Dibromochloromethane
Pocantico Hills 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 | 0.375 ppb | 2 | 2 | 0.340 ppb - 0.410 ppb |
| 2015 | 0.355 ppb | 2 | 2 | 0.340 ppb - 0.370 ppb |
| 2016 | ND | 2 | 0 | ND |
| 2017 | 0.274 ppb | 8 | 6 | ND - 0.480 ppb |
| 2018 | 0.0838 ppb | 8 | 2 | ND - 0.340 ppb |
| 2019 | 0.366 ppb | 8 | 6 | ND - 0.740 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 |
|---|---|---|
| 2014-08-14 | AQ16861-DBP2 | 0.340 ppb |
| 2014-08-14 | AQ16860-DBP2 | 0.410 ppb |
| 2015-08-13 | AR17573-DBP2 | 0.370 ppb |
| 2015-08-13 | AR17574-DBP2 | 0.340 ppb |
| 2016-08-10 | AS17250-DBP2 | ND |
| 2016-08-10 | AS17251-DBP2 | ND |
| 2017-02-16 | AT03140-DBP2 | 0.280 ppb |
| 2017-02-16 | AT03141-DBP2 | 0.360 ppb |
| 2017-05-08 | AT08955-DBP2 | 0.360 ppb |
| 2017-05-08 | AT08956-DBP2 | 0.410 ppb |
| 2017-08-16 | AT17324-DBP2 | ND |
| 2017-08-16 | AT17323-DBP2 | 0.300 ppb |
| 2017-11-17 | AT24216DBP2 | 0.480 ppb |
| 2017-11-17 | AT24217DBP2 | ND |
| 2018-02-16 | AU03354DBP2 | ND |
| 2018-02-16 | AU03353DBP2 | ND |
| 2018-05-10 | AU09662-DBP2 | ND |
| 2018-05-10 | AU09661-DBP2 | ND |
| 2018-08-10 | AU17121-DBP2 | ND |
| 2018-08-10 | AU17120-DBP2 | ND |
| 2018-11-14 | AU24651-DBP2 | 0.330 ppb |
| 2018-11-14 | AU24652-DBP2 | 0.340 ppb |
| 2019-02-14 | AV03180-DBP2 | ND |
| 2019-02-14 | AV03179-DBP2 | ND |
| 2019-05-09 | AV09420-DBP2 | 0.260 ppb |
| 2019-05-09 | AV09421-DBP2 | 0.330 ppb |
| 2019-08-14 | AV17330-DBP2 | 0.740 ppb |
| 2019-08-14 | AV17329-DBP2 | 0.548 ppb |
| 2019-11-13 | AV23969-DBP2 | 0.490 ppb |
| 2019-11-13 | AV23970-DBP2 | 0.561 ppb |