Bromodichloromethane

City of San Jacinto

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
2013	N/A	0	0	N/A
2014	5.61 ppb	15	15	0.530 ppb - 25.0 ppb
2015	2.43 ppb	12	11	ND - 8.90 ppb
2016	0.539 ppb	8	4	ND - 1.70 ppb
2017	N/A	0	0	N/A
2018	6.11 ppb	16	15	ND - 23.0 ppb
2019	4.20 ppb	16	12	ND - 8.30 ppb

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
2014-03-12	4790-009-0849	5.60 ppb
2014-03-18	4790-804-1410	1.20 ppb
2014-03-18	4790-801-1339	4.00 ppb
2014-03-18	4790-803-1328	2.60 ppb
2014-03-18	4790-802-1310	2.00 ppb
2014-06-10	4790-804-0840	0.640 ppb
2014-06-10	4790-803-0750	0.860 ppb
2014-06-10	4790-801-0810	0.650 ppb
2014-06-10	4790-802-0725	21.0 ppb
2014-09-10	4790-804-1145	0.530 ppb
2014-09-10	4790-801-0945	2.90 ppb
2014-09-10	4790-802-0812	12.0 ppb
2014-09-10	4790-803-0852	4.00 ppb
2014-12-08	4790-801-1457	1.10 ppb
2014-12-08	4790-802-1407	25.0 ppb
2015-03-10	4790-803-1410	1.20 ppb
2015-03-10	4790-801-1430	0.840 ppb
2015-03-10	4790-804-1455	1.90 ppb
2015-03-10	4790-802-1330	7.40 ppb
2015-06-09	4790-802-1542	2.20 ppb
2015-06-09	4790-803-1505	ND
2015-06-09	4790-804-1421	0.910 ppb
2015-06-09	4790-801-1342	0.730 ppb
2015-12-08	4790-804-1550	2.10 ppb
2015-12-08	4790-802-1403	8.90 ppb
2015-12-08	4790-803-1515	1.80 ppb
2015-12-08	4790-801-1530	1.20 ppb
2016-01-20	4790-014-0847	ND
2016-01-27	4790-005-0840	ND
2016-02-23	4790-001-1430	ND
2016-03-02	4790-010-1420	ND
2016-06-07	4790-802-0825	1.70 ppb
2016-06-07	4790-804-1021	0.660 ppb
2016-06-07	4790-803-0908	1.40 ppb
2016-06-07	4790-801-0944	0.550 ppb
2018-03-14	4790-803-0715	6.20 ppb
2018-03-14	4790-801-0800	6.10 ppb
2018-03-14	4790-802-0925	4.00 ppb
2018-03-14	4790-804-0842	4.80 ppb
2018-06-13	4790-803-0925	3.50 ppb
2018-06-13	4790-801-0700	3.30 ppb
2018-06-13	4790-802-0900	4.80 ppb
2018-06-13	4790-804-0740	4.00 ppb
2018-09-19	4790-803-0953	21.0 ppb
2018-09-19	4790-801-0934	4.30 ppb
2018-09-19	4790-802-0820	23.0 ppb
2018-09-19	4790-804-1027	5.00 ppb
2018-12-12	4790-801-0730	2.70 ppb
2018-12-12	4790-804-0835	ND
2018-12-12	4790-802-1042	2.30 ppb
2018-12-12	4790-803-0943	2.70 ppb
2019-03-13	4790-804-0950	5.20 ppb
2019-03-13	4790-802-0715	4.50 ppb
2019-03-13	4790-801-0904	5.20 ppb
2019-03-13	4790-803-0800	4.60 ppb
2019-03-20	4790-010-0701	ND
2019-03-27	4790-014-0701	ND
2019-09-11	4790-802-0715	5.80 ppb
2019-09-11	4790-803-0920	6.60 ppb
2019-09-11	4790-801-0853	4.80 ppb
2019-09-11	4790-804-1001	6.20 ppb
2019-12-10	4790-010-1330	ND
2019-12-11	4790-803-0730	5.80 ppb
2019-12-11	4790-801-0824	8.30 ppb
2019-12-11	4790-802-0700	5.90 ppb
2019-12-11	4790-804-1030	4.30 ppb
2019-12-11	4790-005-0900	ND