Dibromochloromethane
City of Lock Haven 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 | 0.200 ppb | 8 | 3 | ND - 0.580 ppb |
| 2015 | 0.773 ppb | 8 | 7 | ND - 1.91 ppb |
| 2016 | 0.700 ppb | 8 | 6 | ND - 2.05 ppb |
| 2017 | 0.393 ppb | 8 | 5 | ND - 1.21 ppb |
| 2018 | 0.230 ppb | 8 | 2 | ND - 0.970 ppb |
| 2019 | 0.231 ppb | 9 | 3 | ND - 0.780 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 |
|---|---|---|
| 2014-02-05 | 34327-01 | ND |
| 2014-02-06 | 34348-02 | ND |
| 2014-05-07 | 38244-01 | ND |
| 2014-05-07 | 38206-02 | 0.500 ppb |
| 2014-08-06 | 43128-04 | ND |
| 2014-08-06 | 43128-01 | ND |
| 2014-11-05 | 47896-01 | 0.520 ppb |
| 2014-11-05 | 47896-03 | 0.580 ppb |
| 2015-02-04 | 12448135 | 0.560 ppb |
| 2015-02-04 | 12448136 | 0.640 ppb |
| 2015-05-06 | 12803840 | 1.91 ppb |
| 2015-05-06 | 12803839 | 0.940 ppb |
| 2015-08-05 | 13186330 | 0.890 ppb |
| 2015-08-05 | 13186329 | 0.690 ppb |
| 2015-11-04 | 13563065 | ND |
| 2015-11-04 | 13563071 | 0.550 ppb |
| 2016-02-24 | 13918231 | ND |
| 2016-02-24 | 13918225 | ND |
| 2016-05-04 | 14314351 | 2.05 ppb |
| 2016-05-04 | 14314357 | 1.04 ppb |
| 2016-08-03 | 14806285 | 0.700 ppb |
| 2016-08-03 | 14806286 | 0.800 ppb |
| 2016-11-02 | 15284219 | 0.600 ppb |
| 2016-11-02 | 15284225 | 0.410 ppb |
| 2017-02-01 | 15711026 | 0.350 ppb |
| 2017-02-01 | 15711032 | 0.300 ppb |
| 2017-05-03 | 16160871 | 1.21 ppb |
| 2017-05-03 | 16160877 | 0.780 ppb |
| 2017-08-02 | 16631057 | 0.500 ppb |
| 2017-08-02 | 16631063 | ND |
| 2017-11-08 | 17078694 | ND |
| 2017-11-08 | 17078703 | ND |
| 2018-02-07 | 1803426-02 | ND |
| 2018-02-07 | 1803426-01 | ND |
| 2018-05-09 | 1811187-02 | 0.870 ppb |
| 2018-05-09 | 1811187-01 | 0.970 ppb |
| 2018-08-08 | 1821212-01 | ND |
| 2018-08-08 | 1821212-02 | ND |
| 2018-11-07 | 1829271-01 | ND |
| 2018-11-07 | 1829271-02 | ND |
| 2019-02-06 | 7078900003 | ND |
| 2019-03-06 | 7081793001 | ND |
| 2019-03-06 | 7081793003 | ND |
| 2019-05-08 | 7088861001 | ND |
| 2019-05-08 | 7088861002 | 0.530 ppb |
| 2019-08-07 | 9H08230-01 | 0.780 ppb |
| 2019-08-07 | 9H08230-02 | 0.770 ppb |
| 2019-11-06 | 9K08052-01 | ND |
| 2019-11-06 | 9K08054-01 | ND |