017-09-05 | 17I0082-04_01 | 9.90 ppb |
2017-09-05 | 17I0081-01_01 | 10.4 ppb |
2017-09-05 | 17I0081-02_01 | 10.2 ppb |
2017-09-05 | 17I0081-03_01 | 10.4 ppb |
2017-09-05 | 17I0081-04_01 | 10.4 ppb |
2017-12-05 | 17L0095-01_01 | 5.80 ppb |
2017-12-05 | 17L0095-02_01 | 5.50 ppb |
2017-12-05 | 17L0095-03_01 | 7.20 ppb |
2017-12-05 | 17L0095-04_01 | 5.40 ppb |
2017-12-05 | 17L0092-01_01 | 6.40 ppb |
2017-12-05 | 17L0092-02_01 | 6.30 ppb |
2017-12-05 | 17L0092-03_01 | 5.80 ppb |
2017-12-05 | 17L0092-04_01 | 6.30 ppb |
2018-03-06 | 18C0152-01_01 | 4.50 ppb |
2018-03-06 | 18C0152-02_01 | 4.70 ppb |
2018-03-06 | 18C0152-03_01 | 4.60 ppb |
2018-03-06 | 18C0152-04_01 | 4.70 ppb |
2018-03-06 | 18C0154-01_01 | 5.50 ppb |
2018-03-06 | 18C0154-02_01 | 5.10 ppb |
2018-03-06 | 18C0154-03_01 | 5.00 ppb |
2018-03-06 | 18C0154-04_01 | 6.00 ppb |
2018-06-05 | 18F0175-01 | 9.90 ppb |
2018-06-05 | 18F0175-02 | 9.80 ppb |
2018-06-05 | 18F0175-03 | 10.3 ppb |
2018-06-05 | 18F0175-04 | 9.70 ppb |
2018-06-05 | 18F0250-01 | 9.40 ppb |
2018-06-05 | 18F0250-02 | 9.30 ppb |
2018-06-05 | 18F0250-03 | 9.70 ppb |
2018-06-05 | 18F0250-04 | 11.4 ppb |
2018-09-13 | 18I0524-01_01 | 10.00 ppb |
2018-09-13 | 18I0524-02_01 | 9.10 ppb |
2018-09-13 | 18I0524-03_01 | 8.80 ppb |
2018-09-13 | 18I0524-04_01 | 11.2 ppb |
2018-09-13 | 18I0526-01_01 | 10.2 ppb |
2018-09-13 | 18I0526-02_01 | 9.80 ppb |
2018-09-13 | 18I0526-03_01 | 9.30 ppb |
2018-09-13 | 18I0526-04_01 | 10.1 ppb |
2018-12-19 | 18L0475-01_01 | 5.40 ppb |
2018-12-19 | 18L0475-02_01 | 4.90 ppb |
2018-12-19 | 18L0475-03_01 | 4.70 ppb |
2018-12-19 | 18L0475-04_01 | 6.40 ppb |
2018-12-19 | 18L0476-01_01 | 6.80 ppb |
2018-12-19 | 18L0476-02_01 | 5.00 ppb |
2018-12-19 | 18L0476-03_01 | 4.80 ppb |
2018-12-19 | 18L0476-04_01 | 6.30 ppb |
2019-03-20 | 19C0410-01 | 6.50 ppb |
2019-03-20 | 19C0410-02 | 5.80 ppb |
2019-03-20 | 19C0410-03 | 5.40 ppb |
2019-03-20 | 19C0410-04 | 7.70 ppb |
2019-03-20 | 19C0411-01 | 6.00 ppb |
2019-03-20 | 19C0411-02 | 5.60 ppb |
2019-03-20 | 19C0411-03 | 5.10 ppb |
2019-03-20 | 19C0411-04 | 6.40 ppb |
2019-06-12 | 19F0377-01 | 9.00 ppb |
2019-06-12 | 19F0377-02 | 8.80 ppb |
2019-06-12 | 19F0377-03 | 8.70 ppb |
2019-06-12 | 19F0377-04 | 9.40 ppb |
2019-06-12 | 19F0377-05 | 9.00 ppb |
2019-06-12 | 19F0377-06 | 9.20 ppb |
2019-06-12 | 19F0377-07 | 8.50 ppb |
2019-06-12 | 19F0377-08 | 9.30 ppb |
2019-09-11 | 19I0437-01 | 9.70 ppb |
2019-09-11 | 19I0437-02 | 10.4 ppb |
2019-09-11 | 19I0438-01 | 9.30 ppb |
2019-09-11 | 19I0438-02 | 13.1 ppb |
2019-09-11 | 19I0491-01 | 10.2 ppb |
2019-09-11 | 19I0491-02 | 11.2 ppb |
2019-09-11 | 19I0492-01 | 10.7 ppb |
2019-09-11 | 19I0494-01 | 10.7 ppb |
2019-12-23 | 19L0504-01 | 5.30 ppb |
2019-12-23 | 19L0504-02 | 4.90 ppb |
2019-12-23 | 19L0504-03 | 4.70 ppb |
2019-12-23 | 19L0504-04 | 5.80 ppb |
2019-12-23 | 19L0505-01 | 5.50 ppb |
2019-12-23 | 19L0505-02 | 5.40 ppb |
2019-12-23 | 19L0505-03 | 5.70 ppb |
2019-12-23 | 19L0505-04 | 5.00 ppb |