Dibromochloromethane
Pleasantville Water District
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 | 0.529 ppb | 9 | 9 | 0.420 ppb - 0.660 ppb |
| 2015 | 0.657 ppb | 8 | 8 | 0.310 ppb - 0.927 ppb |
| 2016 | 0.671 ppb | 8 | 8 | 0.520 ppb - 0.860 ppb |
| 2017 | 0.589 ppb | 8 | 8 | 0.410 ppb - 0.723 ppb |
| 2018 | 0.783 ppb | 8 | 8 | 0.480 ppb - 1.41 ppb |
| 2019 | 1.03 ppb | 8 | 8 | 0.733 ppb - 1.32 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 |
|---|---|---|
| 2014-02-14 | AQ02498 | 0.450 ppb |
| 2014-02-14 | AQ02497 | 0.420 ppb |
| 2014-05-14 | AQ08796 | 0.660 ppb |
| 2014-05-14 | AQ08795 | 0.470 ppb |
| 2014-08-15 | AQ16939 | 0.540 ppb |
| 2014-08-18 | AQ17073 | 0.520 ppb |
| 2014-11-14 | AQ23645 | 0.522 ppb |
| 2014-11-14 | AQ23644 | 0.604 ppb |
| 2014-12-23 | AQ26403DBP | 0.579 ppb |
| 2015-02-17 | AR03363DBP | 0.410 ppb |
| 2015-02-17 | AR03364DBP | 0.310 ppb |
| 2015-05-18 | AR10134DBP | 0.564 ppb |
| 2015-05-18 | AR10135DBP | 0.539 ppb |
| 2015-08-17 | AR17770 | 0.927 ppb |
| 2015-08-17 | AR17769 | 0.804 ppb |
| 2015-11-16 | AR24583 | 0.889 ppb |
| 2015-11-16 | AR24582DBP | 0.816 ppb |
| 2016-02-16 | AS03091DBP2 | 0.520 ppb |
| 2016-02-16 | AS03092DBP2 | 0.520 ppb |
| 2016-05-11 | AS09736DBP2 | 0.650 ppb |
| 2016-05-11 | AS09737DBP2 | 0.860 ppb |
| 2016-08-11 | AS17305 | 0.710 ppb |
| 2016-08-11 | AS17304 | 0.830 ppb |
| 2016-11-09 | AS23827 | 0.610 ppb |
| 2016-11-09 | AS23828 | 0.668 ppb |
| 2017-02-07 | AT02472 | 0.600 ppb |
| 2017-02-07 | AT02473 | 0.560 ppb |
| 2017-05-15 | AT09514 | 0.720 ppb |
| 2017-05-15 | AT09513 | 0.570 ppb |
| 2017-08-11 | AT16897 | 0.526 ppb |
| 2017-08-11 | AT16896 | 0.410 ppb |
| 2017-11-15 | AT24013 | 0.606 ppb |
| 2017-11-15 | AT24012 | 0.723 ppb |
| 2018-02-08 | AU02738DBP2 | 0.593 ppb |
| 2018-02-08 | AU02739DBP2 | 0.726 ppb |
| 2018-05-08 | AU09414DBP2 | 0.660 ppb |
| 2018-05-08 | AU09415DBP2 | 0.480 ppb |
| 2018-08-16 | AU17712DBP2 | 0.595 ppb |
| 2018-08-16 | AU17711DBP2 | 0.643 ppb |
| 2018-11-08 | AU24223-DBP2 | 1.41 ppb |
| 2018-11-08 | AU24224-DBP2 | 1.16 ppb |
| 2019-02-12 | AV03000DBP2 | 1.000 ppb |
| 2019-02-12 | AV02999DBP2 | 0.733 ppb |
| 2019-05-08 | AV09340DBP2 | 1.000 ppb |
| 2019-05-08 | AV09341DBP2 | 0.817 ppb |
| 2019-08-12 | AV17144-DBP2 | 1.32 ppb |
| 2019-08-12 | AV17143-DBP2 | 1.23 ppb |
| 2019-11-08 | AV23656-DBP2 | 1.01 ppb |
| 2019-11-08 | AV23655-DBP2 | 1.13 ppb |