Dibromochloromethane

Kent County Water Authority

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

235

Samples

Samples exceeding legal limit (MCL)

103

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.402 ppb	47	24	ND - 1.40 ppb
2015	0.397 ppb	37	9	ND - 2.80 ppb
2016	0.556 ppb	36	15	ND - 2.20 ppb
2017	0.804 ppb	43	29	ND - 3.90 ppb
2018	0.539 ppb	36	11	ND - 4.40 ppb
2019	0.689 ppb	36	15	ND - 4.30 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	1401517-01_TO02	1.20 ppb
2014-02-19	1401517-02_TO02	0.390 ppb
2014-02-19	1401517-03_TO02	1.33 ppb
2014-02-19	1401517-04_TO02	0.840 ppb
2014-02-19	1401517-05_TO02	1.40 ppb
2014-02-19	1401517-06_TO02	0.670 ppb
2014-02-19	1401517-07_TO02	0.670 ppb
2014-02-19	1401517-08_TO02	0.250 ppb
2014-03-17	1401808-05_TO12	ND
2014-03-17	1401808-02_TO12	ND
2014-03-17	1401808-03_TO12	ND
2014-03-17	1401808-04_TO12	ND
2014-04-14	1402258-01_TO02	ND
2014-04-15	1402286-01_TO02	ND
2014-04-15	1402286-02_TO02	0.500 ppb
2014-04-16	1402316-01_TO02	ND
2014-04-17	1402339-01_TO02	ND
2014-04-17	1402339-02_TO02	0.860 ppb
2014-04-18	1402359-01_TO02	ND
2014-04-21	1402378-04_TO12	ND
2014-04-21	1402378-03_TO12	ND
2014-04-21	1402378-02_TO12	ND
2014-05-14	1402678-01_TO02	0.490 ppb
2014-05-14	1402678-02_TO02	0.680 ppb
2014-05-14	1402678-04_TO02	0.580 ppb
2014-05-14	1402678-03_TO02	ND
2014-05-15	1402693-01_TO02	ND
2014-05-15	1402693-02_TO02	0.530 ppb
2014-05-15	1402693-03_TO02	ND
2014-05-15	1402693-04_TO02	ND
2014-08-13	1404415-04_TO12	ND
2014-08-14	1408-18110-001	1.000 ppb
2014-08-14	1408-18110-002	ND
2014-08-14	1408-18110-003	0.700 ppb
2014-08-14	1408-18110-004	ND
2014-08-14	1408-18110-005	ND
2014-08-14	1408-18110-006	ND
2014-08-14	1408-18110-007	ND
2014-08-14	1408-18110-008	ND
2014-11-18	1411-25894-001	0.900 ppb
2014-11-18	1411-25894-002	0.800 ppb
2014-11-18	1411-25894-003	1.10 ppb
2014-11-18	1411-25894-004	0.900 ppb
2014-11-18	1411-25894-005	1.20 ppb
2014-11-18	1411-25894-006	0.700 ppb
2014-11-18	1411-25894-007	0.700 ppb
2014-11-18	1411-25894-008	0.500 ppb
2015-02-18	1502-03356-001T	ND
2015-02-18	1502-03356-002T	ND
2015-02-18	1502-03356-003T	ND
2015-02-18	1502-03356-004T	ND
2015-02-18	1502-03356-005T	1.000 ppb
2015-02-18	1502-03356-006T	ND
2015-02-18	1502-03356-007T	ND
2015-02-18	1502-03356-008T	ND
2015-03-10	1501510-01_TO12	ND
2015-03-10	1501510-02_TO12	ND
2015-04-29	1502029-02_TO12	ND
2015-04-29	1502029-03_TO12	ND
2015-05-13	1505-08683-004	ND
2015-05-13	1505-09683-001	ND
2015-05-13	1505-09683-002	ND
2015-05-13	1505-09683-003	ND
2015-05-13	1505-09683-005	ND
