Bromodichloromethane

Terra Bella Irrigation District - Tbt

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	7.28 ppb	10	8	ND - 16.0 ppb
2015	21.6 ppb	8	8	9.80 ppb - 31.0 ppb
2016	5.61 ppb	10	8	ND - 10.00 ppb
2017	1.51 ppb	16	8	ND - 6.60 ppb
2018	1.63 ppb	12	8	ND - 2.90 ppb
2019	0.913 ppb	16	8	ND - 3.20 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
2014-02-25	5810-901-0740	5.40 ppb
2014-02-25	5810-900-0755	5.00 ppb
2014-05-07	5810-027-0930	ND
2014-05-19	5810-028-1150	ND
2014-05-27	5810-901-1050	7.00 ppb
2014-05-27	5810-900-1026	6.60 ppb
2014-08-18	5810-901-1555	8.70 ppb
2014-08-18	5810-900-1537	8.10 ppb
2014-11-25	5810-901-0950	16.0 ppb
2014-11-25	5810-900-1015	16.0 ppb
2015-02-25	5810-901-0905	27.0 ppb
2015-02-25	5810-900-0840	31.0 ppb
2015-05-19	5810-901-0945	17.0 ppb
2015-05-19	5810-900-0955	16.0 ppb
2015-08-20	5810-901-1110	9.90 ppb
2015-08-20	5810-900-1130	9.80 ppb
2015-11-24	5810-901-1015	31.0 ppb
2015-11-24	5810-900-0957	31.0 ppb
2016-02-05	5810-004-1150	ND
2016-03-08	5810-901-0915	8.80 ppb
2016-03-08	5810-900-0900	7.40 ppb
2016-05-23	5810-901-1115	5.70 ppb
2016-05-23	5810-900-1130	5.40 ppb
2016-08-25	5810-004-1220	ND
2016-08-30	5810-901-0935	4.60 ppb
2016-08-30	5810-900-0850	4.30 ppb
2016-11-29	5810-901-0940	9.90 ppb
2016-11-29	5810-900-0842	10.00 ppb
2017-03-02	5810-901-0935	6.60 ppb
2017-03-02	5810-900-0920	5.80 ppb
2017-05-11	5810-900-1130	2.40 ppb
2017-05-11	5810-901-1145	2.80 ppb
2017-08-10	5810-900-1020	1.20 ppb
2017-08-10	5810-901-0935	1.60 ppb
2017-09-06	5810-014-1251	ND
2017-09-06	5810-016-1149	ND
2017-09-06	5810-020-1155	ND
2017-09-06	5810-025-1315	ND
2017-09-06	5810-013-1230	ND
2017-09-06	5810-009-1215	ND
2017-09-06	5810-002-1205	ND
2017-09-07	5810-024-1120	ND
2017-11-21	5810-900-0940	1.90 ppb
2017-11-21	5810-901-0915	1.80 ppb
2018-03-15	5810-901-1055	2.00 ppb
2018-03-15	5810-900-1120	2.40 ppb
2018-05-17	5810-901-0920	2.90 ppb
2018-05-17	5810-900-0940	2.60 ppb
2018-09-06	5810-901-1050	2.00 ppb
2018-09-06	5810-900-1030	2.40 ppb
2018-09-24	5810-027-1445	ND
2018-09-24	5810-033-1510	ND
2018-12-06	5810-901-1100	2.70 ppb
2018-12-06	5810-900-1115	2.60 ppb
2018-12-27	5810-027-1250	ND
2018-12-27	5810-033-1230	ND
2019-02-25	5810-901-1040	3.20 ppb
2019-02-25	5810-900-1030	3.00 ppb
2019-02-26	5810-027-1318	ND
2019-02-26	5810-033-1300	ND
2019-05-10	5810-027-1310	ND
2019-05-10	5810-033-1328	ND
2019-06-10	5810-901-0930	1.30 ppb
2019-06-10	5810-900-0940	1.50 ppb
2019-08-16	5810-901-0930	1.30 ppb
2019-08-16	5810-900-0900	1.30 ppb
2019-08-29	5810-033-1328	ND
2019-08-29	5810-027-1340	ND
2019-11-20	5810-900-0905	1.50 ppb
2019-11-20	5810-901-0929	1.50 ppb
2019-11-21	5810-027-1338	ND
2019-11-21	5810-033-1315	ND