Dibromochloromethane
Bluewell Psd
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 | 0.625 ppb | 8 | 7 | ND - 1.11 ppb |
| 2015 | 0.761 ppb | 8 | 8 | 0.310 ppb - 1.27 ppb |
| 2016 | 0.330 ppb | 7 | 6 | ND - 0.550 ppb |
| 2017 | 0.151 ppb | 8 | 2 | ND - 0.680 ppb |
| 2018 | 0.673 ppb | 8 | 8 | 0.320 ppb - 1.17 ppb |
| 2019 | 0.0375 ppb | 8 | 1 | ND - 0.300 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 |
|---|---|---|
| 2014-02-18 | S2DBP_1402K08-02 | ND |
| 2014-02-18 | S2DBP_1402K08-01 | 0.290 ppb |
| 2014-05-14 | S2DBP_1405H70-02 | 0.370 ppb |
| 2014-05-14 | S2DBP_1405H70-01 | 0.510 ppb |
| 2014-08-11 | S2DBP_1408B95-02 | 0.960 ppb |
| 2014-08-11 | S2DBP_1408B95-01 | 0.840 ppb |
| 2014-11-18 | S2DBP_1411N45-02 | 1.11 ppb |
| 2014-11-18 | S2DBP_1411N45-01 | 0.920 ppb |
| 2015-02-11 | S2THM_1502C39-02 | 1.14 ppb |
| 2015-02-11 | S2THM_1502C39-01 | 0.930 ppb |
| 2015-05-04 | S2THM_1505324-01 | 0.320 ppb |
| 2015-05-04 | S2THM_1505324-03 | 0.310 ppb |
| 2015-08-19 | S2DBP_1508N19-02 | 1.27 ppb |
| 2015-08-19 | S2DBP_1508N19-01 | 0.720 ppb |
| 2015-11-12 | 1511G73-030 | 0.800 ppb |
| 2015-11-12 | 1511G73-01A | 0.600 ppb |
| 2016-02-10 | 1602O22-01A | 0.270 ppb |
| 2016-02-10 | 1602D22-02A | 0.290 ppb |
| 2016-02-10 | 1602D22-01A | 0.270 ppb |
| 2016-05-19 | 16052407-02A | 0.440 ppb |
| 2016-05-19 | 16052407-01A | ND |
| 2016-08-07 | 16081762-01A | 0.490 ppb |
| 2016-08-09 | 16081762-02A | 0.550 ppb |
| 2017-02-22 | 17022603-02A | ND |
| 2017-02-22 | 17022603-01A | ND |
| 2017-05-23 | 17053078-02A | ND |
| 2017-05-24 | 17053078-01A | ND |
| 2017-08-22 | 17083271-01A | ND |
| 2017-08-23 | 17083271-02A | ND |
| 2017-11-28 | 17113479-02A | 0.680 ppb |
| 2017-11-29 | 17113479-01A | 0.530 ppb |
| 2018-02-21 | 18022643-02A | 1.17 ppb |
| 2018-02-21 | 18022643-01A | 1.03 ppb |
| 2018-05-29 | 18053807-01A | 0.320 ppb |
| 2018-05-29 | 18053807-02A | 0.340 ppb |
| 2018-08-22 | 18083177-01A | 0.640 ppb |
| 2018-08-31 | 18090062-01A | 0.960 ppb |
| 2018-11-13 | 18111802-02A | 0.540 ppb |
| 2018-11-13 | 18111802-01A | 0.380 ppb |
| 2019-02-13 | 19021847-02A | ND |
| 2019-02-13 | 19021847-01A | ND |
| 2019-05-14 | 19051974-02A | ND |
| 2019-05-14 | 19051974-01A | ND |
| 2019-08-21 | 35492903002 | ND |
| 2019-08-21 | 35492903001 | ND |
| 2019-11-14 | 738387001 | 0.300 ppb |
| 2019-11-14 | 738387002 | ND |