Bromide

Massachusetts Water Resources Authority (MWRA)

Bromide is a naturally occurring element found in surface waters and groundwater. During drinking water treatment, bromide can combine with chlorine or other disinfectants, contributing to the formation of toxic tap water disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

138

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	12.2 ppb	24	24	7.40 ppb - 14.2 ppb
2015	13.3 ppb	24	24	9.70 ppb - 15.9 ppb
2016	12.9 ppb	22	22	10.3 ppb - 15.1 ppb
2017	14.5 ppb	24	22	ND - 23.6 ppb
2018	16.3 ppb	24	24	12.9 ppb - 18.9 ppb
2019	15.1 ppb	20	18	ND - 21.9 ppb

ppb = parts per billion

All test results

Date	Result
2014-01-06	13.8 ppb
2014-01-06	13.2 ppb
2014-02-03	13.6 ppb
2014-02-03	13.7 ppb
2014-03-03	13.3 ppb
2014-03-03	12.1 ppb
2014-04-07	13.1 ppb
2014-04-07	13.0 ppb
2014-05-05	13.9 ppb
2014-05-05	11.1 ppb
2014-06-02	11.9 ppb
2014-06-03	13.8 ppb
2014-07-07	14.2 ppb
2014-07-07	13.7 ppb
2014-08-05	13.1 ppb
2014-08-05	8.60 ppb
2014-09-09	11.6 ppb
2014-09-09	7.40 ppb
2014-10-06	12.4 ppb
2014-10-06	9.10 ppb
2014-11-04	12.9 ppb
2014-11-04	9.80 ppb
2014-12-01	13.4 ppb
2014-12-01	10.00 ppb
2015-01-05	13.2 ppb
2015-01-05	9.70 ppb
2015-02-02	13.9 ppb
2015-02-02	10.6 ppb
2015-03-02	14.1 ppb
2015-03-02	13.9 ppb
2015-04-06	14.5 ppb
2015-04-06	12.8 ppb
2015-05-04	15.9 ppb
2015-05-04	13.0 ppb
2015-06-01	15.8 ppb
2015-06-01	13.0 ppb
2015-07-06	15.5 ppb
2015-07-06	12.9 ppb
2015-08-03	15.1 ppb
2015-08-03	12.1 ppb
2015-09-08	13.8 ppb
2015-09-08	11.5 ppb
2015-10-05	13.1 ppb
2015-10-05	11.6 ppb
2015-11-02	13.4 ppb
2015-11-02	12.5 ppb
2015-12-07	13.8 ppb
2015-12-07	12.6 ppb
2016-01-04	13.4 ppb
2016-01-04	11.6 ppb
2016-02-01	13.4 ppb
2016-02-01	12.5 ppb
2016-03-07	13.6 ppb
2016-03-07	12.2 ppb
2016-04-04	13.8 ppb
2016-04-04	12.5 ppb
2016-05-02	14.0 ppb
2016-05-02	12.3 ppb
2016-06-06	14.8 ppb
2016-06-06	13.1 ppb
2016-07-05	14.2 ppb
2016-07-05	12.2 ppb
2016-08-01	13.5 ppb
2016-08-01	11.6 ppb
2016-09-06	12.3 ppb
2016-09-06	10.3 ppb
2016-10-04	14.0 ppb
2016-10-04	11.8 ppb
2016-12-05	15.1 ppb
2016-12-05	12.6 ppb
2017-01-03	14.3 ppb
2017-01-03	12.3 ppb
2017-02-06	14.9 ppb
2017-02-06	12.2 ppb
2017-03-06	15.5 ppb
2017-03-06	13.9 ppb
2017-04-04	15.4 ppb
2017-04-04	13.8 ppb
2017-05-01	16.1 ppb
2017-05-01	13.6 ppb
2017-06-05	17.3 ppb
2017-06-05	15.0 ppb
2017-07-11	18.1 ppb
2017-07-11	14.8 ppb
2017-08-07	23.6 ppb
2017-08-07	21.6 ppb
2017-09-05	ND
2017-09-05	ND
2017-10-03	17.1 ppb
2017-10-03	14.1 ppb
2017-11-06	17.0 ppb
2017-11-06	14.5 ppb
2017-12-04	17.1 ppb
2017-12-04	15.3 ppb
2018-01-02	17.3 ppb
2018-01-02	15.6 ppb
2018-02-06	17.5 ppb
2018-02-06	16.1 ppb
2018-03-06	17.8 ppb
2018-03-06	15.8 ppb
2018-04-03	18.2 ppb
2018-04-03	15.3 ppb
2018-05-01	18.4 ppb
2018-05-01	15.8 ppb
2018-06-04	18.4 ppb
2018-06-04	15.2 ppb
2018-07-10	17.9 ppb
2018-07-10	14.3 ppb
2018-08-07	16.5 ppb
2018-08-07	13.6 ppb
2018-09-04	16.4 ppb
2018-09-04	12.9 ppb
2018-10-02	17.4 ppb
2018-10-02	13.2 ppb
2018-11-05	18.7 ppb
2018-11-05	14.9 ppb
2018-12-04	18.9 ppb
2018-12-04	15.3 ppb
2019-01-08	19.3 ppb
2019-01-08	16.3 ppb
2019-03-05	20.6 ppb
2019-03-05	16.4 ppb
2019-04-02	21.9 ppb
2019-04-02	17.5 ppb
2019-05-07	ND
2019-05-07	19.6 ppb
2019-05-07	ND
2019-06-04	14.9 ppb
2019-07-02	18.7 ppb
2019-07-02	14.4 ppb
2019-08-08	17.7 ppb
2019-08-08	13.2 ppb
2019-10-01	16.1 ppb
2019-10-01	13.1 ppb
2019-11-05	16.9 ppb
2019-11-05	13.4 ppb
2019-12-03	17.0 ppb
2019-12-03	14.3 ppb