Dibromochloromethane
Lacey Twp MUA
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.
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 | 0.431 ppb | 15 | 10 | ND - 0.940 ppb |
| 2015 | 0.446 ppb | 16 | 9 | ND - 1.10 ppb |
| 2016 | 0.965 ppb | 16 | 13 | ND - 2.49 ppb |
| 2017 | 1.43 ppb | 16 | 16 | 0.680 ppb - 3.07 ppb |
| 2018 | 1.29 ppb | 16 | 16 | 0.460 ppb - 3.67 ppb |
| 2019 | 0.999 ppb | 16 | 15 | ND - 2.44 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 |
|---|---|---|
| 2014-01-07 | P14-0044-01 | 0.500 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 | 0.500 ppb |
| 2014-04-08 | P14-0826-04 | 0.570 ppb |
| 2014-04-08 | P14-0826-01 | 0.770 ppb |
| 2014-07-08 | P14-2172-03 | 0.700 ppb |
| 2014-07-08 | P14-2172-04 | 0.520 ppb |
| 2014-07-08 | P14-2172-02 | 0.940 ppb |
| 2014-07-08 | P14-2172-01 | 0.860 ppb |
| 2014-10-06 | P14-3814-02 | ND |
| 2014-10-06 | P14-3814-03 | 0.550 ppb |
| 2014-10-06 | P14-3814-04 | 0.550 ppb |
| 2014-10-06 | P14-3814-01 | ND |
| 2015-01-05 | P15-0027-04 | 0.740 ppb |
| 2015-01-05 | P15-0027-02 | ND |
| 2015-01-05 | P15-0027-03 | ND |
| 2015-01-05 | P15-0027-01 | ND |
| 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 | 0.660 ppb |
| 2015-07-02 | P15-3057-01 | 0.510 ppb |
| 2015-07-02 | P15-3057-03 | ND |
| 2015-07-02 | P15-3057-02 | ND |
| 2015-07-02 | P15-3057-04 | 0.750 ppb |
| 2015-10-13 | P15-5502-02 | 0.940 ppb |
| 2015-10-13 | P15-5502-03 | 1.10 ppb |
| 2015-10-13 | P15-5502-04 | 0.770 ppb |
| 2015-10-13 | P15-5502-01 | 1.03 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 | 0.520 ppb |
| 2016-04-12 | P16-1575-04 | 0.580 ppb |
| 2016-04-12 | P16-1575-03 | 1.45 ppb |
| 2016-04-12 | P16-1575-02 | 0.810 ppb |
| 2016-04-12 | P16-1575-01 | 0.690 ppb |
| 2016-07-05 | P16-3512-04 | 0.930 ppb |
| 2016-07-05 | P16-3512-03 | 2.02 ppb |
| 2016-07-05 | P16-3512-02 | 1.83 ppb |
| 2016-07-05 | P16-3512-01 | 0.670 ppb |
| 2016-10-11 | P16-5872-01 | 1.41 ppb |
| 2016-10-11 | P16-5872-04 | 0.610 ppb |
| 2016-10-11 | P16-5872-02 | 1.43 ppb |
| 2016-10-11 | P16-5872-03 | 2.49 ppb |
| 2017-01-24 | P17-0319-01 | 0.680 ppb |
| 2017-01-24 | P17-0319-03 | 1.80 ppb |
| 2017-01-24 | P17-0319-04 | 2.59 ppb |
| 2017-01-24 | P17-0319-02 | 0.680 ppb |
| 2017-04-25 | P17-1836-04 | 0.930 ppb |
| 2017-04-25 | P17-1836-03 | 2.13 ppb |
| 2017-04-25 | P17-1836-02 | 1.01 ppb |
| 2017-04-25 | P17-1836-01 | 0.920 ppb |
| 2017-07-25 | P17-4224-04 | 1.15 ppb |
| 2017-07-25 | P17-4224-01 | 0.950 ppb |
| 2017-07-25 | P17-4224-03 | 1.74 ppb |
| 2017-07-25 | P17-4224-02 | 1.10 ppb |
| 2017-10-24 | P17-6299-04 | 3.07 ppb |
| 2017-10-24 | P17-6299-01 | 1.17 ppb |
| 2017-10-24 | P17-6299-03 | 2.10 ppb |
| 2017-10-24 | P17-6299-02 | 0.860 ppb |
| 2018-01-23 | P18-0280-04 | 0.710 ppb |
| 2018-01-23 | P18-0280-01 | 0.600 ppb |
| 2018-01-23 | P18-0280-03 | 3.67 ppb |
| 2018-01-23 | P18-0280-02 | 0.460 ppb |
| 2018-04-24 | P18-1693-01 | 0.790 ppb |
| 2018-04-24 | P18-1693-04 | 0.540 ppb |
| 2018-04-24 | P18-1693-02 | 0.770 ppb |
| 2018-04-24 | P18-1693-03 | 1.39 ppb |
| 2018-07-31 | P18-5278-01 | 1.13 ppb |
| 2018-07-31 | P18-5278-04 | 1.24 ppb |
| 2018-07-31 | P18-5278-03 | 2.31 ppb |
| 2018-07-31 | P18-5278-02 | 1.33 ppb |
| 2018-10-09 | P18-7567-03 | 1.19 ppb |
| 2018-10-09 | P18-7567-04 | 2.78 ppb |
| 2018-10-09 | P18-7567-01 | 0.840 ppb |
| 2018-10-09 | P18-7567-02 | 0.840 ppb |
| 2019-01-15 | P19-0244-01 | 0.530 ppb |
| 2019-01-15 | P19-0244-02 | 0.560 ppb |
| 2019-01-15 | P19-0244-03 | 0.840 ppb |
| 2019-01-15 | P19-0244-04 | 1.64 ppb |
| 2019-04-09 | P19-2225-02 | 0.740 ppb |
| 2019-04-09 | P19-2225-03 | 1.17 ppb |
| 2019-04-09 | P19-2225-04 | 1.01 ppb |
| 2019-04-09 | P19-2225-01 | 0.790 ppb |
| 2019-07-23 | P19-6667-01 | 0.990 ppb |
| 2019-07-23 | P19-6667-02 | 0.660 ppb |
| 2019-07-23 | P19-6667-04 | 2.44 ppb |
| 2019-07-23 | P19-6667-03 | 1.46 ppb |
| 2019-10-08 | P19-9845-02 | ND |
| 2019-10-08 | P19-9845-04 | 1.49 ppb |
| 2019-10-08 | P19-9845-03 | 1.15 ppb |
| 2019-10-08 | P19-9845-01 | 0.510 ppb |