Dibromochloromethane
Perry Village
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 | 0.867 ppb | 6 | 6 | 0.640 ppb - 1.07 ppb |
| 2015 | 0.446 ppb | 9 | 6 | ND - 0.880 ppb |
| 2016 | 0.942 ppb | 11 | 11 | 0.500 ppb - 1.50 ppb |
| 2017 | 0.537 ppb | 9 | 7 | ND - 0.900 ppb |
| 2018 | 1.02 ppb | 8 | 8 | 0.500 ppb - 1.40 ppb |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-02-06 | 14020740002THM | 1.07 ppb |
| 2014-02-06 | 14020740001THM | 1.04 ppb |
| 2014-05-08 | 14051820-003THM | 0.820 ppb |
| 2014-05-08 | 14051820-001THM | 0.840 ppb |
| 2014-11-20 | S4K1659THMSMAIN | 0.790 ppb |
| 2014-11-20 | S4K1659THM | 0.640 ppb |
| 2015-02-12 | S5B1098-02THM | 0.550 ppb |
| 2015-02-12 | S5B1098-01THM | ND |
| 2015-05-07 | S5E0817-01 | ND |
| 2015-05-07 | S5E0817THM | ND |
| 2015-08-06 | S5H070802THM | 0.880 ppb |
| 2015-08-06 | S5H0708THM | 0.840 ppb |
| 2015-11-19 | S5K1384-02THM | 0.570 ppb |
| 2015-11-19 | S5K1384-01 | 0.550 ppb |
| 2015-11-19 | S5K1384-03THM | 0.620 ppb |
| 2016-02-04 | R1601020-001 | 0.510 ppb |
| 2016-02-04 | R1601018002 | 0.530 ppb |
| 2016-02-04 | R1601018001 | 0.500 ppb |
| 2016-05-12 | R1604918THM | 0.830 ppb |
| 2016-05-12 | R1604918-003 | 0.960 ppb |
| 2016-05-12 | R1604918001 | 0.810 ppb |
| 2016-08-18 | R1608782001 | 1.50 ppb |
| 2016-08-18 | R1608782003 | 1.50 ppb |
| 2016-08-18 | R1608782002 | 1.30 ppb |
| 2016-11-17 | 2191938002 | 0.990 ppb |
| 2016-11-17 | 2191938001 | 0.930 ppb |
| 2017-02-07 | 2207741002THM | 0.580 ppb |
| 2017-02-07 | 2207741001 | 0.530 ppb |
| 2017-05-11 | 2230301001 | 0.640 ppb |
| 2017-05-11 | 2230301003 | 0.580 ppb |
| 2017-05-11 | 2230301002 | 0.760 ppb |
| 2017-08-23 | R1707835-002 | 0.900 ppb |
| 2017-08-23 | R1707835001 | 0.840 ppb |
| 2017-11-16 | 171128024001 | ND |
| 2017-11-16 | 171128024002 | ND |
| 2018-02-15 | 2296661002THM02 | 0.500 ppb |
| 2018-02-15 | 2296661001THM | 0.530 ppb |
| 2018-05-08 | R1804162001 | 1.000 ppb |
| 2018-05-08 | R1804162002 | 1.000 ppb |
| 2018-06-07 | R1805284THM | 1.20 ppb |
| 2018-08-22 | R1808010-002 | 1.10 ppb |
| 2018-08-22 | R1808010004 | 1.40 ppb |
| 2018-08-22 | R1808010003 | 1.40 ppb |