Bromodichloromethane

Falmouth 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.

MORE ABOUT THIS CONTAMINANT

188

Samples

Samples exceeding legal limit (MCL)

165

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	3.10 ppb	2	2	0.500 ppb - 5.70 ppb
2015	8.17 ppb	21	17	ND - 19.1 ppb
2016	7.06 ppb	49	40	ND - 18.4 ppb
2017	6.32 ppb	38	35	ND - 16.9 ppb
2018	3.88 ppb	40	33	ND - 10.9 ppb
2019	4.14 ppb	38	38	0.590 ppb - 8.97 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	Result
2014-01-14	5.70 ppb
2014-07-10	0.500 ppb
2015-01-13	2.82 ppb
2015-07-07	ND
2015-07-07	ND
2015-08-20	ND
2015-09-03	2.53 ppb
2015-09-03	11.7 ppb
2015-09-03	16.7 ppb
2015-09-03	14.6 ppb
2015-09-03	10.1 ppb
2015-09-03	8.04 ppb
2015-09-03	11.7 ppb
2015-09-03	8.84 ppb
2015-10-15	ND
2015-12-03	2.57 ppb
2015-12-03	8.66 ppb
2015-12-03	18.8 ppb
2015-12-03	19.1 ppb
2015-12-03	12.9 ppb
2015-12-03	5.67 ppb
2015-12-03	1.78 ppb
2015-12-03	15.0 ppb
2016-01-11	ND
2016-01-11	6.42 ppb
2016-01-12	ND
2016-01-26	ND
2016-01-27	ND
2016-01-27	5.38 ppb
2016-01-28	5.03 ppb
2016-02-04	5.56 ppb
2016-02-05	5.46 ppb
2016-02-08	6.02 ppb
2016-02-09	4.77 ppb
2016-02-10	8.85 ppb
2016-03-02	0.810 ppb
2016-03-02	5.26 ppb
2016-03-02	17.3 ppb
2016-03-02	14.5 ppb
2016-03-02	9.12 ppb
2016-03-02	7.10 ppb
2016-03-02	3.67 ppb
2016-03-02	11.1 ppb
2016-04-11	ND
2016-04-11	ND
2016-05-20	ND
2016-06-02	2.35 ppb
2016-06-02	7.62 ppb
2016-06-02	15.6 ppb
2016-06-02	12.2 ppb
2016-06-02	7.48 ppb
2016-06-02	7.48 ppb
2016-06-02	8.64 ppb
2016-06-02	8.15 ppb
2016-07-18	ND
2016-09-01	6.07 ppb
2016-09-01	14.8 ppb
2016-09-01	18.1 ppb
2016-09-01	16.1 ppb
2016-09-01	12.0 ppb
2016-09-01	9.19 ppb
2016-09-01	18.4 ppb
2016-09-01	9.21 ppb
2016-10-04	ND
2016-12-05	1.82 ppb
2016-12-05	4.76 ppb
2016-12-05	12.9 ppb
2016-12-05	8.45 ppb
2016-12-05	10.6 ppb
2016-12-05	4.99 ppb
2016-12-05	3.54 ppb
2016-12-05	9.17 ppb
2017-01-04	ND
2017-01-04	3.03 ppb
2017-03-06	2.16 ppb
2017-03-06	4.92 ppb
2017-03-06	10.9 ppb
2017-03-06	11.6 ppb
2017-03-06	6.40 ppb
2017-03-06	3.04 ppb
2017-03-06	4.35 ppb
2017-03-06	6.86 ppb
2017-04-06	ND
2017-04-06	0.550 ppb
2017-05-12	2.00 ppb
2017-06-05	8.05 ppb
2017-06-05	4.54 ppb
2017-06-05	16.9 ppb
2017-06-05	12.7 ppb
2017-06-05	10.8 ppb
2017-06-05	8.97 ppb
2017-06-05	11.0 ppb
2017-06-05	8.09 ppb
2017-09-05	4.14 ppb
2017-09-05	9.31 ppb
2017-09-05	12.4 ppb
2017-09-05	9.36 ppb
2017-09-05	7.62 ppb
2017-09-05	5.05 ppb
2017-09-05	9.07 ppb
2017-09-05	7.64 ppb
2017-10-24	ND
2017-12-04	2.59 ppb
2017-12-04	2.71 ppb
2017-12-04	7.32 ppb
2017-12-04	7.57 ppb
2017-12-04	6.48 ppb
2017-12-04	1.20 ppb
2017-12-04	2.25 ppb
2017-12-04	8.60 ppb
2018-01-08	ND
2018-03-05	1.71 ppb
2018-03-05	2.12 ppb
2018-03-05	4.49 ppb
2018-03-05	6.87 ppb
2018-03-05	3.03 ppb
2018-03-05	ND
2018-03-05	0.550 ppb
2018-03-05	7.05 ppb
2018-04-10	ND
2018-04-10	ND
2018-04-17	ND
2018-06-04	3.16 ppb
2018-06-04	4.42 ppb
2018-06-04	7.55 ppb
2018-06-04	3.34 ppb
2018-06-04	3.25 ppb
2018-06-04	2.21 ppb
2018-06-04	1.54 ppb
2018-06-04	5.63 ppb
2018-07-17	ND
2018-07-17	0.820 ppb
2018-09-05	5.89 ppb
2018-09-05	8.69 ppb
2018-09-05	7.30 ppb
2018-09-05	6.57 ppb
2018-09-05	2.51 ppb
2018-09-05	5.44 ppb
2018-09-05	6.18 ppb
2018-09-06	10.3 ppb
2018-10-02	1.12 ppb
2018-10-09	ND
2018-12-07	2.24 ppb
2018-12-07	4.82 ppb
2018-12-07	7.41 ppb
2018-12-07	7.90 ppb
2018-12-07	6.09 ppb
2018-12-07	0.880 ppb
2018-12-07	3.34 ppb
2018-12-07	10.9 ppb
2019-01-08	0.590 ppb
2019-03-18	1.58 ppb
2019-03-18	1.90 ppb
2019-03-18	6.76 ppb
2019-03-18	6.33 ppb
2019-03-18	5.92 ppb
2019-03-18	0.720 ppb
2019-03-18	1.51 ppb
2019-03-18	7.83 ppb
2019-05-15	1.23 ppb
2019-05-15	1.45 ppb
2019-06-12	2.68 ppb
2019-06-12	4.13 ppb
2019-06-12	6.94 ppb
2019-06-12	6.06 ppb
2019-06-12	5.69 ppb
2019-06-12	2.03 ppb
2019-06-12	2.83 ppb
2019-06-12	6.09 ppb
2019-07-09	1.33 ppb
2019-07-09	3.04 ppb
2019-09-12	5.63 ppb
2019-09-12	4.67 ppb
2019-09-12	5.50 ppb
2019-09-12	5.83 ppb
2019-09-12	4.92 ppb
2019-09-12	1.91 ppb
2019-09-12	5.58 ppb
2019-09-12	6.67 ppb
2019-10-01	0.890 ppb
2019-12-09	3.30 ppb
2019-12-09	3.51 ppb
2019-12-09	6.84 ppb
2019-12-09	8.21 ppb
2019-12-09	6.50 ppb
2019-12-09	0.820 ppb
2019-12-09	1.11 ppb
2019-12-09	8.97 ppb