Bromodichloromethane

City of Hollister

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

121

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	1.97 ppb	16	7	ND - 22.5 ppb
2015	3.26 ppb	16	16	1.88 ppb - 4.95 ppb
2016	2.06 ppb	21	13	ND - 5.63 ppb
2017	4.09 ppb	16	12	ND - 11.4 ppb
2018	6.03 ppb	20	18	ND - 16.4 ppb
2019	4.28 ppb	32	31	ND - 13.5 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
2014-03-24	1610-801-1710	22.5 ppb
2014-03-24	1610-802-1615	0.640 ppb
2014-03-24	1610-803-1555	1.26 ppb
2014-03-24	1610-804-1650	2.12 ppb
2014-06-06	1610-801-1445	ND
2014-06-06	1610-802-1520	0.590 ppb
2014-06-06	1610-803-1540	ND
2014-06-06	1610-804-1458	ND
2014-10-09	1610-801-1150	ND
2014-10-09	1610-802-1100	ND
2014-10-09	1610-803-1130	ND
2014-10-09	1610-804-1205	ND
2014-12-18	1610-801-1235	2.26 ppb
2014-12-18	1610-802-1255	ND
2014-12-18	1610-803-1310	ND
2014-12-18	1610-804-1220	2.11 ppb
2015-04-21	1610-801-1350	3.49 ppb
2015-04-21	1610-802-1321	2.21 ppb
2015-04-21	1610-803-1328	2.15 ppb
2015-04-21	1610-804-1341	4.15 ppb
2015-07-09	1610-801-1008	4.29 ppb
2015-07-09	1610-802-0843	4.95 ppb
2015-07-09	1610-803-0903	4.40 ppb
2015-07-09	1610-804-0954	4.30 ppb
2015-09-16	1610-801-1440	2.36 ppb
2015-09-16	1610-802-1344	1.96 ppb
2015-09-16	1610-803-1359	1.88 ppb
2015-09-16	1610-804-1422	3.22 ppb
2015-11-12	1610-801-0840	3.47 ppb
2015-11-12	1610-802-0920	2.66 ppb
2015-11-12	1610-803-0932	2.86 ppb
2015-11-12	1610-804-0858	3.81 ppb
2016-03-03	1610-801-0913	5.26 ppb
2016-03-03	1610-802-0817	2.97 ppb
2016-03-03	1610-803-0829	3.80 ppb
2016-03-03	1610-804-0856	5.63 ppb
2016-06-14	1610-801-1442	ND
2016-06-14	1610-802-1428	ND
2016-06-14	1610-803-1421	ND
2016-06-14	1610-804-1523	ND
2016-06-29	1610-804-1123	2.97 ppb
2016-07-07	1610-804-1237	3.07 ppb
2016-07-14	1610-804-1245	ND
2016-07-21	1610-804-1015	ND
2016-08-04	1610-804-1320	ND
2016-09-22	1610-801-1155	2.22 ppb
2016-09-22	1610-802-1110	2.48 ppb
2016-09-22	1610-803-1100	2.28 ppb
2016-09-22	1610-804-1205	2.24 ppb
2016-12-14	1610-801-1309	3.25 ppb
2016-12-14	1610-802-1251	3.39 ppb
2016-12-14	1610-803-1237	3.60 ppb
2016-12-14	1610-804-1316	ND
2017-03-01	1610-801-1150	4.70 ppb
2017-03-01	1610-802-1202	3.48 ppb
2017-03-01	1610-803-1209	3.57 ppb
2017-03-01	1610-804-1141	4.97 ppb
2017-06-01	1610-801-1245	ND
2017-06-01	1610-802-1159	3.56 ppb
2017-06-01	1610-803-1210	1.79 ppb
2017-06-01	1610-804-1226	ND
2017-09-07	1610-801-1148	ND
2017-09-07	1610-802-1202	3.00 ppb
2017-09-07	1610-803-1208	4.73 ppb
2017-09-07	1610-804-1142	ND
2017-12-07	1610-801-0914	11.4 ppb
2017-12-07	1610-802-0934	6.96 ppb
2017-12-07	1610-803-0926	7.60 ppb
2017-12-07	1610-804-0905	9.74 ppb
2018-03-08	1610-801-1148	3.65 ppb
2018-03-08	1610-802-1109	ND
2018-03-08	1610-803-1120	1.36 ppb
2018-03-08	1610-804-1136	4.01 ppb
2018-06-07	1610-801-0937	5.57 ppb
2018-06-07	1610-802-0910	2.83 ppb
2018-06-07	1610-803-0900	2.74 ppb
2018-06-07	1610-804-0925	6.48 ppb
2018-09-06	1610-801-1108	16.4 ppb
2018-09-06	1610-802-1045	11.1 ppb
2018-09-06	1610-803-1050	9.88 ppb
2018-09-06	1610-804-1105	15.9 ppb
2018-12-06	1610-801-1224	12.8 ppb
2018-12-06	1610-802-1145	4.34 ppb
2018-12-06	1610-803-1135	5.48 ppb
2018-12-06	1610-804-1243	7.47 ppb
2018-12-06	1610-805-1311	3.53 ppb
2018-12-06	1610-806-1117	4.46 ppb
2018-12-06	1610-808-1031	2.60 ppb
2018-12-06	1610-809-1040	ND
2019-03-14	1610-801-1025	4.54 ppb
2019-03-14	1610-802-1040	4.53 ppb
2019-03-14	1610-803-1050	4.76 ppb
2019-03-14	1610-804-1010	4.20 ppb
2019-03-14	1610-805-1115	3.59 ppb
2019-03-14	1610-806-1100	4.37 ppb
2019-03-14	1610-808-1130	4.16 ppb
2019-03-14	1610-809-1150	ND
2019-06-06	1610-801-0945	4.82 ppb
2019-06-06	1610-802-0923	4.31 ppb
2019-06-06	1610-803-0914	3.93 ppb
2019-06-06	1610-804-0936	4.85 ppb
2019-06-06	1610-805-0850	1.24 ppb
2019-06-06	1610-806-0904	4.98 ppb
2019-06-06	1610-808-0829	2.97 ppb
2019-06-06	1610-810-0820	2.60 ppb
2019-09-10	1610-801-1017	13.5 ppb
2019-09-10	1610-802-1006	3.52 ppb
2019-09-10	1610-803-1000	5.96 ppb
2019-09-10	1610-804-1025	9.08 ppb
2019-09-10	1610-805-1046	1.54 ppb
2019-09-10	1610-806-1109	4.25 ppb
2019-09-10	1610-808-1130	5.21 ppb
2019-09-10	1610-810-1124	3.62 ppb
2019-12-05	1610-801-1051	4.36 ppb
2019-12-05	1610-802-1125	4.38 ppb
2019-12-05	1610-803-1135	3.45 ppb
2019-12-05	1610-804-1109	6.51 ppb
2019-12-05	1610-805-1203	2.36 ppb
2019-12-05	1610-806-1010	4.22 ppb
2019-12-05	1610-808-0939	2.53 ppb
2019-12-05	1610-810-0925	2.81 ppb