Bromoform

City of Chino Hills

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

172

Samples

Samples exceeding legal limit (MCL)

137

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	11.8 ppb	19	17	ND - 17.0 ppb
2015	8.10 ppb	32	31	ND - 18.0 ppb
2016	10.4 ppb	27	24	ND - 35.0 ppb
2017	1.01 ppb	36	11	ND - 5.30 ppb
2018	10.3 ppb	24	22	ND - 26.0 ppb
2019	6.61 ppb	34	32	ND - 14.0 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
2014-01-23	4790-001-1300	ND
2014-01-23	4790-017-1330	ND
2014-05-22	4790-601-1005	16.0 ppb
2014-05-22	4790-602-0910	13.0 ppb
2014-05-22	4790-603-1450	15.0 ppb
2014-05-22	4790-604-1020	16.0 ppb
2014-05-22	4790-605-0930	17.0 ppb
2014-05-22	4790-606-1515	17.0 ppb
2014-05-22	4790-607-0950	15.0 ppb
2014-05-22	4790-608-1035	14.0 ppb
2014-08-12	4790-601-1000	12.0 ppb
2014-08-12	4790-602-0855	11.0 ppb
2014-08-12	4790-603-1200	13.0 ppb
2014-08-12	4790-604-1020	12.0 ppb
2014-08-12	4790-605-0920	10.00 ppb
2014-08-12	4790-606-1050	9.90 ppb
2014-08-12	4790-607-0935	13.0 ppb
2014-08-12	4790-608-1035	12.0 ppb
2014-11-13	4790-601-1020	7.80 ppb
2015-02-19	4790-601-1115	18.0 ppb
2015-02-19	4790-602-1200	9.90 ppb
2015-02-19	4790-603-0915	16.0 ppb
2015-02-19	4790-604-1045	15.0 ppb
2015-02-19	4790-605-1130	17.0 ppb
2015-02-19	4790-606-0845	12.0 ppb
2015-02-19	4790-607-1030	18.0 ppb
2015-02-19	4790-608-1100	16.0 ppb
2015-05-21	4790-601-1000	0.760 ppb
2015-05-21	4790-602-0830	ND
2015-05-21	4790-603-1050	0.820 ppb
2015-05-21	4790-604-0915	0.720 ppb
2015-05-21	4790-605-1015	0.910 ppb
2015-05-21	4790-606-0930	1.20 ppb
2015-05-21	4790-607-1030	0.630 ppb
2015-05-21	4790-608-0900	2.80 ppb
2015-08-27	4790-601-1045	6.90 ppb
2015-08-27	4790-602-0935	7.30 ppb
2015-08-27	4790-603-0810	7.00 ppb
2015-08-27	4790-604-1125	7.30 ppb
2015-08-27	4790-605-1010	6.90 ppb
2015-08-27	4790-606-0830	6.80 ppb
2015-08-27	4790-607-0850	5.90 ppb
2015-08-27	4790-608-1030	6.90 ppb
2015-11-17	4790-601-1040	13.0 ppb
2015-11-17	4790-602-1020	7.50 ppb
2015-11-17	4790-603-1220	7.70 ppb
2015-11-17	4790-604-1115	9.20 ppb
2015-11-17	4790-605-1000	9.40 ppb
2015-11-17	4790-606-1150	10.00 ppb
2015-11-17	4790-607-0945	8.50 ppb
2015-11-17	4790-608-1105	9.30 ppb
2016-02-23	4790-601-1000	13.0 ppb
2016-03-03	4790-014-1130	ND
2016-03-03	4790-024-1030	ND
2016-05-26	4790-601-1145	5.40 ppb
2016-05-26	4790-602-1445	5.00 ppb
2016-05-26	4790-603-0845	5.60 ppb
2016-05-26	4790-604-0950	5.60 ppb
2016-05-26	4790-605-1110	6.10 ppb
2016-05-26	4790-606-1240	5.10 ppb
2016-05-26	4790-607-1130	5.50 ppb
2016-05-26	4790-608-1040	5.80 ppb
2016-08-25	9588-601-1225	8.80 ppb
2016-08-25	9588-602-1320	8.00 ppb
2016-08-25	9588-603-1410	5.30 ppb
2016-08-25	9588-604-1200	8.70 ppb
2016-08-25	9588-605-1255	8.10 ppb
2016-08-25	9588-606-1130	9.00 ppb
2016-08-25	9588-607-1240	9.20 ppb
2016-08-25	9588-608-1145	9.40 ppb
2016-12-15	9588-601-1030	18.0 ppb
2016-12-15	9588-602-1220	35.0 ppb
2016-12-15	9588-603-0915	ND
2016-12-15	9588-604-1000	22.0 ppb
2016-12-15	9588-605-1105	25.0 ppb
2016-12-15	9588-606-0940	23.0 ppb
2016-12-15	9588-607-1055	13.0 ppb
