Bromochloroacetic acid

King County Water District 119

Bromochloroacetic acid is formed when chlorine or other disinfectants are used to treat drinking water. Bromochloroacetic acid and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

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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	0.150 ppb	8	1	ND - 1.20 ppb
2015	0.358 ppb	8	2	ND - 1.69 ppb
2016	0.176 ppb	8	1	ND - 1.41 ppb
2017	ND	8	0	ND
2018	ND	8	0	ND
2019	ND	8	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for bromochloroacetic acid was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-03-10	04306	ND
2014-03-10	04305	ND
2014-06-05	09950	ND
2014-06-05	09951	ND
2014-09-09	16586	ND
2014-09-09	16585	ND
2014-12-10	23656	1.20 ppb
2014-12-10	23655	ND
2015-03-09	64001	ND
2015-03-09	64002	ND
2015-06-08	32902	ND
2015-06-08	32901	ND
2015-09-15	98101	ND
2015-09-15	98102	1.17 ppb
2015-12-08	66702	1.69 ppb
2015-12-08	66701	ND
2016-03-14		ND
2016-03-14		1.41 ppb
2016-06-14		ND
2016-06-14		ND
2016-09-12		ND
2016-09-12		ND
2016-12-13		ND
2016-12-13		ND
2017-03-13		ND
2017-03-13		ND
2017-06-16		ND
2017-06-16		ND
2017-09-13		ND
2017-09-13		ND
2017-12-11		ND
2017-12-11		ND
2018-03-13		ND
2018-03-13		ND
2018-06-12		ND
2018-06-12		ND
2018-09-13		ND
2018-09-13		ND
2018-12-13		ND
2018-12-13		ND
2019-03-14		ND
2019-03-14		ND
2019-06-06		ND
2019-06-06		ND
2019-09-16		ND
2019-09-16		ND
2019-12-13		ND
2019-12-13		ND