Dibromochloromethane

Lockport WD#3

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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	3.88 ppb	16	16	2.83 ppb - 4.95 ppb
2015	3.57 ppb	8	8	2.90 ppb - 4.12 ppb
2016	4.32 ppb	20	20	2.81 ppb - 6.45 ppb
2017	4.80 ppb	12	12	3.41 ppb - 7.91 ppb
2018	4.75 ppb	16	16	3.05 ppb - 6.04 ppb
2019	3.56 ppb	8	8	3.14 ppb - 4.13 ppb

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 dibromochloromethane 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
2014-02-04	1ST QTR DBP14 LR	3.40 ppb
2014-02-04	1ST QTR DBP14 LR	3.69 ppb
2014-02-04	FIRST QTR DBP LR	3.32 ppb
2014-02-04	1ST QTR DBP14 LR	3.59 ppb
2014-05-08	DBP9 TLCKPT 2Q20	2.86 ppb
2014-05-08	DBP9 TLCKPT 2Q20	3.00 ppb
2014-05-08	DBP9 TLCKPT 2Q20	2.87 ppb
2014-05-08	DBP9 TLCKPT 2Q20	2.83 ppb
2014-08-07	DBP9 TLCKPT 3Q20	4.35 ppb
2014-08-07	DBP9 TLCKPT 3Q20	4.59 ppb
2014-09-03	DBP9 TLCKPT 3Q20	4.56 ppb
2014-09-03	DBP9 TLCKPT 3Q20	3.87 ppb
2014-11-07	DBP9 TLCKPT 4Q20	4.77 ppb
2014-11-07	DBP9 TLCKPT 4Q20	4.95 ppb
2014-11-07	DBP9 TLCKPT 4Q20	4.44 ppb
2014-11-07	DBP9 TLCKPT 4Q20	4.91 ppb
2015-02-04	DBP9 TLCKPT 1Q20	3.32 ppb
2015-02-04	DBP9 TLCKPT 1Q20	2.90 ppb
2015-02-04	DBP9 TLCKPT 1Q20	2.96 ppb
2015-02-04	DBP9 TLCKPT 1Q20	3.58 ppb
2015-05-05	DBP9 TLCKPT 2Q20	3.73 ppb
2015-05-05	DBP9 TLCKPT 2Q20	4.06 ppb
2015-05-05	DBP9 TLCKPT 2Q20	3.89 ppb
2015-05-05	DBP9 TLCKPT 2Q20	4.12 ppb
2016-02-03	DBP9 TLCKPT 1Q20	2.81 ppb
2016-02-03	DBP9 TLCKPT 1Q20	3.11 ppb
2016-02-03	DBP9 TLCKPT 1Q20	3.18 ppb
2016-02-03	DBP9 TLCKPT 1Q20	4.49 ppb
2016-02-07	DBP9 TLCKPT 1Q20	3.49 ppb
2016-02-07	DBP9 TLCKPT 1Q20	3.73 ppb
2016-02-07	DBP9 TLCKPT 1Q20	3.63 ppb
2016-02-07	DBP9 TLCKPT 1Q20	3.41 ppb
2016-05-05	DBP9 TLCKPT 2Q20	4.16 ppb
2016-05-05	DBP9 TLCKPT 2Q20	4.32 ppb
2016-05-05	DBP9 TLCKPT 2Q20	3.84 ppb
2016-05-05	DBP9 TLCKPT 2Q20	4.18 ppb
2016-08-09	DBP9 TLCKPT 3Q20	5.97 ppb
2016-08-09	DBP9 TLCKPT 3Q20	6.45 ppb
2016-08-09	DBP9 TLCKPT 3Q20	5.68 ppb
2016-08-09	DBP9 TLCKPT 3Q20	5.74 ppb
2016-11-07	DBP9 TLCKPT 4Q20	3.98 ppb
2016-11-07	DBP9 TLCKPT 4Q20	5.80 ppb
2016-11-07	DBP9 TLCKPT 4Q20	4.38 ppb
2016-11-07	DBP9 TLCKPT 4Q20	4.10 ppb
2017-02-07	DBP9 TLCKPT 1Q20	3.41 ppb
2017-02-07	DBP9 TLCKPT 1Q20	3.73 ppb
2017-02-07	DBP9 TLCKPT 1Q20	3.49 ppb
2017-02-07	DBP9 TLCKPT 1Q20	3.63 ppb
2017-05-05	DBP9 TLCKPT 2Q20	4.40 ppb
2017-05-05	DBP9 TLCKPT 2Q20	4.28 ppb
2017-05-05	DBP9 TLCKPT 2Q20	4.27 ppb
2017-05-05	DBP9 TLCKPT 2Q20	4.26 ppb
2017-08-08	DBP9 TLCKPT 3Q20	5.93 ppb
2017-08-08	DBP9 TLCKPT 3Q20	7.91 ppb
2017-08-08	DBP9 TLCKPT 3Q20	6.18 ppb
2017-08-08	DBP9 TLCKPT 3Q20	6.05 ppb
2018-02-06	DBP9 TLCKPT 1Q20	4.14 ppb
2018-02-06	DBP9 TLCKPT 1Q20	4.30 ppb
2018-02-06	DBP9 TLCKPT 1Q20	4.88 ppb
2018-02-06	DBP9 TLCKPT 1Q20	3.05 ppb
2018-05-09	DBP9 TLCKPT 2Q20	3.97 ppb
2018-05-09	DBP9 TLCKPT 2Q20	4.47 ppb
2018-05-09	DBP9 TLCKPT 2Q20	3.85 ppb
2018-05-09	DBP9 TLCKPT 2Q20	4.00 ppb
2018-08-09	DBP9 TLCKPT 3Q20	6.04 ppb
2018-08-09	DBP9 TLCKPT 3Q20	5.70 ppb
2018-08-09	DBP9 TLCKPT 3Q20	5.64 ppb
2018-08-09	DBP9 TLCKPT 3Q20	5.69 ppb
2018-11-05	DBP9 TLCKPT 4Q20	4.75 ppb
2018-11-05	DBP9 TLCKPT 4Q20	4.86 ppb
2018-11-05	DBP9 TLCKPT 4Q20	4.55 ppb
2018-11-05	DBP9 TLCKPT 4Q20	6.03 ppb
2019-02-04	DBP9 TLCKPT 1Q20	3.69 ppb
2019-02-04	DBP9 TLCKPT 1Q20	3.64 ppb
2019-02-04	DBP9 TLCKPT 1Q20	3.81 ppb
2019-02-04	DBP9 TLCKPT 1Q20	3.14 ppb
2019-05-07	DBP9 TLCKPT 2Q20	3.43 ppb
2019-05-07	DBP9 TLCKPT 2Q20	3.27 ppb
2019-05-07	DBP9 TLCKPT 2Q20	4.13 ppb
2019-05-07	DBP9 TLCKPT 2Q20	3.33 ppb