Dibromochloromethane

City of Watsonville

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

221

Samples

Samples exceeding legal limit (MCL)

190

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	1.95 ppb	47	32	ND - 4.80 ppb
2015	3.28 ppb	32	31	ND - 5.70 ppb
2016	5.59 ppb	32	32	1.20 ppb - 19.0 ppb
2017	3.42 ppb	46	32	ND - 13.0 ppb
2018	6.60 ppb	32	32	1.60 ppb - 18.0 ppb
2019	4.70 ppb	32	31	ND - 10.00 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
2014-02-19	9590-009-1430	ND
2014-02-19	9590-801-1310	4.00 ppb
2014-02-19	9590-802-1030	2.20 ppb
2014-02-19	9590-803-0945	2.90 ppb
2014-02-19	9590-804-1145	3.10 ppb
2014-02-19	9590-805-0850	2.30 ppb
2014-02-19	9590-806-1345	2.70 ppb
2014-02-19	9590-807-1125	1.50 ppb
2014-02-19	9590-808-0915	1.30 ppb
2014-03-19	9590-004-0800	ND
2014-03-19	9590-005-0745	ND
2014-03-19	9590-006-0800	ND
2014-03-19	9590-007-0840	ND
2014-03-19	9590-009-1100	ND
2014-03-19	9590-010-0915	ND
2014-03-19	9590-011-1000	ND
2014-03-19	9590-012-0920	ND
2014-03-19	9590-013-0835	ND
2014-03-19	9590-014-0740	ND
2014-03-19	9590-015-0805	ND
2014-03-19	9590-016-0900	ND
2014-03-19	9590-029-0845	ND
2014-03-19	9590-030-0900	ND
2014-05-21	9590-801-1000	3.30 ppb
2014-05-21	9590-802-0915	2.90 ppb
2014-05-21	9590-803-0845	3.20 ppb
2014-05-21	9590-804-0945	2.30 ppb
2014-05-21	9590-805-0809	4.50 ppb
2014-05-21	9590-806-1020	4.00 ppb
2014-05-21	9590-807-0930	2.40 ppb
2014-05-21	9590-808-0828	1.80 ppb
2014-08-13	9590-801-1110	3.30 ppb
2014-08-13	9590-802-0950	2.10 ppb
2014-08-13	9590-803-0920	2.60 ppb
2014-08-13	9590-804-1040	3.50 ppb
2014-08-13	9590-805-0815	3.50 ppb
2014-08-13	9590-806-1145	3.40 ppb
2014-08-13	9590-807-1020	4.80 ppb
2014-08-13	9590-808-0845	2.10 ppb
2014-11-12	9590-801-1145	3.10 ppb
2014-11-12	9590-802-1000	3.40 ppb
2014-11-12	9590-803-0940	3.30 ppb
2014-11-12	9590-804-1045	1.60 ppb
2014-11-12	9590-805-0900	3.60 ppb
2014-11-12	9590-806-1215	3.80 ppb
2014-11-12	9590-807-1025	1.60 ppb
2014-11-12	9590-808-0920	1.60 ppb
2015-02-09	9590-801-1150	5.20 ppb
2015-02-09	9590-802-1035	3.00 ppb
2015-02-09	9590-803-1010	2.90 ppb
2015-02-09	9590-804-1120	3.90 ppb
2015-02-09	9590-805-0920	2.70 ppb
2015-02-09	9590-806-1210	2.90 ppb
2015-02-09	9590-807-1100	4.20 ppb
2015-02-09	9590-808-0945	1.40 ppb
2015-05-13	9590-801-1110	4.20 ppb
2015-05-13	9590-802-1000	4.10 ppb
2015-05-13	9590-803-0930	2.80 ppb
2015-05-13	9590-804-1020	4.30 ppb
2015-05-13	9590-805-0830	3.70 ppb
2015-05-13	9590-806-1135	4.60 ppb
2015-05-13	9590-807-1050	4.30 ppb
2015-05-13	9590-808-0900	1.80 ppb
2015-08-12	9590-801-1130	2.20 ppb
2015-08-12	9590-802-1015	2.40 ppb
