Bromodichloromethane
Ho Ho Kus Water Department
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 | 0.0868 ppb | 16 | 4 | ND - 0.430 ppb |
| 2015 | 0.537 ppb | 7 | 6 | ND - 1.98 ppb |
| 2016 | 0.796 ppb | 8 | 8 | 0.317 ppb - 2.93 ppb |
| 2017 | 0.979 ppb | 3 | 3 | 0.262 ppb - 1.92 ppb |
| 2018 | 1.04 ppb | 6 | 6 | 0.270 ppb - 2.98 ppb |
| 2019 | 0.950 ppb | 3 | 2 | ND - 2.50 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 |
|---|---|---|
| 2014-03-05 | 4030124-09 | ND |
| 2014-03-05 | 4030124-07 | 0.430 ppb |
| 2014-03-05 | 4030124-08 | 0.270 ppb |
| 2014-03-05 | 4030124-06 | ND |
| 2014-05-13 | 4050425-06 | ND |
| 2014-05-13 | 4050425-07 | 0.370 ppb |
| 2014-05-13 | 4050425-08 | ND |
| 2014-05-13 | 4050425-09 | ND |
| 2014-08-26 | 4080821-02 | ND |
| 2014-08-26 | 4080821-01 | ND |
| 2014-08-26 | 4080821-04 | ND |
| 2014-08-26 | 4080821-03 | ND |
| 2014-12-03 | 4120165-03 | ND |
| 2014-12-03 | 4120165-04 | ND |
| 2014-12-03 | 4120165-02 | 0.318 ppb |
| 2014-12-03 | 4120165-01 | ND |
| 2015-02-11 | 5020292-14 | 0.252 ppb |
| 2015-02-11 | 5020292-12 | 0.567 ppb |
| 2015-05-26 | 5050692-01 | 0.263 ppb |
| 2015-09-15 | 5090438-04 | ND |
| 2015-09-15 | 5090438-02 | 1.98 ppb |
| 2015-11-16 | 5110490-03 | 0.369 ppb |
| 2015-11-16 | 5110490-01 | 0.330 ppb |
| 2016-03-01 | 6030031-02 | 0.570 ppb |
| 2016-03-01 | 6030031-03 | 0.648 ppb |
| 2016-05-16 | 6050531-01 | 0.362 ppb |
| 2016-05-16 | 6050531-03 | 0.345 ppb |
| 2016-08-23 | 6080768-02 | 0.317 ppb |
| 2016-09-14 | 6090371-05 | 2.93 ppb |
| 2016-09-14 | 6090371-06 | 0.625 ppb |
| 2016-11-14 | 6110413-06 | 0.571 ppb |
| 2017-09-19 | 7090564-04 | 1.92 ppb |
| 2017-09-19 | 7090564-02 | 0.262 ppb |
| 2017-11-21 | 7110768-02 | 0.754 ppb |
| 2018-02-14 | 8020424-05 | 0.287 ppb |
| 2018-05-24 | 8051065-02 | 0.395 ppb |
| 2018-05-24 | 8051065-01 | 0.270 ppb |
| 2018-09-20 | 8090815-03 | 1.21 ppb |
| 2018-09-20 | 8090815-04 | 1.07 ppb |
| 2018-11-09 | 8110409-06 | 2.98 ppb |
| 2019-02-06 | 9020165-01 | 0.351 ppb |
| 2019-09-25 | 3060127003 | 2.50 ppb |
| 2019-09-25 | 3060127001 | ND |