Dibromochloromethane
Viewland Subdivision
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 | 0.476 ppb | 5 | 5 | 0.310 ppb - 0.890 ppb |
| 2015 | 0.635 ppb | 4 | 4 | 0.270 ppb - 1.17 ppb |
| 2016 | 0.297 ppb | 3 | 2 | ND - 0.490 ppb |
| 2017 | 0.195 ppb | 4 | 2 | ND - 0.440 ppb |
| 2018 | 0.197 ppb | 3 | 1 | ND - 0.590 ppb |
| 2019 | 0.413 ppb | 5 | 3 | ND - 0.885 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 |
|---|---|---|
| 2014-01-28 | 1401O90-01A | 0.310 ppb |
| 2014-03-13 | 1403H60-02A | 0.890 ppb |
| 2014-06-12 | 1406H89-02A | 0.350 ppb |
| 2014-07-31 | 1408133-01A | 0.390 ppb |
| 2014-11-13 | 1411G65-01A | 0.440 ppb |
| 2015-03-31 | 00281-REI CONSUL | 0.570 ppb |
| 2015-06-12 | 00281-REI CONSUL | 1.17 ppb |
| 2015-09-10 | 00281-REI CONSUL | 0.530 ppb |
| 2015-12-10 | 00281-REI CONSUL | 0.270 ppb |
| 2016-03-29 | 16033322-02A | ND |
| 2016-06-20 | 16062512-01A | 0.400 ppb |
| 2016-10-27 | 16103192-01A | 0.490 ppb |
| 2017-03-16 | 17032262-01A | 0.440 ppb |
| 2017-06-16 | 17062383-01A | ND |
| 2017-09-15 | 17092132-01A | ND |
| 2017-12-12 | 17121971-01A | 0.340 ppb |
| 2018-03-16 | 18032735-01A | ND |
| 2018-06-14 | 18062146-01A | ND |
| 2018-09-13 | 18091715-01A | 0.590 ppb |
| 2019-03-14 | 19032057-01A | 0.500 ppb |
| 2019-06-10 | 19061372-01A | ND |
| 2019-09-12 | 19091748-01A | 0.885 ppb |
| 2019-09-12 | 19091748-03A | ND |
| 2019-12-12 | 7311606002 | 0.680 ppb |