Bromodichloromethane

PUD #1 of Asotin County

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

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	0.0442 ppb	12	1	ND - 0.530 ppb
2015	0.463 ppb	8	5	ND - 0.880 ppb
2016	0.605 ppb	2	2	0.560 ppb - 0.650 ppb
2017	0.255 ppb	2	1	ND - 0.510 ppb
2018	ND	8	0	ND
2019	ND	2	0	ND

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	Lab ID	Result
2014-06-05	98389	ND
2014-06-05	98387	ND
2014-06-05	98385	0.530 ppb
2014-06-05	98391	ND
2014-07-24	00849	ND
2014-07-24	00847	ND
2014-07-24	00853	ND
2014-07-24	00851	ND
2014-10-07	53552	ND
2014-10-07	53556	ND
2014-10-07	53550	ND
2014-10-07	53554	ND
2015-03-30	58639	0.790 ppb
2015-03-30	58637	0.580 ppb
2015-03-30	58633	0.880 ppb
2015-03-30	58635	0.790 ppb
2015-05-21	60409	ND
2015-05-21	60405	ND
2015-05-21	60407	ND
2015-05-21	60403	0.660 ppb
2016-03-17		0.650 ppb
2016-03-17		0.560 ppb
2017-04-19		ND
2017-04-19		0.510 ppb
2018-03-22		ND
2018-03-22		ND
2018-06-20		ND
2018-06-20		ND
2018-06-20		ND
2018-06-20		ND
2018-06-20		ND
2018-06-20		ND
2019-04-09		ND
2019-04-09		ND