2015-05-13	1505-09683-006	ND
2015-05-13	1505-09683-007	ND
2015-05-13	1505-09683-008	ND
2015-08-19	1508-17646-001	ND
2015-08-19	1508-17646-002	ND
2015-08-19	1508-17646-003	1.000 ppb
2015-08-19	1508-17646-004	ND
2015-08-19	1508-17646-005	ND
2015-08-19	1508-17646-006	ND
2015-08-19	1508-17646-007	ND
2015-08-19	1508-17646-008	ND
2015-09-14	1504119-04_TO12	ND
2015-11-17	1511-24948-001	1.80 ppb
2015-11-17	1511-24948-002	1.50 ppb
2015-11-17	1511-24948-003	1.70 ppb
2015-11-17	1511-24948-004	1.70 ppb
2015-11-17	1511-24948-005	2.80 ppb
2015-11-17	1511-24948-006	1.90 ppb
2015-11-17	1511-24948-007	1.30 ppb
2015-11-17	1511-24948-008	ND
2016-02-17	1602-03675-001	2.00 ppb
2016-02-17	1602-03675-002	ND
2016-02-17	1602-03675-003	1.20 ppb
2016-02-17	1602-03675-004	ND
2016-02-17	1602-03675-005	2.20 ppb
2016-02-17	1602-03675-006	ND
2016-02-17	1602-03675-007	1.40 ppb
2016-02-17	1602-03675-008	ND
2016-03-23	1601576-01_TO12	ND
2016-04-19	1601908-01_TO12	ND
2016-04-19	1601908-03_TO12	ND
2016-05-18	1605-11327-001	ND
2016-05-18	1605-11327-002	ND
2016-05-18	1605-11327-003	1.10 ppb
2016-05-18	1605-11327-004	ND
2016-05-18	1605-11327-005	1.30 ppb
2016-05-18	1605-11327-006	1.000 ppb
2016-05-18	1605-11327-007	ND
2016-05-18	1605-11327-008	ND
2016-07-12	1603230-02_TO12	ND
2016-08-17	1608-19347-001	ND
2016-08-17	1608-19347-002	ND
2016-08-17	1608-19347-003	ND
2016-08-17	1608-19347-004	ND
2016-08-17	1608-19347-005	ND
2016-08-17	1608-19347-006	ND
2016-08-17	1609-19347-007	ND
2016-08-17	1609-19347-008	ND
2016-11-16	1611480-01	1.60 ppb
2016-11-16	1611480-02	0.700 ppb
2016-11-16	1611480-03	1.50 ppb
2016-11-16	1611480-04	0.800 ppb
2016-11-16	1611480-05	1.60 ppb
2016-11-16	1611480-06	1.70 ppb
2016-11-16	1611480-07	1.10 ppb
2016-11-16	1611480-08	0.800 ppb
2017-02-15	1702292-01	2.10 ppb
2017-02-15	1702292-02	0.900 ppb
2017-02-15	1702292-03	2.30 ppb
2017-02-15	1702292-04	0.800 ppb
2017-02-15	1702292-05	2.60 ppb
2017-02-15	1702292-06	1.30 ppb
2017-02-15	1702292-07	1.50 ppb
2017-02-15	1702292-08	0.700 ppb
2017-03-20	1701538-01_TO12	ND
2017-04-25	1701960-04_TO12	ND
2017-04-25	1701960-01_TO12	ND
2017-05-16	1705442-01	1.10 ppb
2017-05-16	1705442-02	ND
2017-05-16	1705442-03	1.40 ppb
2017-05-16	1705442-04	0.600 ppb
2017-05-16	1705442-05	1.50 ppb
2017-05-16	1705442-06	1.000 ppb
2017-05-16	1705442-07	0.800 ppb
2017-05-16	1705442-08	ND
2017-08-16	1708376-01	0.600 ppb
2017-08-16	1708376-02	ND
2017-08-16	1708376-03	ND
2017-08-16	1708376-04	ND
2017-08-16	1708376-05	0.800 ppb
2017-08-16	1708376-06	ND
2017-08-16	1708376-07	ND
2017-08-16	1708376-08	ND
