Bromodichloromethane
Carlsbad Municipal Water System
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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 | 4 | 0 | ND |
| 2015 | 0.325 ppb | 16 | 7 | ND - 1.54 ppb |
| 2016 | 0.350 ppb | 16 | 7 | ND - 1.24 ppb |
| 2017 | 0.583 ppb | 16 | 7 | ND - 3.08 ppb |
| 2018 | 0.479 ppb | 16 | 7 | ND - 2.40 ppb |
| 2019 | 0.256 ppb | 2 | 1 | ND - 0.512 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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 |
|---|---|---|
| 2014-03-25 | 1403C47-001A | ND |
| 2014-03-25 | 1403A58-001A | ND |
| 2014-03-25 | 1403C46-001A | ND |
| 2014-03-25 | 1403C48-001A | ND |
| 2015-03-11 | 1503531-001A | ND |
| 2015-03-11 | 1503529-001A | ND |
| 2015-03-11 | 1503530-001A | ND |
| 2015-03-11 | 1503533-001A | ND |
| 2015-06-17 | 2015017905 | 0.520 ppb |
| 2015-06-17 | 2015017899 | 0.260 ppb |
| 2015-06-17 | 2015017901 | 0.410 ppb |
| 2015-06-17 | 2015017900 | 0.620 ppb |
| 2015-09-22 | 1509D84-001A | ND |
| 2015-09-22 | 1509D82-001A | ND |
| 2015-09-22 | 1509D79-001A | ND |
| 2015-09-22 | 1509D87-001A | ND |
| 2015-12-09 | 1512613-001A | 0.994 ppb |
| 2015-12-09 | 1512610-001A | ND |
| 2015-12-09 | 1512612-001A | 0.860 ppb |
| 2015-12-09 | 1512611-001A | 1.54 ppb |
| 2016-03-09 | 1603734-001A | 0.659 ppb |
| 2016-03-09 | 1603738-001A | ND |
| 2016-03-09 | 1603737-001A | ND |
| 2016-03-09 | 1603728-001A | ND |
| 2016-06-08 | 1606482-001A | 0.549 ppb |
| 2016-06-08 | 1606478-001A | ND |
| 2016-06-08 | 1606483-001A | ND |
| 2016-06-08 | 1606476-001A | ND |
| 2016-09-26 | 1609G45-001 | 1.24 ppb |
| 2016-09-26 | 1609F29-001A | 1.17 ppb |
| 2016-09-26 | 1609G44-001A | 0.664 ppb |
| 2016-09-26 | 1609G46-001 | ND |
| 2016-12-14 | 1612A73-001 | ND |
| 2016-12-14 | 1612A67-001 | ND |
| 2016-12-14 | 1612A69-001 | 0.812 ppb |
| 2016-12-14 | 1612A71-001 | 0.509 ppb |
| 2017-03-29 | 1703F05-001 | 0.505 ppb |
| 2017-03-29 | 1703F15-001 | ND |
| 2017-03-29 | 1703F16-001 | ND |
| 2017-03-29 | 1703F07-001 | ND |
| 2017-06-20 | 1706B39-001 | 2.32 ppb |
| 2017-06-20 | 1706B38-001 | ND |
| 2017-06-20 | 1706B32-001 | ND |
| 2017-06-20 | 1706B84-001 | ND |
| 2017-09-20 | 1709D26-001 | 0.564 ppb |
| 2017-09-20 | 1709D28-001 | ND |
| 2017-09-20 | 1709D27-001 | ND |
| 2017-09-20 | 1709D25-001 | 3.08 ppb |
| 2017-12-18 | 1712B71-001 | 1.41 ppb |
| 2017-12-18 | 1712B73-001 | 0.935 ppb |
| 2017-12-18 | 1712B75-001 | 0.511 ppb |
| 2017-12-18 | 1712B69-001 | ND |
| 2018-03-14 | 1803995-001 | ND |
| 2018-03-14 | 1803994-001 | 0.627 ppb |
| 2018-03-14 | 1803993-001 | 0.887 ppb |
| 2018-03-14 | 1803992-001 | 0.556 ppb |
| 2018-06-28 | 1806H84-001 | 2.17 ppb |
| 2018-06-28 | 1806H86-001 | ND |
| 2018-06-28 | 1806H89-001 | ND |
| 2018-06-28 | 1806H91-001 | ND |
| 2018-09-18 | 1809B32-001 | 2.40 ppb |
| 2018-09-18 | 1809B33-001 | ND |
| 2018-09-18 | 1809B34-001 | ND |
| 2018-09-18 | 1809B35-001 | ND |
| 2018-12-19 | 1812B88-001 | 0.508 ppb |
| 2018-12-19 | 1812B90-001 | ND |
| 2018-12-19 | 1812B85-001 | ND |
| 2018-12-19 | 1812B83-001 | 0.519 ppb |
| 2019-06-18 | 1906A44-001 | ND |
| 2019-09-10 | 1909788-001 | 0.512 ppb |