Bromoform

City of Sunnyvale

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

204

Samples

Samples exceeding legal limit (MCL)

122

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	11.1 ppb	32	25	ND - 30.2 ppb
2015	7.86 ppb	38	24	ND - 20.3 ppb
2016	5.58 ppb	32	24	ND - 22.4 ppb
2017	0.931 ppb	32	15	ND - 3.30 ppb
2018	2.79 ppb	38	20	ND - 8.14 ppb
2019	2.61 ppb	32	14	ND - 14.2 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
2014-03-05	1431-900-1045	23.4 ppb
2014-03-05	1431-901-0815	27.0 ppb
2014-03-05	1431-902-0738	0.600 ppb
2014-03-05	1431-903-1033	26.8 ppb
2014-03-05	1431-904-1110	28.0 ppb
2014-03-05	1431-905-1100	30.2 ppb
2014-03-05	1431-906-1020	9.80 ppb
2014-03-05	1431-907-0715	ND
2014-05-14	1431-900-1228	8.20 ppb
2014-05-14	1431-901-1140	0.600 ppb
2014-05-14	1431-902-1106	1.60 ppb
2014-05-14	1431-903-1218	9.62 ppb
2014-05-14	1431-904-1251	10.9 ppb
2014-05-14	1431-905-1242	10.1 ppb
2014-05-14	1431-906-1205	4.60 ppb
2014-05-14	1431-907-1054	ND
2014-08-06	1431-900-1115	12.9 ppb
2014-08-06	1431-901-1020	ND
2014-08-06	1431-902-0950	ND
2014-08-06	1431-903-1100	14.7 ppb
2014-08-06	1431-904-1145	14.9 ppb
2014-08-06	1431-905-1125	14.0 ppb
2014-08-06	1431-906-1045	15.3 ppb
2014-08-06	1431-907-0920	ND
2014-11-12	1431-900-0955	16.3 ppb
2014-11-12	1431-901-0925	18.0 ppb
2014-11-12	1431-902-0908	ND
2014-11-12	1431-903-0945	17.9 ppb
2014-11-12	1431-904-1041	18.1 ppb
2014-11-12	1431-905-1017	18.7 ppb
2014-11-12	1431-906-1056	3.30 ppb
2014-11-12	1431-907-0850	ND
2015-02-11	5810-003-1046	ND
2015-02-11	5810-004-1105	ND
2015-02-11	5810-007-0945	ND
2015-02-11	5810-010-1140	ND
2015-02-11	5810-012-1205	ND
2015-03-10	1431-900-1052	14.6 ppb
2015-03-10	1431-901-1005	16.8 ppb
2015-03-10	1431-902-0955	ND
2015-03-10	1431-903-1025	17.1 ppb
2015-03-10	1431-904-1120	18.1 ppb
2015-03-10	1431-905-1113	17.4 ppb
2015-03-10	1431-906-1038	15.3 ppb
2015-03-10	1431-907-0930	ND
2015-05-05	1431-900-1025	5.50 ppb
2015-05-05	1431-901-1152	6.70 ppb
2015-05-05	1431-902-1210	ND
2015-05-05	1431-903-1050	5.00 ppb
2015-05-05	1431-904-1303	6.30 ppb
2015-05-05	1431-905-1150	6.20 ppb
2015-05-05	1431-906-1110	3.80 ppb
2015-05-05	1431-907-1235	ND
2015-08-19	1431-900-1235	12.2 ppb
2015-08-19	1431-901-1130	12.9 ppb
2015-08-19	1431-902-1035	ND
2015-08-19	1431-903-1210	12.7 ppb
2015-08-19	1431-904-1300	11.2 ppb
2015-08-19	1431-905-1245	11.1 ppb
2015-08-19	1431-906-1155	0.900 ppb
2015-08-19	1431-907-1010	ND
2015-10-28	5810-008-1002	ND
2015-10-28	1431-900-1208	18.5 ppb
2015-10-28	1431-901-0901	20.1 ppb
2015-10-28	1431-902-0845	ND
2015-10-28	1431-903-1035	20.3 ppb
2015-10-28	1431-904-1225	18.1 ppb
2015-10-28	1431-905-1217	17.5 ppb
2015-10-28	1431-906-1047	10.3 ppb
2015-10-28	1431-907-0825	ND
2016-03-02	1431-900-1035	3.20 ppb
2016-03-02	1431-901-0843	1.60 ppb
2016-03-02	1431-902-0915	ND
2016-03-02	1431-903-1020	3.40 ppb
2016-03-02	1431-904-1100	2.50 ppb
2016-03-02	1431-905-1045	3.80 ppb
2016-03-02	1431-906-0940	ND
2016-03-02	1431-907-0810	ND
2016-05-04	1431-900-1020	7.40 ppb
2016-05-04	1431-901-0930	8.00 ppb
2016-05-04	1431-902-0912	1.70 ppb
2016-05-04	1431-903-1005	7.37 ppb
2016-05-04	1431-904-1050	7.50 ppb
2016-05-04	1431-905-1050	7.30 ppb
2016-05-04	1431-906-0955	1.20 ppb
2016-05-04	1431-907-0900	ND
2016-08-10	1431-900-0900	4.90 ppb
2016-08-10	1431-901-1010	5.20 ppb
2016-08-10	1431-902-1110	ND
2016-08-10	1431-903-0920	5.80 ppb
2016-08-10	1431-904-0810	4.63 ppb
2016-08-10	1431-905-0827	4.70 ppb
2016-08-10	1431-906-0938	0.600 ppb
