Bromoform

City of Carlsbad

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

182

Samples

Samples exceeding legal limit (MCL)

154

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	2.46 ppb	32	32	1.20 ppb - 6.00 ppb
2015	1.63 ppb	32	28	ND - 3.00 ppb
2016	1.49 ppb	32	26	ND - 3.20 ppb
2017	3.04 ppb	30	25	ND - 9.00 ppb
2018	2.46 ppb	32	30	ND - 14.0 ppb
2019	1.31 ppb	24	13	ND - 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
2014-02-12	2706-901-1346	1.30 ppb
2014-02-12	2706-902-1410	1.40 ppb
2014-02-12	2706-903-1351	1.50 ppb
2014-02-12	2706-904-1219	1.50 ppb
2014-02-12	2706-904-1308	1.50 ppb
2014-02-12	2706-905-1245	1.40 ppb
2014-02-12	2706-906-1326	1.50 ppb
2014-02-12	2706-907-1316	1.30 ppb
2014-05-14	2706-900-0917	1.50 ppb
2014-05-14	2706-901-1024	1.40 ppb
2014-05-14	2706-903-1047	1.40 ppb
2014-05-14	2706-905-0845	1.60 ppb
2014-05-14	2706-906-0955	1.60 ppb
2014-05-14	2706-907-0936	1.60 ppb
2014-05-15	2706-902-1019	1.20 ppb
2014-05-15	2706-904-0845	1.30 ppb
2014-08-15	2706-900-1409	6.00 ppb
2014-08-15	2706-901-1451	6.00 ppb
2014-08-15	2706-902-1515	4.90 ppb
2014-08-15	2706-903-1502	5.60 ppb
2014-08-15	2706-904-1337	5.10 ppb
2014-08-15	2706-905-1558	5.40 ppb
2014-08-15	2706-906-1432	5.40 ppb
2014-08-15	2706-907-1420	5.90 ppb
2014-11-04	2706-900-0848	1.50 ppb
2014-11-04	2706-901-0941	1.60 ppb
2014-11-04	2706-902-1021	1.30 ppb
2014-11-04	2706-903-1002	1.30 ppb
2014-11-04	2706-904-0733	1.50 ppb
2014-11-04	2706-905-0800	1.30 ppb
2014-11-04	2706-906-0919	1.50 ppb
2014-11-04	2706-907-0902	1.50 ppb
2015-02-10	2706-900-1353	1.60 ppb
2015-02-10	2706-901-1325	1.70 ppb
2015-02-10	2706-902-1408	1.50 ppb
2015-02-10	2706-903-1450	1.60 ppb
2015-02-10	2706-904-1141	1.70 ppb
2015-02-10	2706-905-1252	1.80 ppb
2015-02-10	2706-906-1310	2.00 ppb
2015-02-10	2706-907-1334	1.60 ppb
2015-05-13	2706-900-1109	2.80 ppb
2015-05-13	2706-901-1134	2.60 ppb
2015-05-13	2706-902-1209	2.80 ppb
2015-05-13	2706-903-1151	3.00 ppb
2015-05-13	2706-904-1011	2.00 ppb
2015-05-13	2706-905-1036	2.40 ppb
2015-05-13	2706-906-1051	2.70 ppb
2015-05-13	2706-907-1121	2.50 ppb
2015-08-25	2706-900-0945	1.80 ppb
2015-08-25	2706-901-1015	1.60 ppb
2015-08-25	2706-902-1048	1.20 ppb
2015-08-25	2706-903-1033	1.20 ppb
2015-08-25	2706-904-0735	1.30 ppb
2015-08-25	2706-905-0810	1.50 ppb
2015-08-25	2706-906-0920	1.40 ppb
2015-08-25	2706-907-0955	1.90 ppb
2015-11-17	2706-900-1258	1.70 ppb
2015-11-17	2706-901-1338	1.60 ppb
2015-11-17	2706-904-1110	ND
2015-11-17	2706-905-1159	ND
2015-11-17	2706-906-1242	ND
2015-11-17	2706-907-1313	1.60 ppb
2015-11-18	2706-902-0930	ND
2015-11-18	2706-903-0903	1.20 ppb
