Bromodichloromethane

Ramsey Water Department

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

216

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	2.73 ppb	40	16	ND - 12.0 ppb
2015	5.43 ppb	26	18	ND - 12.6 ppb
2016	3.01 ppb	38	16	ND - 13.0 ppb
2017	3.94 ppb	41	16	ND - 17.5 ppb
2018	5.00 ppb	35	16	ND - 18.8 ppb
2019	5.63 ppb	36	16	ND - 21.0 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
2014-01-07	24919-11	ND
2014-01-07	24919-9	ND
2014-02-12	25456-21	3.30 ppb
2014-02-12	25456-20	3.46 ppb
2014-02-12	25456-19	3.34 ppb
2014-02-12	25456-18	3.29 ppb
2014-03-04	25674-11	ND
2014-04-09	26199-11	ND
2014-04-09	26199-9	ND
2014-05-12	26666-14	7.46 ppb
2014-05-12	26666-13	9.26 ppb
2014-05-12	26666-12	8.12 ppb
2014-05-12	26666-11	5.56 ppb
2014-05-12	26666-20	ND
2014-05-12	26666-22	ND
2014-05-12	26666-17	ND
2014-05-19	26781-10	ND
2014-05-19	26781-13	ND
2014-05-19	26781-11	ND
2014-05-19	26781-12	ND
2014-06-18	27338-11	ND
2014-06-18	27338-9	ND
2014-06-25	27435-19	ND
2014-07-17	27886-11	ND
2014-07-17	27886-9	ND
2014-08-11	28209-4	8.70 ppb
2014-08-11	28209-3	12.0 ppb
2014-08-11	28209-2	11.4 ppb
2014-08-11	28209-1	10.2 ppb
2014-09-17	28891-11	ND
2014-09-17	28891-9	ND
2014-10-06	29268-11	ND
2014-10-06	29268-9	ND
2014-11-10	29791-12	4.23 ppb
2014-11-10	29791-11	7.25 ppb
2014-11-10	29791-10	8.04 ppb
2014-11-10	29791-9	3.50 ppb
2014-11-10	29791-8	ND
2014-11-10	29791-6	ND
2014-11-10	29791-3	ND
2015-01-13	30764-9	ND
2015-02-11	31208-4	4.14 ppb
2015-02-11	31208-3	2.47 ppb
2015-02-11	31208-2	2.80 ppb
2015-02-11	31208-1	2.33 ppb
2015-04-13	DWS166-9	ND
2015-04-20	DWS247-2	2.41 ppb
2015-04-20	DWS247-4	2.48 ppb
2015-05-11	DWS510-4	9.03 ppb
2015-05-11	DWS510-3	11.7 ppb
2015-05-11	DWS510-2	10.5 ppb
2015-05-11	DWS510-1	9.29 ppb
2015-07-14	DWSC34-11	ND
2015-07-14	DWSC34-9	ND
2015-08-11	DWSC183-4	11.6 ppb
2015-08-11	DWSC183-3	12.6 ppb
2015-08-11	DWSC183-2	12.6 ppb
2015-08-11	DWSC183-1	6.89 ppb
2015-10-08	DWSC573-3	ND
2015-10-08	DWSC573-1	ND
2015-11-16	DWSC774-4	9.65 ppb
2015-11-16	DWSC774-3	10.4 ppb
2015-11-16	DWSC774-2	10.5 ppb
2015-11-16	DWSC774-1	9.76 ppb
2015-11-16	DWSC777-3	ND
2015-12-15	DWSC921-9	ND
2016-01-06	DWSC986-9	ND
2016-02-11	DWSC1128-4	4.97 ppb
2016-02-11	DWSC1128-3	5.52 ppb
2016-02-11	DWSC1128-2	5.34 ppb
2016-02-11	DWSC1128-1	4.96 ppb
2016-02-25	DWSC1176-8	ND
2016-03-15	DWSC1282-9	ND
2016-04-12	DWSC1408-16	ND
2016-05-16	DWSC1545-4	5.96 ppb
2016-05-16	DWSC1545-3	7.25 ppb
2016-05-16	DWSC1545-2	7.04 ppb
2016-05-16	DWSC1545-1	4.72 ppb
2016-05-17	DWSC1548-22	ND
2016-05-17	DWSC1548-19	ND
2016-06-07	DWSC1635-3	ND
2016-06-07	DWSC1635-1	ND
2016-07-13	DWSC1811-9	ND
2016-07-14	DWSC1824-1	ND
2016-08-15	DWSC1958-4	10.3 ppb
2016-08-15	DWSC1958-3	12.6 ppb
2016-08-15	DWSC1958-2	13.0 ppb
2016-08-15	DWSC1958-1	13.0 ppb
2016-08-23	DWSC2000-10	ND
2016-08-23	DWSC1999-1	ND
2016-09-07	DWSC2050-8	ND
2016-09-07	DWSC2050-6	ND
2016-09-07	DWSC2050-3	ND
2016-10-05	DWSC2196-3	ND
2016-10-05	DWSC2196-1	ND
2016-11-14	DWSC2363-14	ND
2016-11-14	DWSC2363-15	ND
2016-11-14	DWSC2363-12	ND
2016-11-15	DWSC2370-12	4.14 ppb
2016-11-15	DWSC2370-11	6.15 ppb
2016-11-15	DWSC2370-10	5.98 ppb
2016-11-15	DWSC2370-9	3.55 ppb
2016-12-05	DWSC2445-11	ND
2016-12-05	DWSC2445-9	ND
