Bromide

Cambridge Water Department (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.

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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	N/A	0	0	N/A
2015	83.3 ppb	11	11	68.0 ppb - 98.0 ppb
2016	85.4 ppb	12	12	68.0 ppb - 106.0 ppb
2017	80.2 ppb	12	12	58.0 ppb - 103.0 ppb
2018	83.5 ppb	11	11	72.0 ppb - 100.0 ppb
2019	78.6 ppb	12	12	65.0 ppb - 93.0 ppb

ppb = parts per billion

All test results

Date	Result
2015-01-08	86.0 ppb
2015-02-05	84.0 ppb
2015-04-02	84.0 ppb
2015-05-11	77.0 ppb
2015-06-04	77.0 ppb
2015-07-09	68.0 ppb
2015-08-06	78.0 ppb
2015-09-10	87.0 ppb
2015-10-08	88.0 ppb
2015-11-05	89.0 ppb
2015-12-03	98.0 ppb
2016-01-07	94.0 ppb
2016-02-11	74.0 ppb
2016-03-03	68.0 ppb
2016-04-21	78.0 ppb
2016-05-05	74.0 ppb
2016-06-02	77.0 ppb
2016-07-14	73.0 ppb
2016-08-04	84.0 ppb
2016-09-08	101.0 ppb
2016-10-11	106.0 ppb
2016-11-03	106.0 ppb
2016-12-08	90.0 ppb
2017-01-12	103.0 ppb
2017-02-02	85.0 ppb
2017-03-02	73.0 ppb
2017-04-06	77.0 ppb
2017-05-04	69.0 ppb
2017-06-15	58.0 ppb
2017-07-06	62.0 ppb
2017-08-03	73.0 ppb
2017-09-07	81.0 ppb
2017-10-19	88.0 ppb
2017-11-02	91.0 ppb
2017-12-11	102.0 ppb
2018-01-03	100.0 ppb
2018-02-08	88.0 ppb
2018-03-01	83.0 ppb
2018-04-05	76.0 ppb
2018-05-03	78.0 ppb
2018-06-07	72.0 ppb
2018-07-12	86.0 ppb
2018-09-10	97.0 ppb
2018-10-04	80.0 ppb
2018-11-08	84.0 ppb
2018-12-06	75.0 ppb
2019-01-03	93.0 ppb
2019-02-07	82.0 ppb
2019-03-07	74.0 ppb
2019-04-04	77.0 ppb
2019-05-02	75.0 ppb
2019-06-06	72.0 ppb
2019-07-02	71.0 ppb
2019-08-08	76.0 ppb
2019-08-13	79.0 ppb
2019-09-05	89.0 ppb
2019-10-17	90.0 ppb
2019-11-14	65.0 ppb