Bromoform

Lafayette Utilities Water System

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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

302

Samples

Samples exceeding legal limit (MCL)

250

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	0.824 ppb	50	26	ND - 2.40 ppb
2015	1.50 ppb	48	48	1.000 ppb - 2.30 ppb
2016	1.41 ppb	60	56	ND - 4.00 ppb
2017	1.92 ppb	48	44	ND - 11.1 ppb
2018	0.975 ppb	48	28	ND - 3.90 ppb
2019	1.30 ppb	48	48	0.700 ppb - 3.60 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-01-10	L0038767-02	ND
2014-01-10	L0038767-03	ND
2014-01-10	L0038767-04	2.40 ppb
2014-01-10	L0038767-05	ND
2014-01-10	L0038767-06	2.40 ppb
2014-01-10	L0038767-02	ND
2014-01-10	L0038767-03	ND
2014-01-10	L0038767-04	2.40 ppb
2014-01-10	L0038767-05	ND
2014-01-10	L0038767-06	2.40 ppb
2014-01-11	L0038767-01	ND
2014-01-11	L0038767-01	ND
2014-04-07	L0041834-01	1.40 ppb
2014-04-07	L0041834-02	1.70 ppb
2014-04-07	L0041834-03	1.90 ppb
2014-04-07	L0041834-04	1.000 ppb
2014-04-07	L0041834-05	2.30 ppb
2014-04-07	L0041834-06	ND
2014-04-07	L0041834-01	1.40 ppb
2014-04-07	L0041834-02	1.70 ppb
2014-04-07	L0041834-03	1.90 ppb
2014-04-07	L0041834-04	1.000 ppb
2014-04-07	L0041834-05	2.30 ppb
2014-04-07	L0041834-06	ND
2014-07-09	L0045422-01	1.000 ppb
2014-07-09	L0045422-02	1.30 ppb
2014-07-09	L0045422-03	1.20 ppb
2014-07-09	L0045422-04	ND
2014-07-09	L0045422-05	ND
2014-07-09	L0045422-06	ND
2014-07-09	L0045422-01	1.000 ppb
2014-07-09	L0045422-02	1.30 ppb
2014-07-09	L0045422-03	1.20 ppb
2014-07-09	L0045422-04	ND
2014-07-09	L0045422-05	ND
2014-07-09	L0045422-06	ND
2014-10-10	L0049360-01	1.50 ppb
2014-10-10	L0049360-02	1.30 ppb
2014-10-10	L0049360-03	ND
2014-10-10	L0049360-05	ND
2014-10-10	L0049360-06	ND
2014-10-10	L0049360-01	1.50 ppb
2014-10-10	L0049360-02	1.30 ppb
2014-10-10	L0049360-03	ND
2014-10-10	L0049360-05	ND
2014-10-10	L0049360-06	ND
2014-10-11	L0049360-04	1.20 ppb
2014-10-11	L0049360-04	1.20 ppb
2014-11-03	AD99281	ND
2014-11-03	AD99281	ND
2015-01-09	L0052948-01	1.20 ppb
2015-01-09	L0052948-04	1.000 ppb
2015-01-09	L0052948-06	1.10 ppb
2015-01-09	L0052948-01	1.20 ppb
2015-01-09	L0052948-04	1.000 ppb
2015-01-09	L0052948-06	1.10 ppb
2015-01-10	L0052948-02	1.10 ppb
2015-01-10	L0052948-03	1.40 ppb
2015-01-10	L0052948-05	1.30 ppb
2015-01-10	L0052948-02	1.10 ppb
2015-01-10	L0052948-03	1.40 ppb
2015-01-10	L0052948-05	1.30 ppb
2015-04-10	LA5900-3	1.70 ppb
2015-04-10	LA5900-4	1.60 ppb
