Dibromochloromethane
Antioch
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.745 ppb | 12 | 8 | ND - 1.96 ppb |
2015 | 2.51 ppb | 2 | 1 | ND - 5.02 ppb |
2016 | 0.260 ppb | 2 | 1 | ND - 0.520 ppb |
2017 | 0.263 ppb | 2 | 1 | ND - 0.525 ppb |
2018 | 1.67 ppb | 2 | 2 | 1.35 ppb - 1.98 ppb |
2019 | 0.473 ppb | 2 | 1 | ND - 0.946 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 |
---|---|---|
2014-02-03 | 4020632-01 | 1.10 ppb |
2014-02-03 | 4020632-02 | 1.55 ppb |
2014-02-03 | 4020632-03 | 0.716 ppb |
2014-02-03 | 4020632-04 | ND |
2014-05-05 | 4051341-01 | 0.741 ppb |
2014-05-05 | 4051341-02 | 1.96 ppb |
2014-05-05 | 4051341-04 | ND |
2014-05-05 | 4051341-03 | 0.673 ppb |
2014-08-04 | 4081463-04 | ND |
2014-08-04 | 4081463-03 | 0.964 ppb |
2014-08-04 | 4081463-02 | 1.24 ppb |
2014-08-04 | 4081463-01 | ND |
2015-02-10 | 5021970-01 | 5.02 ppb |
2015-11-03 | 5111026-01 | ND |
2016-02-01 | 6020933-01 | 0.520 ppb |
2016-11-07 | 6111261-01 | ND |
2017-02-01 | 7020437-01 | 0.525 ppb |
2017-11-07 | 7111080-01 | ND |
2018-02-07 | 8021044-01 | 1.35 ppb |
2018-11-06 | 8110815-01 | 1.98 ppb |
2019-02-14 | 9022610-01 | 0.946 ppb |
2019-11-19 | 9113051-01 | ND |