Dibromochloromethane
Sw Boone County Water Association
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 | 0.784 ppb | 14 | 9 | ND - 1.63 ppb |
| 2015 | 0.499 ppb | 8 | 4 | ND - 1.63 ppb |
| 2016 | 0.283 ppb | 10 | 4 | ND - 0.890 ppb |
| 2017 | 0.123 ppb | 14 | 3 | ND - 0.795 ppb |
| 2018 | 0.146 ppb | 10 | 2 | ND - 0.950 ppb |
| 2019 | 0.157 ppb | 11 | 2 | ND - 1.12 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 |
|---|---|---|
| 2014-01-21 | 14023003601 | 0.660 ppb |
| 2014-02-17 | 14051007302 | ND |
| 2014-02-17 | 14051007102 | ND |
| 2014-04-29 | 14121003109 | 1.02 ppb |
| 2014-04-29 | 14121003103 | 1.13 ppb |
| 2014-04-29 | 14121005202 | ND |
| 2014-04-29 | 14121005302 | 1.20 ppb |
| 2014-07-28 | 14212001302 | ND |
| 2014-07-28 | 14212001602 | 1.10 ppb |
| 2014-08-19 | 14233003803 | 1.63 ppb |
| 2014-08-19 | 14233003809 | 1.26 ppb |
| 2014-10-28 | 14303008202 | ND |
| 2014-10-28 | 14303008502 | 1.50 ppb |
| 2014-10-28 | 14303006502 | 1.47 ppb |
| 2015-01-27 | 15029009302 | 0.850 ppb |
| 2015-04-28 | 15120005602 | 0.700 ppb |
| 2015-07-07 | 15190010602 | ND |
| 2015-07-07 | 15190009502 | ND |
| 2015-07-28 | 15210001001 | 1.63 ppb |
| 2015-10-28 | 15302004502 | ND |
| 2015-10-28 | 15302004401 | 0.810 ppb |
| 2015-10-28 | 15302004302 | ND |
| 2016-01-21 | 16025006901 | 0.850 ppb |
| 2016-05-17 | 16140011102 | 0.890 ppb |
| 2016-05-17 | 16140011302 | ND |
| 2016-05-17 | 16140011202 | ND |
| 2016-07-18 | 16203007401 | 0.530 ppb |
| 2016-08-23 | 16237000802 | ND |
| 2016-08-23 | 16237000702 | ND |
| 2016-11-15 | 16321009801 | 0.560 ppb |
| 2016-11-15 | 16321010002 | ND |
| 2016-11-15 | 16321009902 | ND |
| 2017-02-06 | 17040000701 | ND |
| 2017-02-06 | 17040000802 | ND |
| 2017-02-06 | 17040000902 | ND |
| 2017-04-25 | 17117003409 | ND |
| 2017-04-25 | 17117003602 | ND |
| 2017-04-25 | 17117003403 | 0.393 ppb |
| 2017-04-25 | 17117003502 | ND |
| 2017-07-25 | 17207001908 | 0.530 ppb |
| 2017-07-25 | 17207001802 | ND |
| 2017-07-25 | 17207001502 | ND |
| 2017-07-25 | 17207001903 | 0.795 ppb |
| 2017-10-24 | 17299004702 | ND |
| 2017-10-24 | 17299004802 | ND |
| 2017-10-25 | 17299005901 | ND |
| 2018-01-24 | 18025010402 | ND |
| 2018-05-08 | 18129001902 | ND |
| 2018-05-08 | 18129001802 | ND |
| 2018-05-08 | 18129001702 | 0.510 ppb |
| 2018-07-31 | 18213007402 | ND |
| 2018-07-31 | 18213007702 | ND |
| 2018-07-31 | 18213007301 | 0.950 ppb |
| 2018-10-30 | 18304001501 | ND |
| 2018-10-30 | 18304001602 | ND |
| 2018-10-30 | 18304001902 | ND |
| 2019-01-29 | 19031007702 | ND |
| 2019-01-29 | 19031007402 | ND |
| 2019-01-29 | 19031007301 | ND |
| 2019-04-30 | 19122005902 | ND |
| 2019-04-30 | 19122005602 | ND |
| 2019-04-30 | 19122005502 | 0.610 ppb |
| 2019-07-23 | 19205003401 | 1.12 ppb |
| 2019-07-30 | 19212006802 | ND |
| 2019-07-30 | 19212006502 | ND |
| 2019-10-30 | 19305001002 | ND |
| 2019-10-30 | 19305001102 | ND |