2015-04-10	LA5900-5	2.10 ppb
2015-04-10	LA5900-6	1.40 ppb
2015-04-10	LA5900-3	1.70 ppb
2015-04-10	LA5900-4	1.60 ppb
2015-04-10	LA5900-5	2.10 ppb
2015-04-10	LA5900-6	1.40 ppb
2015-04-11	LA5900-1	1.30 ppb
2015-04-11	LA5900-2	1.60 ppb
2015-04-11	LA5900-1	1.30 ppb
2015-04-11	LA5900-2	1.60 ppb
2015-07-14	LA9484-1	1.80 ppb
2015-07-14	LA9484-2	1.50 ppb
2015-07-14	LA9484-3	2.00 ppb
2015-07-14	LA9484-4	2.30 ppb
2015-07-14	LA9484-5	1.10 ppb
2015-07-14	LA9484-6	1.50 ppb
2015-07-14	LA9484-1	1.80 ppb
2015-07-14	LA9484-2	1.50 ppb
2015-07-14	LA9484-3	2.00 ppb
2015-07-14	LA9484-4	2.30 ppb
2015-07-14	LA9484-5	1.10 ppb
2015-07-14	LA9484-6	1.50 ppb
2015-10-12	LA12747-1	1.80 ppb
2015-10-12	LA12747-2	1.80 ppb
2015-10-12	LA12747-3	1.80 ppb
2015-10-12	LA12747-4	1.10 ppb
2015-10-12	LA12747-5	1.10 ppb
2015-10-12	LA12747-6	1.40 ppb
2015-10-12	LA12747-1	1.80 ppb
2015-10-12	LA12747-2	1.80 ppb
2015-10-12	LA12747-3	1.80 ppb
2015-10-12	LA12747-4	1.10 ppb
2015-10-12	LA12747-5	1.10 ppb
2015-10-12	LA12747-6	1.40 ppb
2016-01-11	LA16317-1	1.20 ppb
2016-01-11	LA16317-2	1.60 ppb
2016-01-11	LA16317-3	1.70 ppb
2016-01-11	LA16317-4	1.40 ppb
2016-01-11	LA16317-5	1.30 ppb
2016-01-11	LA16317-6	0.960 ppb
2016-01-11	LA16317-1	1.20 ppb
2016-01-11	LA16317-2	1.60 ppb
2016-01-11	LA16317-3	1.70 ppb
2016-01-11	LA16317-4	1.40 ppb
2016-01-11	LA16317-5	1.30 ppb
2016-01-11	LA16317-6	0.960 ppb
2016-02-03	LA16927-1	1.40 ppb
2016-02-03	LA16927-2	1.50 ppb
2016-02-03	LA16927-3	1.80 ppb
2016-02-03	LA16927-4	1.30 ppb
2016-02-03	LA16927-5	1.60 ppb
2016-02-03	LA16927-6	1.40 ppb
2016-02-03	LA16927-1	1.40 ppb
2016-02-03	LA16927-2	1.50 ppb
2016-02-03	LA16927-3	1.80 ppb
2016-02-03	LA16927-4	1.30 ppb
2016-02-03	LA16927-5	1.60 ppb
2016-02-03	LA16927-6	1.40 ppb
2016-04-11	LA19308-1	1.80 ppb
2016-04-11	LA19308-2	1.50 ppb
2016-04-11	LA19308-3	1.50 ppb
2016-04-11	LA19308-4	1.50 ppb
2016-04-11	LA19308-5	1.20 ppb
2016-04-11	LA19308-6	1.40 ppb
2016-04-11	LA19308-1	1.80 ppb
2016-04-11	LA19308-2	1.50 ppb
2016-04-11	LA19308-3	1.50 ppb
2016-04-11	LA19308-4	1.50 ppb
2016-04-11	LA19308-5	1.20 ppb
2016-04-11	LA19308-6	1.40 ppb
2016-07-12	LA22986-1	1.30 ppb
2016-07-12	LA22986-2	1.40 ppb
2016-07-12	LA22986-3	1.60 ppb
2016-07-12	LA22986-4	1.10 ppb
2016-07-12	LA22986-5	4.00 ppb
2016-07-12	LA22986-6	0.900 ppb
2016-07-12	LA22986-1	1.30 ppb
2016-07-12	LA22986-2	1.40 ppb
2016-07-12	LA22986-3	1.60 ppb
2016-07-12	LA22986-4	1.10 ppb
2016-07-12	LA22986-5	4.00 ppb
2016-07-12	LA22986-6	0.900 ppb
