Dibromochloromethane
Monticello Water Department
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.0135 ppb | 24 | 7 | ND - 0.105 ppb |
| 2015 | 0.0400 ppb | 6 | 1 | ND - 0.240 ppb |
| 2016 | 0.0846 ppb | 12 | 4 | ND - 0.910 ppb |
| 2017 | 0.0250 ppb | 14 | 4 | ND - 0.135 ppb |
| 2018 | ND | 5 | 0 | ND |
| 2019 | 0.676 ppb | 13 | 3 | ND - 4.07 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 |
|---|---|---|
| 2014-02-17 | 14051004402 | ND |
| 2014-02-17 | 14051004302 | ND |
| 2014-02-17 | 14051004202 | ND |
| 2014-02-17 | 14051004502 | ND |
| 2014-04-22 | 14113000901 | ND |
| 2014-05-20 | 14142002802 | ND |
| 2014-05-20 | 14142003002 | ND |
| 2014-05-20 | 14142002702 | ND |
| 2014-05-20 | 14142002902 | ND |
| 2014-07-14 | 14198008801 | ND |
| 2014-07-14 | 14198008603 | 0.00758 ppb |
| 2014-07-14 | 14198008703 | ND |
| 2014-08-20 | 14233011202 | ND |
| 2014-08-20 | 14233011302 | ND |
| 2014-08-20 | 14233011102 | ND |
| 2014-08-20 | 14233011402 | ND |
| 2014-09-30 | 14275001603 | 0.00337 ppb |
| 2014-09-30 | 14275001503 | 0.0144 ppb |
| 2014-11-03 | 14310002003 | 0.0834 ppb |
| 2014-11-03 | 14310001903 | 0.0180 ppb |
| 2014-11-03 | 14310002103 | 0.0933 ppb |
| 2014-11-03 | 14310002301 | ND |
| 2014-11-03 | 14310002203 | 0.105 ppb |
| 2014-11-19 | 14324007802 | ND |
| 2015-05-26 | 15148008001 | ND |
| 2015-07-22 | 15204000102 | ND |
| 2015-08-03 | 15218000309 | ND |
| 2015-08-03 | 15218000303 | 0.240 ppb |
| 2015-11-04 | 15309004101 | ND |
| 2015-12-01 | 15337001802 | ND |
| 2016-01-20 | 16025000601 | ND |
| 2016-01-20 | 16025000501 | ND |
| 2016-01-20 | 16025000401 | ND |
| 2016-01-20 | 16025000301 | ND |
| 2016-01-20 | 16025000203 | 0.0380 ppb |
| 2016-05-03 | 16126016403 | 0.00914 ppb |
| 2016-05-03 | 16126016309 | ND |
| 2016-05-03 | 16126016303 | 0.0583 ppb |
| 2016-07-27 | 16210002001 | ND |
| 2016-08-16 | 16230000802 | ND |
| 2016-11-08 | 16314002501 | 0.910 ppb |
| 2016-11-09 | 16314002602 | ND |
| 2017-05-30 | 17152006201 | ND |
| 2017-07-19 | 17201000902 | ND |
| 2017-07-31 | 17215005101 | ND |
| 2017-07-31 | 17215005502 | 0.135 ppb |
| 2017-07-31 | 17215005402 | 0.0630 ppb |
| 2017-07-31 | 17215005302 | ND |
| 2017-07-31 | 17215005202 | ND |
| 2017-10-18 | 17292006302 | ND |
| 2017-11-06 | 17312000201 | ND |
| 2017-11-06 | 17312000303 | 0.0169 ppb |
| 2017-11-06 | 17312001701 | ND |
| 2017-11-06 | 17312000503 | 0.135 ppb |
| 2017-11-06 | 17312000403 | ND |
| 2017-11-06 | 17312000603 | ND |
| 2018-05-08 | 18130005401 | ND |
| 2018-07-30 | 18214000402 | ND |
| 2018-08-27 | 18242002401 | ND |
| 2018-10-29 | 18305001102 | ND |
| 2018-10-30 | 18305001001 | ND |
| 2019-02-20 | 19052004001 | ND |
| 2019-02-20 | 19052003901 | ND |
| 2019-02-20 | 19052003701 | ND |
| 2019-02-20 | 19052003801 | ND |
| 2019-02-26 | 19059002403 | ND |
| 2019-04-30 | 19121003803 | ND |
| 2019-04-30 | 19121003808 | ND |
| 2019-04-30 | 19121003703 | ND |
| 2019-07-01 | 19184003601 | ND |
| 2019-09-16 | 19261001508 | 2.72 ppb |
| 2019-09-16 | 19261001503 | 4.07 ppb |
| 2019-10-28 | 19303001602 | 2.00 ppb |
| 2019-11-25 | 19330001501 | ND |