Dibromochloromethane
Ho Ho Kus 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 |
|---|---|---|---|---|
| 2014 | 0.366 ppb | 16 | 10 | ND - 0.985 ppb |
| 2015 | 0.953 ppb | 16 | 16 | 0.263 ppb - 5.47 ppb |
| 2016 | 1.24 ppb | 14 | 14 | 0.316 ppb - 7.11 ppb |
| 2017 | 1.13 ppb | 9 | 9 | 0.260 ppb - 5.10 ppb |
| 2018 | 1.73 ppb | 11 | 11 | 0.491 ppb - 6.22 ppb |
| 2019 | 2.20 ppb | 5 | 5 | 0.646 ppb - 5.90 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 |
|---|---|---|
| 2014-03-05 | 4030124-09 | ND |
| 2014-03-05 | 4030124-06 | ND |
| 2014-03-05 | 4030124-07 | ND |
| 2014-03-05 | 4030124-08 | ND |
| 2014-05-13 | 4050425-06 | 0.510 ppb |
| 2014-05-13 | 4050425-08 | ND |
| 2014-05-13 | 4050425-09 | 0.560 ppb |
| 2014-05-13 | 4050425-07 | 0.960 ppb |
| 2014-08-26 | 4080821-04 | 0.260 ppb |
| 2014-08-26 | 4080821-03 | 0.560 ppb |
| 2014-08-26 | 4080821-01 | 0.340 ppb |
| 2014-08-26 | 4080821-02 | 0.450 ppb |
| 2014-12-03 | 4120165-04 | 0.387 ppb |
| 2014-12-03 | 4120165-03 | 0.836 ppb |
| 2014-12-03 | 4120165-01 | ND |
| 2014-12-03 | 4120165-02 | 0.985 ppb |
| 2015-02-11 | 5020292-14 | 0.816 ppb |
| 2015-02-11 | 5020292-12 | 1.93 ppb |
| 2015-02-11 | 5020292-13 | 0.593 ppb |
| 2015-05-26 | 5050692-03 | 0.692 ppb |
| 2015-05-26 | 5050692-04 | 0.456 ppb |
| 2015-05-26 | 5050692-02 | 0.527 ppb |
| 2015-05-26 | 5050692-01 | 0.412 ppb |
| 2015-08-05 | 5080134-08 | 0.322 ppb |
| 2015-08-05 | 5080134-05 | 0.263 ppb |
| 2015-08-05 | 5080134-06 | 0.283 ppb |
| 2015-09-15 | 5090438-04 | 1.28 ppb |
| 2015-09-15 | 5090438-02 | 5.47 ppb |
| 2015-11-16 | 5110490-04 | 0.612 ppb |
| 2015-11-16 | 5110490-01 | 0.470 ppb |
| 2015-11-16 | 5110490-03 | 0.654 ppb |
| 2015-11-16 | 5110490-02 | 0.461 ppb |
| 2016-03-01 | 6030031-02 | 1.24 ppb |
| 2016-03-01 | 6030031-03 | 1.73 ppb |
| 2016-03-01 | 6030031-01 | 0.403 ppb |
| 2016-03-01 | 6030031-04 | 0.316 ppb |
| 2016-05-16 | 6050531-02 | 0.561 ppb |
| 2016-05-16 | 6050531-04 | 0.356 ppb |
| 2016-05-16 | 6050531-01 | 0.545 ppb |
| 2016-05-16 | 6050531-03 | 0.722 ppb |
| 2016-08-23 | 6080768-03 | 0.641 ppb |
| 2016-08-23 | 6080768-01 | 0.427 ppb |
| 2016-08-23 | 6080768-04 | 0.442 ppb |
| 2016-08-23 | 6080768-02 | 1.13 ppb |
| 2016-09-14 | 6090371-05 | 7.11 ppb |
| 2016-09-14 | 6090371-06 | 1.79 ppb |
| 2017-02-22 | 7020612-07 | 0.377 ppb |
| 2017-05-24 | 7050866-06 | 0.297 ppb |
| 2017-05-24 | 7050866-05 | 0.602 ppb |
| 2017-08-16 | 7080612-06 | 0.260 ppb |
| 2017-08-30 | 7081050-01 | 0.286 ppb |
| 2017-09-19 | 7090564-04 | 5.10 ppb |
| 2017-09-19 | 7090564-02 | 1.01 ppb |
| 2017-11-21 | 7110768-02 | 1.89 ppb |
| 2017-11-21 | 7110768-04 | 0.352 ppb |
| 2018-02-14 | 8020424-05 | 0.577 ppb |
| 2018-02-14 | 8020424-06 | 0.491 ppb |
| 2018-05-24 | 8051065-03 | 0.504 ppb |
| 2018-05-24 | 8051065-02 | 1.25 ppb |
| 2018-05-24 | 8051065-01 | 0.779 ppb |
| 2018-08-23 | 8080967-02 | 0.504 ppb |
| 2018-08-23 | 8080967-05 | 1.10 ppb |
| 2018-09-20 | 8090815-03 | 3.20 ppb |
| 2018-09-20 | 8090815-04 | 3.77 ppb |
| 2018-11-09 | 8110409-05 | 0.682 ppb |
| 2018-11-09 | 8110409-06 | 6.22 ppb |
| 2019-02-06 | 9020165-03 | 0.933 ppb |
| 2019-02-06 | 9020165-01 | 0.805 ppb |
| 2019-02-06 | 9020165-02 | 0.646 ppb |
| 2019-09-25 | 3060127001 | 2.70 ppb |
| 2019-09-25 | 3060127003 | 5.90 ppb |