2016-10-12	LA26681-1	ND
2016-10-12	LA26681-2	1.10 ppb
2016-10-12	LA26681-3	1.70 ppb
2016-10-12	LA26681-4	1.20 ppb
2016-10-12	LA26681-5	2.00 ppb
2016-10-12	LA26681-6	ND
2016-10-12	LA26681-1	ND
2016-10-12	LA26681-2	1.10 ppb
2016-10-12	LA26681-3	1.70 ppb
2016-10-12	LA26681-4	1.20 ppb
2016-10-12	LA26681-5	2.00 ppb
2016-10-12	LA26681-6	ND
2017-01-12	35289032001	ND
2017-01-12	35289032002	1.40 ppb
2017-01-12	35289032003	1.70 ppb
2017-01-12	35289032004	1.20 ppb
2017-01-12	35289032001	ND
2017-01-12	35289032002	1.40 ppb
2017-01-12	35289032003	1.70 ppb
2017-01-12	35289032004	1.20 ppb
2017-01-13	35289034001	1.000 ppb
2017-01-13	35289034002	ND
2017-01-13	35289034001	1.000 ppb
2017-01-13	35289034002	ND
2017-04-13	35306502001	0.960 ppb
2017-04-13	35306502002	1.60 ppb
2017-04-13	35306502003	1.10 ppb
2017-04-13	35306502004	1.000 ppb
2017-04-13	35306502005	3.20 ppb
2017-04-13	35306502006	1.10 ppb
2017-04-13	35306502001	0.960 ppb
2017-04-13	35306502002	1.60 ppb
2017-04-13	35306502003	1.10 ppb
2017-04-13	35306502004	1.000 ppb
2017-04-13	35306502005	3.20 ppb
2017-04-13	35306502006	1.10 ppb
2017-07-13	35324177015	1.50 ppb
2017-07-13	35324177016	1.70 ppb
2017-07-13	35324177017	1.20 ppb
2017-07-13	35324177018	0.840 ppb
2017-07-13	35324177019	11.1 ppb
2017-07-13	35324177020	0.850 ppb
2017-07-13	35324177015	1.50 ppb
2017-07-13	35324177016	1.70 ppb
2017-07-13	35324177017	1.20 ppb
2017-07-13	35324177018	0.840 ppb
2017-07-13	35324177019	11.1 ppb
2017-07-13	35324177020	0.850 ppb
2017-10-06	35340512001	1.10 ppb
2017-10-06	35340512002	1.70 ppb
2017-10-06	35340512003	1.50 ppb
2017-10-06	35340512004	1.40 ppb
2017-10-06	35340512005	7.70 ppb
2017-10-06	35340512006	1.20 ppb
2017-10-06	35340512001	1.10 ppb
2017-10-06	35340512002	1.70 ppb
2017-10-06	35340512003	1.50 ppb
2017-10-06	35340512004	1.40 ppb
2017-10-06	35340512005	7.70 ppb
2017-10-06	35340512006	1.20 ppb
2018-01-12	35368396001	ND
2018-01-12	35368396002	1.80 ppb
2018-01-12	35368396003	ND
2018-01-12	35368396004	1.10 ppb
2018-01-12	35368396005	1.20 ppb
2018-01-12	35368396006	1.20 ppb
2018-01-12	35368396001	ND
2018-01-12	35368396002	1.80 ppb
2018-01-12	35368396003	ND
2018-01-12	35368396004	1.10 ppb
2018-01-12	35368396005	1.20 ppb
2018-01-12	35368396006	1.20 ppb
2018-04-05	35384677001	1.30 ppb
2018-04-05	35384677002	ND
2018-04-05	35384677003	ND
2018-04-05	35384677004	ND
2018-04-05	35384677005	ND
2018-04-05	35384677006	1.10 ppb
2018-04-05	35384677001	1.30 ppb
