Bromate

Loudoun Water - Central System

Bromate is a carcinogenic disinfection byproduct formed when source waters containing bromide are treated with ozonation or sodium hypochlorite. Studies of laboratory animals show that bromate damages DNA and causes cancer in multiple organs. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	ND	4	ND
2019	ND	11	ND

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 bromate was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 10 ppb

The legal limit for bromate, established in 1998, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to bromate exposure.

ppb = parts per billion

All test results

Date	Lab ID	Result
2018-08-13	92395631005_BRO	ND
2018-10-17	92403949004_BRO	ND
2018-11-13	92407704004_BRO	ND
2018-12-11	92410675005_BRO	ND
2019-02-27	92420058001_BRO	ND
2019-03-11	92421748005_BRO	ND
2019-04-15	92426293004_BRO	ND
2019-05-16	92429799004_BRO	ND
2019-06-10	92433278005_BRO	ND
2019-07-15	92437721004_BRO	ND
2019-08-12	92441748004_BRO	ND
2019-09-09	92444743005_BRO	ND
2019-10-15	92450040004_BRO	ND
2019-11-12	92453758005_BRO	ND
2019-12-09	92457145005_BRO	ND