2017-08-28	1708-18567-001_T	0.690 ppb
2017-08-28	1708-18567-003_T	0.690 ppb
2017-08-28	1708-18573-001_T	ND
2017-08-28	1708-18567-002_T	0.680 ppb
2017-08-29	1708-18660-001_T	0.670 ppb
2017-08-29	1708-18660-003_T	0.670 ppb
2017-08-29	1708-18660-002_T	0.670 ppb
2017-09-05	1704240-04_TO12	ND
2017-11-21	1711626-01A	0.800 ppb
2017-11-21	1711626-02A	0.500 ppb
2017-11-21	1711626-03A	3.90 ppb
2017-11-21	1711626-04A	0.600 ppb
2017-11-21	1711626-05A	1.000 ppb
2017-11-21	1711626-06A	3.10 ppb
2017-11-21	1711626-07A	0.600 ppb
2017-11-21	1711626-08A	ND
2018-02-20	1802387-01	1.10 ppb
2018-02-20	1802387-02	ND
2018-02-20	1802387-03	4.40 ppb
2018-02-20	1802387-04	ND
2018-02-20	1802387-05	1.10 ppb
2018-02-20	1802387-06	0.900 ppb
2018-02-20	1802387-07	0.600 ppb
2018-02-20	1802387-08	ND
2018-03-23	1801470-01_TO12	ND
2018-03-23	1801470-02_TO12	ND
2018-04-19	1801795-01_TO12	ND
2018-05-16	1805426-01	0.600 ppb
2018-05-16	1805426-02	ND
2018-05-16	1805426-03	2.00 ppb
2018-05-16	1805426-04	ND
2018-05-16	1805426-05	1.10 ppb
2018-05-16	1805426-06	1.10 ppb
2018-05-16	1805426-07	ND
2018-05-16	1805426-08	ND
2018-08-15	1808405-01	ND
2018-08-15	1808405-02	ND
2018-08-15	1808405-03	4.40 ppb
2018-08-15	1808405-04	ND
2018-08-15	1808405-05	ND
2018-08-15	1808405-06	ND
2018-08-15	1808405-07	ND
2018-08-15	1808405-08	ND
2018-08-30	1803927-02_TO12	ND
2018-11-20	1811551-01	ND
2018-11-20	1811551-02	ND
2018-11-20	1811551-03	ND
2018-11-20	1811551-04	ND
2018-11-20	1811551-05	ND
2018-11-20	1811551-06	ND
2018-11-20	1811551-07	ND
2018-11-20	1811551-08	2.10 ppb
2019-02-21	1902421-01	0.700 ppb
2019-02-21	1902421-02	ND
2019-02-21	1902421-03	4.20 ppb
2019-02-21	1902421-04	0.500 ppb
2019-02-21	1902421-05	0.600 ppb
2019-02-21	1902421-06	ND
2019-02-21	1902421-07	ND
2019-02-21	1902421-08	ND
2019-03-28	1901506-01_TO12	ND
2019-03-28	1901506-02_TO12	ND
2019-04-24	1901794-03_TO12	ND
2019-05-15	1905513-01	ND
2019-05-15	1905513-02	ND
2019-05-15	1905513-03	4.30 ppb
2019-05-15	1905513-04	ND
2019-05-15	1905513-05	ND
2019-05-15	1905513-06	ND
2019-05-15	1905513-07	ND
2019-05-15	1905513-08	ND
2019-08-21	19H0686-01	0.800 ppb
2019-08-21	19H0686-02	ND
2019-08-21	19H0686-03	3.00 ppb
2019-08-21	19H0686-04	ND
2019-08-21	19H0686-05	0.600 ppb
2019-08-21	19H0686-06	ND
2019-08-21	19H0686-07	ND
2019-08-21	19H0686-08	ND
2019-09-10	1904181-01_TO12	ND
2019-11-20	19K0605-01	3.10 ppb
2019-11-20	19K0605-02	0.600 ppb
2019-11-20	19K0605-03	2.80 ppb
2019-11-20	19K0605-04	0.500 ppb
2019-11-20	19K0605-05	1.30 ppb
2019-11-20	19K0605-06	0.800 ppb
2019-11-20	19K0605-07	1.000 ppb
2019-11-20	19K0605-08	ND