2016-12-15	9588-608-0950	21.0 ppb
2017-02-16	9588-001-1010	ND
2017-02-16	9588-017-1040	ND
2017-02-23	9588-601-0925	2.20 ppb
2017-02-23	9588-602-0850	1.20 ppb
2017-02-23	9588-603-1300	ND
2017-02-23	9588-604-1040	ND
2017-02-23	9588-605-0910	ND
2017-02-23	9588-606-1125	ND
2017-02-23	9588-607-1020	ND
2017-02-23	9588-608-1100	ND
2017-04-19	9588-009-1030	ND
2017-04-19	9588-010-0945	ND
2017-05-26	9588-601-0950	ND
2017-05-26	9588-602-0840	ND
2017-05-26	9588-603-1215	ND
2017-05-26	9588-604-1015	ND
2017-05-26	9588-605-0920	ND
2017-05-26	9588-606-1140	ND
2017-05-26	9588-607-0935	ND
2017-05-26	9588-608-1030	ND
2017-08-23	9588-601-1040	ND
2017-08-23	9588-602-1220	ND
2017-08-23	9588-603-0845	ND
2017-08-23	9588-604-0950	ND
2017-08-23	9588-605-1100	ND
2017-08-23	9588-606-0915	1.20 ppb
2017-08-23	9588-607-1010	ND
2017-08-23	9588-608-0935	1.000 ppb
2017-11-15	9588-601-0930	4.70 ppb
2017-11-15	9588-602-1040	4.50 ppb
2017-11-15	9588-603-0800	ND
2017-11-15	9588-604-0900	4.70 ppb
2017-11-15	9588-605-1005	4.90 ppb
2017-11-15	9588-606-0830	4.30 ppb
2017-11-15	9588-607-0955	2.30 ppb
2017-11-15	9588-608-0845	5.30 ppb
2018-05-30	9588-601-1345	5.70 ppb
2018-05-30	9588-602-1410	5.10 ppb
2018-05-30	9588-603-1055	ND
2018-05-30	9588-604-1330	5.70 ppb
2018-05-30	9588-605-1025	4.60 ppb
2018-05-30	9588-606-0920	4.80 ppb
2018-05-30	9588-607-1040	5.50 ppb
2018-05-30	9588-608-1000	6.30 ppb
2018-08-28	4790-601-1330	7.20 ppb
2018-08-28	4790-602-1355	8.60 ppb
2018-08-28	4790-603-0925	ND
2018-08-28	4790-604-1320	7.70 ppb
2018-08-28	4790-605-1110	7.90 ppb
2018-08-28	4790-606-0945	8.80 ppb
2018-08-28	4790-607-1130	7.80 ppb
2018-08-28	4790-608-1050	7.90 ppb
2018-12-21	4790-601-0945	16.0 ppb
2018-12-21	4790-602-0910	23.0 ppb
2018-12-21	4790-603-1050	13.0 ppb
2018-12-21	4790-604-1005	20.0 ppb
2018-12-21	4790-605-0935	26.0 ppb
2018-12-21	4790-606-1030	19.0 ppb
2018-12-21	4790-607-0955	17.0 ppb
2018-12-21	4790-608-1015	19.0 ppb
2019-02-26	9588-601-0940	7.80 ppb
2019-02-26	9588-602-1310	8.90 ppb
2019-02-26	9588-603-1115	6.50 ppb
2019-02-26	9588-604-1015	9.30 ppb
2019-02-26	9588-605-0920	14.0 ppb
2019-02-26	9588-606-1055	9.90 ppb
2019-02-26	9588-607-0900	9.60 ppb
2019-02-26	9588-608-1040	11.0 ppb
2019-06-18	4790-601-1220	7.80 ppb
2019-06-18	4790-602-1250	7.40 ppb
2019-06-18	4790-603-1030	6.30 ppb
2019-06-18	4790-604-1335	8.80 ppb
2019-06-18	4790-605-1055	7.10 ppb
2019-06-18	4790-606-1400	6.60 ppb
2019-06-18	4790-607-1045	7.80 ppb
2019-06-18	4790-608-1345	3.20 ppb
2019-08-28	4790-601-1120	5.40 ppb
2019-08-28	4790-602-1005	4.80 ppb
2019-08-28	4790-603-0915	1.80 ppb
2019-08-28	4790-604-1135	4.70 ppb
2019-08-28	4790-605-1030	2.20 ppb
2019-08-28	4790-606-1215	4.50 ppb
2019-08-28	4790-607-1105	4.80 ppb
2019-08-28	4790-608-1155	2.50 ppb
2019-11-20	4790-601-1115	7.80 ppb
2019-11-20	4790-602-1300	6.80 ppb
2019-11-20	4790-603-1000	7.40 ppb
2019-11-20	4790-604-1055	7.80 ppb
2019-11-20	4790-605-1215	8.40 ppb
2019-11-20	4790-606-1025	7.90 ppb
2019-11-20	4790-607-1130	8.00 ppb
2019-11-20	4790-608-1040	7.90 ppb
2019-11-26	4790-014-0820	ND
2019-11-26	4790-024-1000	ND