Bromodichloromethane
Lacey Twp MUA
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.
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 | 0.513 ppb | 15 | 11 | ND - 1.03 ppb |
| 2015 | 0.654 ppb | 16 | 11 | ND - 1.41 ppb |
| 2016 | 1.08 ppb | 16 | 13 | ND - 2.81 ppb |
| 2017 | 1.39 ppb | 16 | 16 | 0.660 ppb - 3.45 ppb |
| 2018 | 1.36 ppb | 16 | 16 | 0.470 ppb - 3.83 ppb |
| 2019 | 1.09 ppb | 16 | 15 | ND - 2.49 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 |
|---|---|---|
| 2014-01-07 | P14-0044-01 | 0.550 ppb |
| 2014-01-07 | P14-0044-03 | ND |
| 2014-01-07 | P14-0044-04 | ND |
| 2014-01-07 | P14-0044-02 | ND |
| 2014-04-08 | P14-0826-03 | 0.540 ppb |
| 2014-04-08 | P14-0826-04 | 0.600 ppb |
| 2014-04-08 | P14-0826-01 | 0.920 ppb |
| 2014-07-08 | P14-2172-03 | 0.810 ppb |
| 2014-07-08 | P14-2172-04 | 0.570 ppb |
| 2014-07-08 | P14-2172-02 | 1.03 ppb |
| 2014-07-08 | P14-2172-01 | 0.880 ppb |
| 2014-10-06 | P14-3814-02 | ND |
| 2014-10-06 | P14-3814-03 | 0.610 ppb |
| 2014-10-06 | P14-3814-04 | 0.670 ppb |
| 2014-10-06 | P14-3814-01 | 0.520 ppb |
| 2015-01-05 | P15-0027-04 | 0.960 ppb |
| 2015-01-05 | P15-0027-02 | ND |
| 2015-01-05 | P15-0027-03 | ND |
| 2015-01-05 | P15-0027-01 | 0.570 ppb |
| 2015-04-01 | P15-1121-01 | 0.630 ppb |
| 2015-04-01 | P15-1121-03 | ND |
| 2015-04-01 | P15-1121-02 | ND |
| 2015-04-01 | P15-1121-04 | 0.680 ppb |
| 2015-07-02 | P15-3057-01 | 1.25 ppb |
| 2015-07-02 | P15-3057-03 | 0.760 ppb |
| 2015-07-02 | P15-3057-02 | ND |
| 2015-07-02 | P15-3057-04 | 1.41 ppb |
| 2015-10-13 | P15-5502-02 | 1.11 ppb |
| 2015-10-13 | P15-5502-03 | 1.06 ppb |
| 2015-10-13 | P15-5502-04 | 0.850 ppb |
| 2015-10-13 | P15-5502-01 | 1.19 ppb |
| 2016-01-26 | P16-0324-04 | ND |
| 2016-01-26 | P16-0324-03 | ND |
| 2016-01-26 | P16-0324-01 | ND |
| 2016-01-26 | P16-0324-02 | 0.570 ppb |
| 2016-04-12 | P16-1575-04 | 0.640 ppb |
| 2016-04-12 | P16-1575-03 | 1.60 ppb |
| 2016-04-12 | P16-1575-02 | 0.860 ppb |
| 2016-04-12 | P16-1575-01 | 0.750 ppb |
| 2016-07-05 | P16-3512-04 | 1.12 ppb |
| 2016-07-05 | P16-3512-03 | 2.25 ppb |
| 2016-07-05 | P16-3512-02 | 2.07 ppb |
| 2016-07-05 | P16-3512-01 | 0.780 ppb |
| 2016-10-11 | P16-5872-01 | 1.77 ppb |
| 2016-10-11 | P16-5872-04 | 0.810 ppb |
| 2016-10-11 | P16-5872-02 | 1.30 ppb |
| 2016-10-11 | P16-5872-03 | 2.81 ppb |
| 2017-01-24 | P17-0319-01 | 0.740 ppb |
| 2017-01-24 | P17-0319-03 | 1.95 ppb |
| 2017-01-24 | P17-0319-04 | 2.88 ppb |
| 2017-01-24 | P17-0319-02 | 0.730 ppb |
| 2017-04-25 | P17-1836-04 | 0.700 ppb |
| 2017-04-25 | P17-1836-03 | 2.24 ppb |
| 2017-04-25 | P17-1836-02 | 0.870 ppb |
| 2017-04-25 | P17-1836-01 | 0.720 ppb |
| 2017-07-25 | P17-4224-04 | 0.920 ppb |
| 2017-07-25 | P17-4224-01 | 0.660 ppb |
| 2017-07-25 | P17-4224-03 | 1.58 ppb |
| 2017-07-25 | P17-4224-02 | 0.690 ppb |
| 2017-10-24 | P17-6299-04 | 3.45 ppb |
| 2017-10-24 | P17-6299-01 | 1.33 ppb |
| 2017-10-24 | P17-6299-03 | 1.95 ppb |
| 2017-10-24 | P17-6299-02 | 0.900 ppb |
| 2018-01-23 | P18-0280-04 | 0.750 ppb |
| 2018-01-23 | P18-0280-01 | 0.590 ppb |
| 2018-01-23 | P18-0280-03 | 3.83 ppb |
| 2018-01-23 | P18-0280-02 | 0.510 ppb |
| 2018-04-24 | P18-1693-01 | 0.730 ppb |
| 2018-04-24 | P18-1693-04 | 0.470 ppb |
| 2018-04-24 | P18-1693-02 | 0.640 ppb |
| 2018-04-24 | P18-1693-03 | 1.46 ppb |
| 2018-07-31 | P18-5278-01 | 1.11 ppb |
| 2018-07-31 | P18-5278-04 | 1.25 ppb |
| 2018-07-31 | P18-5278-03 | 2.06 ppb |
| 2018-07-31 | P18-5278-02 | 1.27 ppb |
| 2018-10-09 | P18-7567-03 | 1.42 ppb |
| 2018-10-09 | P18-7567-04 | 3.57 ppb |
| 2018-10-09 | P18-7567-01 | 0.890 ppb |
| 2018-10-09 | P18-7567-02 | 1.13 ppb |
| 2019-01-15 | P19-0244-01 | 0.620 ppb |
| 2019-01-15 | P19-0244-02 | 0.570 ppb |
| 2019-01-15 | P19-0244-03 | 1.04 ppb |
| 2019-01-15 | P19-0244-04 | 2.02 ppb |
| 2019-04-09 | P19-2225-02 | 0.700 ppb |
| 2019-04-09 | P19-2225-03 | 1.24 ppb |
| 2019-04-09 | P19-2225-04 | 1.18 ppb |
| 2019-04-09 | P19-2225-01 | 0.850 ppb |
| 2019-07-23 | P19-6667-01 | 1.20 ppb |
| 2019-07-23 | P19-6667-02 | 0.700 ppb |
| 2019-07-23 | P19-6667-04 | 2.49 ppb |
| 2019-07-23 | P19-6667-03 | 1.53 ppb |
| 2019-10-08 | P19-9845-02 | ND |
| 2019-10-08 | P19-9845-04 | 1.76 ppb |
| 2019-10-08 | P19-9845-03 | 0.990 ppb |
| 2019-10-08 | P19-9845-01 | 0.560 ppb |