2017-01-09	DWSC2587-9	ND
2017-02-13	DWSC2694-4	7.29 ppb
2017-02-13	DWSC2694-3	5.04 ppb
2017-02-13	DWSC2694-2	4.28 ppb
2017-02-13	DWSC2694-1	2.74 ppb
2017-02-13	DWSC2693-3	ND
2017-04-03	DWSC2911-17	ND
2017-05-03	DWSC3048-6	ND
2017-05-03	DWSC3048-3	ND
2017-05-10	DWSC3102-4	12.7 ppb
2017-05-10	DWSC3102-3	9.41 ppb
2017-05-10	DWSC3102-2	3.70 ppb
2017-05-10	DWSC3102-1	4.82 ppb
2017-05-24	DWSC3190-2	ND
2017-05-24	DWSC3190-3	ND
2017-05-24	DWSC3190-4	ND
2017-05-24	DWSC3190-5	ND
2017-05-24	DWSC3190-1	ND
2017-06-12	DWSC3284-3	ND
2017-06-12	DWSC3284-1	ND
2017-07-10	DWSC3454-2	ND
2017-07-10	DWSC3454-1	ND
2017-08-14	DWSC3676-4	14.1 ppb
2017-08-14	DWSC3676-3	16.2 ppb
2017-08-14	DWSC3676-2	13.8 ppb
2017-08-14	DWSC3676-1	17.5 ppb
2017-08-14	DWSC3675-6	ND
2017-08-14	DWSC3675-4	ND
2017-08-14	DWSC3675-2	ND
2017-09-05	DWSC3824-2	ND
2017-09-05	DWSC3824-1	ND
2017-10-03	DWSC4026-3	ND
2017-10-03	DWSC4026-1	ND
2017-11-06	DWSC4205-7	ND
2017-11-06	DWSC4205-5	ND
2017-11-06	DWSC4205-2	ND
2017-11-13	DWSC4257-4	10.7 ppb
2017-11-13	DWSC4257-3	12.6 ppb
2017-11-13	DWSC4257-2	11.4 ppb
2017-11-13	DWSC4257-1	15.4 ppb
2017-12-05	DWSC4370-9	ND
2018-01-22	DWSC4635-9	ND
2018-02-06	DWSC4707-1	ND
2018-02-12	DWSC4738-4	4.30 ppb
2018-02-12	DWSC4738-3	3.97 ppb
2018-02-12	DWSC4738-2	3.53 ppb
2018-02-12	DWSC4738-1	7.60 ppb
2018-03-06	DWSC4871-1	ND
2018-04-09	DWSC5063-9	ND
2018-05-14	DWSC5300-4	10.7 ppb
2018-05-14	DWSC5300-3	9.58 ppb
2018-05-14	DWSC5300-2	5.84 ppb
2018-05-14	DWSC5300-1	9.30 ppb
2018-05-21	DWSC5356-6	ND
2018-05-21	DWSC5356-8	ND
2018-05-21	DWSC5356-3	ND
2018-06-04	DWSC5419-2	ND
2018-06-04	DWSC5419-1	ND
2018-07-09	18070948-02	ND
2018-07-09	18070948-01	ND
2018-08-13	18081407-04	13.8 ppb
2018-08-13	18081407-03	12.9 ppb
2018-08-13	18081407-02	14.1 ppb
2018-08-13	18081407-01	18.8 ppb
2018-08-13	18081408-08	ND
2018-08-13	18081408-06	ND
2018-08-13	18081408-03	ND
2018-09-04	18090406-03	ND
2018-09-04	18090406-01	ND
2018-10-02	18100309-09	ND
2018-11-13	18111406-04	17.0 ppb
2018-11-13	18111406-03	18.0 ppb
2018-11-13	18111406-02	17.7 ppb
2018-11-13	18111406-01	7.71 ppb
2018-11-13	18111405-03	ND
2018-12-03	18120405-09	ND
2019-01-08	19010901-01	ND
2019-02-11	19021404-04	9.10 ppb
2019-02-11	19021404-03	8.67 ppb
2019-02-11	19021404-02	8.80 ppb
2019-02-11	19021404-01	7.45 ppb
2019-02-13	19021402-01	ND
2019-03-05	19030605-01	ND
2019-04-02	19040212-01	ND
2019-05-13	3033895004	15.8 ppb
2019-05-13	3033895003	15.2 ppb
2019-05-13	3033895002	21.0 ppb
2019-05-13	3033895001	11.1 ppb
2019-05-14	19051501-02	ND
2019-06-18	19061804-003	ND
2019-06-18	19061804-007	ND
2019-07-09	19071204-002	ND
2019-07-09	19071204-001	ND
2019-08-06	19080701-008	ND
2019-08-06	19080701-006	ND
2019-08-06	19080701-003	ND
2019-08-12	19081215-004	14.5 ppb
2019-08-12	19081215-003	19.2 ppb
2019-08-12	19081215-002	18.3 ppb
2019-08-12	19081215-001	16.5 ppb
2019-09-10	19091343-002	ND
2019-09-10	19091343-001	ND
2019-10-08	19101001-002	ND
2019-10-08	19101001-001	ND
2019-10-22	19102302-003	ND
2019-10-22	19102302-001	ND
2019-11-05	19110604-001	ND
2019-11-12	19111216-004	9.94 ppb
2019-11-12	19111216-003	10.2 ppb
2019-11-12	19111216-002	9.67 ppb
2019-11-12	19111216-001	7.22 ppb
2019-12-05	19120608-001	ND