Dibromochloromethane

City of Las Vegas

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.

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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	ND	16	0	ND
2015	0.352 ppb	16	8	ND - 1.01 ppb
2016	0.675 ppb	16	11	ND - 1.28 ppb
2017	1.44 ppb	16	12	ND - 3.76 ppb
2018	3.21 ppb	16	16	1.18 ppb - 7.06 ppb
2019	1.92 ppb	8	7	ND - 3.18 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
2014-02-12	1402511-001A	ND
2014-02-12	1402509-001A	ND
2014-02-12	1402522-001A	ND
2014-02-13	1402524-001A	ND
2014-05-22	1405A52-001A	ND
2014-05-22	1405A56-001A	ND
2014-05-22	1405A54-001A	ND
2014-05-22	1405A48-001A	ND
2014-08-20	1408B25-001A	ND
2014-08-20	1408B27-001A	ND
2014-08-20	1408B26-001A	ND
2014-08-20	1408B28-001A	ND
2014-11-17	1411808-001A	ND
2014-11-17	1411686-001A	ND
2014-11-17	1411797-001A	ND
2014-11-17	1411795-001A	ND
2015-02-19	1502891-001A	ND
2015-02-19	1502888-001A	ND
2015-02-19	1502886-001A	ND
2015-02-19	1502894-001A	ND
2015-05-21	1505A33-001A	ND
2015-05-21	1505A38-001A	ND
2015-05-21	1505A40-001A	ND
2015-05-21	1505A34-001A	0.538 ppb
2015-07-16	2015021106	0.750 ppb
2015-07-16	2015021107	0.690 ppb
2015-07-16	2015021108	0.640 ppb
2015-07-16	2015021105	0.770 ppb
2015-12-03	1512231-001A	1.01 ppb
2015-12-03	1512228-001A	0.738 ppb
2015-12-03	1512229-001A	0.503 ppb
2015-12-03	1512226-001A	ND
2016-02-17	1602826-001A	0.690 ppb
2016-02-17	1602829-001A	ND
2016-02-17	1602831-001A	0.713 ppb
2016-02-17	1602833-001A	0.986 ppb
2016-05-19	1605976-001A	ND
2016-05-19	1605978-001A	ND
2016-05-19	1605977-001A	ND
2016-05-19	1605973-001A	ND
2016-08-10	1608767-001A	1.28 ppb
2016-08-10	1608766-001A	1.07 ppb
2016-08-10	1608765-001A	0.970 ppb
2016-08-10	1608761-001A	0.784 ppb
2016-11-17	1611A69-001	0.970 ppb
2016-11-17	1611A71-001	1.16 ppb
2016-11-17	1611A73-001	1.09 ppb
2016-11-17	1611A72-001	1.08 ppb
2017-02-15	1702886-001	0.714 ppb
2017-02-15	1702883-001	0.639 ppb
2017-02-15	1702885-001	0.546 ppb
2017-02-15	1702884-001	ND
2017-05-22	1705E17-001	0.558 ppb
2017-05-22	1705E18-001	ND
2017-05-22	1705E16-001	ND
2017-05-22	1705E15-001	ND
2017-08-23	1708G00-001	3.76 ppb
2017-08-23	1708F96-001	2.95 ppb
2017-08-23	1708F97-001	3.14 ppb
2017-08-23	1708F98-001	3.76 ppb
2017-11-08	1711562-001	3.45 ppb
2017-11-08	1711556-001	1.47 ppb
2017-11-08	1711559-001	1.38 ppb
2017-11-08	1711546-001	0.629 ppb
2018-02-08	1802637-001	1.27 ppb
2018-02-08	1802636-001	1.54 ppb
2018-02-08	1802635-001	1.47 ppb
2018-02-08	1802634-001	1.67 ppb
2018-05-10	1805720-001	3.00 ppb
2018-05-10	1805719-001	3.73 ppb
2018-05-10	1805718-001	2.91 ppb
2018-05-10	1805717-001	3.10 ppb
2018-08-08	1808702-001	6.71 ppb
2018-08-08	1808704-001	4.97 ppb
2018-08-08	1808705-001	7.06 ppb
2018-08-08	1808706-001	5.54 ppb
2018-11-01	1811117-001	1.18 ppb
2018-11-01	1811119-001	2.48 ppb
2018-11-01	1811121-001	2.76 ppb
2018-11-01	1811124-001	1.90 ppb
2019-08-08	1908655-001	1.20 ppb
2019-08-08	1908657-001	1.06 ppb
2019-08-08	1908656-001	1.21 ppb
2019-08-08	1908653-001	ND
2019-11-13	1911638-001	3.14 ppb
2019-11-13	1911630-001	3.18 ppb
2019-11-13	1911609-001	3.07 ppb
2019-11-13	1911608-001	2.52 ppb