2018-04-05	35384677002	ND
2018-04-05	35384677003	ND
2018-04-05	35384677004	ND
2018-04-05	35384677005	ND
2018-04-05	35384677006	1.10 ppb
2018-07-31	35407898001	1.60 ppb
2018-07-31	35407898002	2.00 ppb
2018-07-31	35407898003	1.20 ppb
2018-07-31	35407898004	1.60 ppb
2018-07-31	35407898005	2.10 ppb
2018-07-31	35407898006	1.20 ppb
2018-07-31	35407898001	1.60 ppb
2018-07-31	35407898002	2.00 ppb
2018-07-31	35407898003	1.20 ppb
2018-07-31	35407898004	1.60 ppb
2018-07-31	35407898005	2.10 ppb
2018-07-31	35407898006	1.20 ppb
2018-10-18	35425428001	ND
2018-10-18	35425428002	2.10 ppb
2018-10-18	35425428003	ND
2018-10-18	35425428004	ND
2018-10-18	35425428005	3.90 ppb
2018-10-18	35425428006	ND
2018-10-18	35425428001	ND
2018-10-18	35425428002	2.10 ppb
2018-10-18	35425428003	ND
2018-10-18	35425428004	ND
2018-10-18	35425428005	3.90 ppb
2018-10-18	35425428006	ND
2019-01-10	35441863001	0.750 ppb
2019-01-10	35441863002	1.50 ppb
2019-01-10	35441863003	1.10 ppb
2019-01-10	35441863004	0.700 ppb
2019-01-10	35441863005	1.40 ppb
2019-01-10	35441863006	0.780 ppb
2019-01-10	35441863001	0.750 ppb
2019-01-10	35441863002	1.50 ppb
2019-01-10	35441863003	1.10 ppb
2019-01-10	35441863004	0.700 ppb
2019-01-10	35441863005	1.40 ppb
2019-01-10	35441863006	0.780 ppb
2019-04-11	35461551001	0.770 ppb
2019-04-11	35461551002	1.60 ppb
2019-04-11	35461551003	1.20 ppb
2019-04-11	35461551004	0.970 ppb
2019-04-11	35461551005	1.000 ppb
2019-04-11	35461551006	0.980 ppb
2019-04-11	35461551001	0.770 ppb
2019-04-11	35461551002	1.60 ppb
2019-04-11	35461551003	1.20 ppb
2019-04-11	35461551004	0.970 ppb
2019-04-11	35461551005	1.000 ppb
2019-04-11	35461551006	0.980 ppb
2019-07-19	35483795001	1.30 ppb
2019-07-19	35483795002	1.70 ppb
2019-07-19	35483795003	1.10 ppb
2019-07-19	35483795004	0.940 ppb
2019-07-19	35483795005	3.60 ppb
2019-07-19	35483795006	1.10 ppb
2019-07-19	35483795001	1.30 ppb
2019-07-19	35483795002	1.70 ppb
2019-07-19	35483795003	1.10 ppb
2019-07-19	35483795004	0.940 ppb
2019-07-19	35483795005	3.60 ppb
2019-07-19	35483795006	1.10 ppb
2019-10-18	35506260001	0.970 ppb
2019-10-18	35506260002	1.60 ppb
2019-10-18	35506260003	1.30 ppb
2019-10-18	35506260004	0.810 ppb
2019-10-18	35506260005	3.20 ppb
2019-10-18	35506260006	0.860 ppb
2019-10-18	35506260001	0.970 ppb
2019-10-18	35506260002	1.60 ppb
2019-10-18	35506260003	1.30 ppb
2019-10-18	35506260004	0.810 ppb
2019-10-18	35506260005	3.20 ppb
2019-10-18	35506260006	0.860 ppb