Dibromochloromethane
Bloomfield Water Supply System
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 | ND | 5 | 0 | ND |
| 2015 | 0.877 ppb | 8 | 6 | ND - 1.50 ppb |
| 2016 | 0.703 ppb | 8 | 7 | ND - 1.13 ppb |
| 2017 | 0.713 ppb | 8 | 8 | 0.562 ppb - 1.02 ppb |
| 2018 | 0.607 ppb | 8 | 7 | ND - 1.11 ppb |
| 2019 | 1.00 ppb | 8 | 8 | 0.556 ppb - 1.60 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 | 1402193-001A | ND |
| 2014-05-05 | 1405316-001A | ND |
| 2014-08-04 | 1408249-001A | ND |
| 2014-11-12 | 1411668-001A | ND |
| 2014-11-12 | 1411669-001A | ND |
| 2015-02-04 | 1502374-001A | ND |
| 2015-02-04 | 1502376-001A | ND |
| 2015-05-04 | 1505241-001A | 1.20 ppb |
| 2015-05-04 | 1505242-001A | 0.965 ppb |
| 2015-08-04 | 2015023003 | 1.50 ppb |
| 2015-08-04 | 2015023002 | 1.30 ppb |
| 2015-11-03 | 1511117-001A | 0.910 ppb |
| 2015-11-03 | 1511116-001A | 1.14 ppb |
| 2016-02-02 | 1602158-001A | 0.701 ppb |
| 2016-02-03 | 1602159-001A | 0.583 ppb |
| 2016-05-03 | 1605133-001A | 1.06 ppb |
| 2016-05-03 | 1605132-001A | 0.786 ppb |
| 2016-08-02 | 1608227-001A | 1.13 ppb |
| 2016-08-02 | 1608230-001A | 0.666 ppb |
| 2016-11-02 | 1611275-001 | 0.694 ppb |
| 2016-11-02 | 1611274-001 | ND |
| 2017-02-08 | 1702570-001 | 0.576 ppb |
| 2017-02-08 | 1702569-001 | 0.679 ppb |
| 2017-05-02 | 1705357-001 | 1.02 ppb |
| 2017-05-02 | 1705359-001 | 0.837 ppb |
| 2017-08-08 | 1708740-001 | 0.655 ppb |
| 2017-08-08 | 1708742-001 | 0.562 ppb |
| 2017-11-01 | 1711161-001 | 0.760 ppb |
| 2017-11-01 | 1711160-001 | 0.612 ppb |
| 2018-02-01 | 1802156-001 | 0.505 ppb |
| 2018-02-01 | 1802154-001 | ND |
| 2018-05-08 | 1805476-001 | 0.765 ppb |
| 2018-05-08 | 1805477-001 | 0.560 ppb |
| 2018-08-07 | 1808558-001 | 1.11 ppb |
| 2018-08-07 | 1808562-001 | 0.654 ppb |
| 2018-11-27 | 1811C95-001 | 0.679 ppb |
| 2018-11-27 | 1811C97-001 | 0.580 ppb |
| 2019-02-06 | 1902394-001 | 0.740 ppb |
| 2019-02-06 | 1902409-001 | 0.616 ppb |
| 2019-05-08 | 1905555-001 | 1.50 ppb |
| 2019-05-28 | 1905D74-001 | 1.02 ppb |
| 2019-08-14 | 1908A35-001 | 1.20 ppb |
| 2019-08-14 | 1908A37-001 | 1.60 ppb |
| 2019-11-06 | 1911408-001 | 0.556 ppb |
| 2019-11-06 | 1911407-001 | 0.780 ppb |