Dibromochloromethane
Lowell Regional Water Utility
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 | 0.900 ppb | 2 | 2 | 0.900 ppb |
| 2015 | 3.55 ppb | 2 | 2 | 1.20 ppb - 5.90 ppb |
| 2016 | 1.20 ppb | 3 | 3 | 0.600 ppb - 2.20 ppb |
| 2017 | 1.62 ppb | 26 | 18 | ND - 5.00 ppb |
| 2018 | 0.838 ppb | 36 | 27 | ND - 2.40 ppb |
| 2019 | 1.78 ppb | 36 | 32 | ND - 7.90 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 | Result |
|---|---|
| 2014-05-14 | 0.900 ppb |
| 2014-08-25 | 0.900 ppb |
| 2015-05-12 | 1.20 ppb |
| 2015-08-10 | 5.90 ppb |
| 2016-02-08 | 0.800 ppb |
| 2016-05-09 | 0.600 ppb |
| 2016-08-08 | 2.20 ppb |
| 2017-05-09 | 0.760 ppb |
| 2017-05-09 | 0.660 ppb |
| 2017-05-09 | ND |
| 2017-05-09 | ND |
| 2017-05-09 | 0.590 ppb |
| 2017-05-09 | 0.700 ppb |
| 2017-05-09 | 0.590 ppb |
| 2017-05-09 | ND |
| 2017-08-08 | 3.50 ppb |
| 2017-08-08 | 4.40 ppb |
| 2017-08-08 | 3.50 ppb |
| 2017-08-08 | 3.00 ppb |
| 2017-08-08 | 3.10 ppb |
| 2017-08-08 | 4.40 ppb |
| 2017-08-08 | 1.30 ppb |
| 2017-08-08 | 2.10 ppb |
| 2017-08-08 | 3.20 ppb |
| 2017-11-07 | 1.000 ppb |
| 2017-11-07 | ND |
| 2017-11-07 | ND |
| 2017-11-07 | ND |
| 2017-11-07 | 2.00 ppb |
| 2017-11-07 | 2.20 ppb |
| 2017-11-07 | ND |
| 2017-11-07 | ND |
| 2017-11-07 | 5.00 ppb |
| 2018-02-12 | 0.770 ppb |
| 2018-02-12 | 0.870 ppb |
| 2018-02-12 | 0.710 ppb |
| 2018-02-12 | 0.640 ppb |
| 2018-02-12 | 0.830 ppb |
| 2018-02-12 | 0.850 ppb |
| 2018-02-12 | 0.930 ppb |
| 2018-02-12 | ND |
| 2018-02-12 | 1.60 ppb |
| 2018-05-07 | 0.790 ppb |
| 2018-05-07 | 0.750 ppb |
| 2018-05-07 | 0.600 ppb |
| 2018-05-07 | ND |
| 2018-05-07 | 0.780 ppb |
| 2018-05-07 | 0.760 ppb |
| 2018-05-07 | 0.720 ppb |
| 2018-05-07 | ND |
| 2018-05-07 | 1.60 ppb |
| 2018-08-14 | 1.20 ppb |
| 2018-08-14 | 2.00 ppb |
| 2018-08-14 | 1.20 ppb |
| 2018-08-14 | 1.20 ppb |
| 2018-08-14 | 1.80 ppb |
| 2018-08-14 | 1.80 ppb |
| 2018-08-14 | 1.40 ppb |
| 2018-08-14 | 0.900 ppb |
| 2018-08-14 | 2.40 ppb |
| 2018-11-14 | 1.60 ppb |
| 2018-11-14 | ND |
| 2018-11-14 | ND |
| 2018-11-14 | ND |
| 2018-11-14 | 0.720 ppb |
| 2018-11-14 | 0.730 ppb |
| 2018-11-14 | ND |
| 2018-11-14 | ND |
| 2018-11-14 | ND |
| 2019-02-12 | 1.000 ppb |
| 2019-02-12 | 0.710 ppb |
| 2019-02-12 | 0.550 ppb |
| 2019-02-12 | ND |
| 2019-02-12 | 0.830 ppb |
| 2019-02-12 | 1.000 ppb |
| 2019-02-12 | 0.850 ppb |
| 2019-02-12 | 2.40 ppb |
| 2019-02-13 | ND |
| 2019-05-14 | 0.960 ppb |
| 2019-05-14 | 0.870 ppb |
| 2019-05-14 | 0.760 ppb |
| 2019-05-14 | 0.770 ppb |
| 2019-05-14 | 0.720 ppb |
| 2019-05-14 | 0.870 ppb |
| 2019-05-14 | 0.940 ppb |
| 2019-05-14 | ND |
| 2019-05-14 | 3.40 ppb |
| 2019-08-13 | 3.20 ppb |
| 2019-08-13 | 4.40 ppb |
| 2019-08-13 | 3.20 ppb |
| 2019-08-13 | 2.70 ppb |
| 2019-08-13 | 3.50 ppb |
| 2019-08-13 | 5.30 ppb |
| 2019-08-13 | 7.90 ppb |
| 2019-08-13 | 3.00 ppb |
| 2019-08-13 | 4.20 ppb |
| 2019-11-13 | 1.20 ppb |
| 2019-11-13 | 0.740 ppb |
| 2019-11-13 | 0.610 ppb |
| 2019-11-13 | 0.570 ppb |
| 2019-11-13 | 1.40 ppb |
| 2019-11-13 | 1.60 ppb |
| 2019-11-13 | 0.900 ppb |
| 2019-11-13 | ND |
| 2019-11-13 | 3.10 ppb |