2015-08-12	9590-803-0945	4.80 ppb
2015-08-12	9590-804-1100	2.20 ppb
2015-08-12	9590-805-0855	4.10 ppb
2015-08-12	9590-806-1300	5.70 ppb
2015-08-12	9590-807-1040	1.30 ppb
2015-08-12	9590-808-0930	1.60 ppb
2015-11-09	9590-801-1250	5.20 ppb
2015-11-09	9590-802-1130	4.20 ppb
2015-11-09	9590-803-1100	3.50 ppb
2015-11-09	9590-804-1230	ND
2015-11-09	9590-805-1005	3.10 ppb
2015-11-09	9590-806-1310	3.60 ppb
2015-11-09	9590-807-1200	3.30 ppb
2015-11-09	9590-808-1035	1.90 ppb
2016-02-10	9590-801-1150	3.10 ppb
2016-02-10	9590-802-1045	3.80 ppb
2016-02-10	9590-803-1010	3.00 ppb
2016-02-10	9590-804-1130	3.70 ppb
2016-02-10	9590-805-0900	2.60 ppb
2016-02-10	9590-806-1215	2.20 ppb
2016-02-10	9590-807-1110	3.90 ppb
2016-02-10	9590-808-0930	1.20 ppb
2016-05-23	9590-801-1130	2.60 ppb
2016-05-23	9590-802-1030	3.50 ppb
2016-05-23	9590-803-0930	4.40 ppb
2016-05-23	9590-804-1105	2.70 ppb
2016-05-23	9590-805-0845	4.90 ppb
2016-05-23	9590-806-1155	3.90 ppb
2016-05-23	9590-807-1050	2.60 ppb
2016-05-23	9590-808-0905	2.00 ppb
2016-08-17	9590-801-1300	4.40 ppb
2016-08-17	9590-802-1130	19.0 ppb
2016-08-17	9590-803-1030	15.0 ppb
2016-08-17	9590-804-1330	17.0 ppb
2016-08-17	9590-805-0915	5.50 ppb
2016-08-17	9590-806-1350	18.0 ppb
2016-08-17	9590-807-1230	17.0 ppb
2016-08-17	9590-808-1000	4.10 ppb
2016-11-09	9590-801-1230	5.20 ppb
2016-11-09	9590-802-1015	4.80 ppb
2016-11-09	9590-803-0950	3.50 ppb
2016-11-09	9590-804-1200	3.80 ppb
2016-11-09	9590-805-0905	4.60 ppb
2016-11-09	9590-806-1250	3.40 ppb
2016-11-09	9590-807-1050	2.10 ppb
2016-11-09	9590-808-0930	1.30 ppb
2017-02-27	9590-801-1215	3.90 ppb
2017-02-27	9590-802-1015	4.40 ppb
2017-02-27	9590-803-0945	3.10 ppb
2017-02-27	9590-804-1115	3.70 ppb
2017-02-27	9590-805-0845	2.10 ppb
2017-02-27	9590-806-1235	2.30 ppb
2017-02-27	9590-807-1045	3.90 ppb
2017-02-27	9590-808-0915	1.30 ppb
2017-03-15	9590-004-1040	ND
2017-03-15	9590-005-0905	ND
2017-03-15	9590-006-0910	ND
2017-03-15	9590-007-1100	ND
2017-03-15	9590-009-1030	ND
2017-03-15	9590-010-0955	ND
2017-03-15	9590-011-1010	ND
2017-03-15	9590-012-0935	ND
2017-03-15	9590-013-0945	ND
2017-03-15	9590-014-0825	ND
2017-03-15	9590-015-1010	ND
2017-03-15	9590-016-0840	ND
2017-03-15	9590-029-0830	ND
2017-03-15	9590-030-1100	ND
2017-05-31	9590-801-1130	1.70 ppb
2017-05-31	9590-802-1025	2.80 ppb
2017-05-31	9590-803-1000	3.20 ppb
2017-05-31	9590-804-1110	2.20 ppb
2017-05-31	9590-805-0900	3.30 ppb
2017-05-31	9590-806-1150	4.40 ppb
2017-05-31	9590-807-1050	2.10 ppb
2017-05-31	9590-808-0935	2.40 ppb
2017-08-16	9590-801-1255	7.30 ppb
2017-08-16	9590-802-1150	5.80 ppb
2017-08-16	9590-803-1040	8.60 ppb