2016-08-10	1431-907-1040	ND
2016-10-12	1431-900-1020	17.9 ppb
2016-10-12	1431-901-0920	22.4 ppb
2016-10-12	1431-902-0849	ND
2016-10-12	1431-903-0945	20.6 ppb
2016-10-12	1431-904-1100	18.5 ppb
2016-10-12	1431-905-1035	17.4 ppb
2016-10-12	1431-906-1005	0.800 ppb
2016-10-12	1431-907-0825	ND
2017-02-15	1431-900-0840	1.50 ppb
2017-02-15	1431-901-0955	ND
2017-02-15	1431-902-1050	ND
2017-02-15	1431-903-0900	2.30 ppb
2017-02-15	1431-904-1000	0.900 ppb
2017-02-15	1431-905-0825	2.50 ppb
2017-02-15	1431-906-0915	3.20 ppb
2017-02-15	1431-907-1020	ND
2017-05-24	1431-900-1100	1.000 ppb
2017-05-24	1431-901-0950	1.000 ppb
2017-05-24	1431-902-0935	ND
2017-05-24	1431-903-1050	1.20 ppb
2017-05-24	1431-904-1130	0.900 ppb
2017-05-24	1431-905-1115	0.900 ppb
2017-05-24	1431-906-1031	ND
2017-05-24	1431-907-0915	ND
2017-08-23	1431-900-1130	3.10 ppb
2017-08-23	1431-901-1025	3.00 ppb
2017-08-23	1431-902-1000	ND
2017-08-23	1431-903-1115	3.30 ppb
2017-08-23	1431-904-1155	1.78 ppb
2017-08-23	1431-905-1145	3.20 ppb
2017-08-23	1431-906-1055	ND
2017-08-23	1431-907-0940	ND
2017-11-15	1431-900-0955	ND
2017-11-15	1431-901-1055	ND
2017-11-15	1431-902-1120	ND
2017-11-15	1431-903-1010	ND
2017-11-15	1431-904-0915	ND
2017-11-15	1431-905-0935	ND
2017-11-15	1431-906-1025	ND
2017-11-15	1431-907-1145	ND
2018-02-21	1431-900-1005	3.26 ppb
2018-02-21	1431-901-1047	ND
2018-02-21	1431-902-1104	ND
2018-02-21	1431-904-0955	3.94 ppb
2018-02-21	1431-905-0930	4.16 ppb
2018-02-21	1431-907-1117	ND
2018-02-28	1431-903-0936	3.49 ppb
2018-02-28	1431-906-0948	ND
2018-03-14	5810-003-1050	ND
2018-03-14	5810-004-1115	ND
2018-03-14	5810-007-0905	ND
2018-03-14	5810-008-0810	ND
2018-03-14	5810-010-0935	ND
2018-03-14	5810-012-1027	ND
2018-05-09	1431-900-0938	6.29 ppb
2018-05-09	1431-901-0906	8.14 ppb
2018-05-09	1431-902-0850	ND
2018-05-09	1431-903-0928	4.81 ppb
2018-05-09	1431-904-1010	6.91 ppb
2018-05-09	1431-905-0947	6.70 ppb
2018-05-09	1431-906-1030	ND
2018-05-09	1431-907-0835	ND
2018-08-15	1431-900-0935	4.21 ppb
2018-08-15	1431-901-1016	4.55 ppb
2018-08-15	1431-902-1035	ND
2018-08-15	1431-903-1002	3.73 ppb
2018-08-15	1431-904-0930	4.19 ppb
2018-08-15	1431-905-0908	3.71 ppb
2018-08-15	1431-906-0948	ND
2018-08-15	1431-907-1050	ND
2018-11-14	1431-900-1005	7.14 ppb
2018-11-14	1431-901-0916	7.49 ppb
2018-11-14	1431-902-0900	ND
2018-11-14	1431-903-0939	7.87 ppb
2018-11-14	1431-904-1030	7.19 ppb
2018-11-14	1431-905-1012	6.60 ppb
2018-11-14	1431-906-0947	1.67 ppb
2018-11-14	1431-907-0830	ND
2019-01-30	1431-900-1020	11.9 ppb
2019-01-30	1431-901-0910	8.26 ppb
2019-01-30	1431-902-0848	1.97 ppb
2019-01-30	1431-903-0945	13.0 ppb
2019-01-30	1431-904-1050	5.02 ppb
2019-01-30	1431-905-1035	14.2 ppb
2019-01-30	1431-906-1000	7.55 ppb
2019-01-30	1431-907-0835	ND
2019-05-22	1431-900-0915	3.66 ppb
2019-05-22	1431-901-0845	ND
2019-05-22	1431-902-0830	ND
2019-05-22	1431-903-0950	4.24 ppb
2019-05-22	1431-904-0935	6.66 ppb
2019-05-22	1431-905-0925	2.70 ppb
2019-05-22	1431-906-1005	2.96 ppb
2019-05-22	1431-907-0810	ND
2019-09-11	1431-900-0910	ND
2019-09-11	1431-901-0835	ND
2019-09-11	1431-902-0820	ND
2019-09-11	1431-903-0955	0.530 ppb
2019-09-11	1431-904-0940	ND
2019-09-11	1431-905-0930	ND
2019-09-11	1431-906-1010	ND
2019-09-11	1431-907-0800	ND
2019-11-20	1431-900-0915	ND
2019-11-20	1431-901-0850	ND
2019-11-20	1431-902-0815	ND
2019-11-20	1431-903-0948	ND
2019-11-20	1431-904-0933	0.950 ppb
2019-11-20	1431-905-0920	ND
2019-11-20	1431-906-0958	ND
2019-11-20	1431-907-0830	ND