2017-08-16	9590-804-1220	7.80 ppb
2017-08-16	9590-805-0950	4.40 ppb
2017-08-16	9590-806-1330	13.0 ppb
2017-08-16	9590-807-1240	7.70 ppb
2017-08-16	9590-808-1020	6.50 ppb
2017-11-14	9590-801-1200	5.20 ppb
2017-11-14	9590-802-1035	7.90 ppb
2017-11-14	9590-803-1010	5.90 ppb
2017-11-14	9590-804-1110	7.70 ppb
2017-11-14	9590-805-0920	3.20 ppb
2017-11-14	9590-806-1230	5.80 ppb
2017-11-14	9590-807-1130	7.70 ppb
2017-11-14	9590-808-0950	5.90 ppb
2018-02-14	9590-801-1300	2.80 ppb
2018-02-14	9590-802-1200	3.00 ppb
2018-02-14	9590-803-1140	2.90 ppb
2018-02-14	9590-804-1240	3.10 ppb
2018-02-14	9590-805-1100	3.00 ppb
2018-02-14	9590-806-1315	3.30 ppb
2018-02-14	9590-807-1220	3.30 ppb
2018-02-14	9590-808-1120	2.70 ppb
2018-05-09	9590-801-1410	2.70 ppb
2018-05-09	9590-802-1310	2.50 ppb
2018-05-09	9590-803-1240	2.70 ppb
2018-05-09	9590-804-1350	2.20 ppb
2018-05-09	9590-805-1200	3.60 ppb
2018-05-09	9590-806-1440	3.40 ppb
2018-05-09	9590-807-1330	1.70 ppb
2018-05-09	9590-808-1220	1.60 ppb
2018-08-22	9590-801-1010	15.0 ppb
2018-08-22	9590-802-1040	14.0 ppb
2018-08-22	9590-803-1110	17.0 ppb
2018-08-22	9590-804-0920	13.0 ppb
2018-08-22	9590-805-1200	4.60 ppb
2018-08-22	9590-806-0830	18.0 ppb
2018-08-22	9590-807-0945	14.0 ppb
2018-08-22	9590-808-1130	3.60 ppb
2018-11-13	9590-801-1210	9.90 ppb
2018-11-13	9590-802-1045	11.0 ppb
2018-11-13	9590-803-1015	9.70 ppb
2018-11-13	9590-804-1100	10.00 ppb
2018-11-13	9590-805-0930	2.70 ppb
2018-11-13	9590-806-1230	9.30 ppb
2018-11-13	9590-807-1130	10.00 ppb
2018-11-13	9590-808-1000	4.90 ppb
2019-02-20	9590-801-1100	1.60 ppb
2019-02-20	9590-802-0955	2.30 ppb
2019-02-20	9590-803-0935	2.20 ppb
2019-02-20	9590-804-1040	2.60 ppb
2019-02-20	9590-805-0825	2.00 ppb
2019-02-20	9590-806-1125	1.40 ppb
2019-02-20	9590-807-1020	2.80 ppb
2019-02-20	9590-808-0915	ND
2019-05-08	9590-801-1000	1.10 ppb
2019-05-08	9590-802-0900	2.20 ppb
2019-05-08	9590-803-0845	2.80 ppb
2019-05-08	9590-804-0940	2.50 ppb
2019-05-08	9590-805-0800	3.90 ppb
2019-05-08	9590-806-1030	2.30 ppb
2019-05-08	9590-807-0920	2.90 ppb
2019-05-08	9590-808-0820	1.30 ppb
2019-08-14	9590-801-1230	7.20 ppb
2019-08-14	9590-802-1110	8.30 ppb
2019-08-14	9590-803-1040	10.00 ppb
2019-08-14	9590-804-1210	9.30 ppb
2019-08-14	9590-805-0945	3.90 ppb
2019-08-14	9590-806-1250	8.40 ppb
2019-08-14	9590-807-1150	9.00 ppb
2019-08-14	9590-808-1010	2.00 ppb
2019-11-13	9590-801-1030	8.60 ppb
2019-11-13	9590-802-0915	8.70 ppb
2019-11-13	9590-803-0850	8.20 ppb
2019-11-13	9590-804-1015	8.90 ppb
2019-11-13	9590-805-0815	5.40 ppb
2019-11-13	9590-806-1050	7.80 ppb
2019-11-13	9590-807-1000	8.90 ppb
2019-11-13	9590-808-0835	1.80 ppb