2016-02-03	2706-900-0942	ND
2016-02-03	2706-901-1120	ND
2016-02-03	2706-902-1230	1.10 ppb
2016-02-03	2706-903-1144	1.10 ppb
2016-02-03	2706-904-0825	ND
2016-02-03	2706-905-0856	ND
2016-02-03	2706-906-0921	1.000 ppb
2016-02-03	2706-907-1005	1.000 ppb
2016-05-09	2706-900-0906	2.40 ppb
2016-05-09	2706-901-0953	2.20 ppb
2016-05-09	2706-902-1040	1.70 ppb
2016-05-09	2706-903-1015	3.10 ppb
2016-05-09	2706-904-0757	ND
2016-05-09	2706-905-0821	1.80 ppb
2016-05-09	2706-906-0853	2.60 ppb
2016-05-09	2706-907-0927	2.40 ppb
2016-08-09	2706-900-1302	2.20 ppb
2016-08-09	2706-901-1412	2.40 ppb
2016-08-09	2706-902-1507	2.40 ppb
2016-08-09	2706-903-1435	3.20 ppb
2016-08-09	2706-904-1125	1.50 ppb
2016-08-09	2706-905-1146	1.50 ppb
2016-08-09	2706-906-1352	1.70 ppb
2016-08-09	2706-907-1331	2.10 ppb
2016-11-08	2706-900-1424	1.40 ppb
2016-11-08	2706-901-1508	1.50 ppb
2016-11-08	2706-902-1457	1.30 ppb
2016-11-08	2706-903-1522	2.40 ppb
2016-11-08	2706-904-1548	1.000 ppb
2016-11-08	2706-905-1348	ND
2016-11-08	2706-906-1410	1.30 ppb
2016-11-08	2706-907-1440	1.30 ppb
2017-02-21	2706-900-1504	8.30 ppb
2017-02-21	2706-901-1425	6.60 ppb
2017-02-21	2706-902-1350	5.40 ppb
2017-02-21	2706-903-1410	6.20 ppb
2017-02-21	2706-904-1332	7.00 ppb
2017-02-21	2706-906-1527	9.00 ppb
2017-02-21	2706-907-1448	4.60 ppb
2017-05-10	2706-900-0954	1.30 ppb
2017-05-10	2706-901-1045	2.70 ppb
2017-05-10	2706-902-1121	ND
2017-05-10	2706-903-1105	ND
2017-05-10	2706-904-0805	ND
2017-05-10	2706-905-0839	ND
2017-05-10	2706-906-1020	ND
2017-05-10	2706-907-1005	2.40 ppb
2017-08-17	2706-900-1155	2.30 ppb
2017-08-17	2706-901-1021	3.10 ppb
2017-08-17	2706-902-1054	2.60 ppb
2017-08-17	2706-903-1000	2.70 ppb
2017-08-17	2706-904-0926	2.30 ppb
2017-08-17	2706-905-0900	1.80 ppb
2017-08-17	2706-906-1122	2.50 ppb
2017-08-17	2706-907-1140	2.40 ppb
2017-11-06	2706-900-1339	4.50 ppb
2017-11-06	2706-901-1128	2.40 ppb
2017-11-06	2706-902-1400	2.00 ppb
2017-11-06	2706-903-1002	2.80 ppb
2017-11-06	2706-904-1218	2.20 ppb
2017-11-06	2706-906-1318	2.00 ppb
2017-11-06	2706-907-1153	2.10 ppb
2018-02-12	2706-900-1004	14.0 ppb
2018-02-12	2706-901-1100	2.00 ppb
2018-02-12	2706-902-1148	2.20 ppb
2018-02-12	2706-903-1127	2.30 ppb
2018-02-12	2706-904-0904	ND
2018-02-12	2706-905-0833	ND
2018-02-12	2706-906-0944	1.70 ppb
2018-02-12	2706-907-1035	12.0 ppb
2018-05-10	2706-900-0959	1.50 ppb
2018-05-10	2706-901-1109	1.10 ppb
2018-05-10	2706-902-0126	1.30 ppb
2018-05-10	2706-903-1132	2.30 ppb
2018-05-10	2706-904-0824	1.50 ppb
2018-05-10	2706-905-0205	1.50 ppb
2018-05-10	2706-906-0932	1.20 ppb
2018-05-10	2706-907-1030	1.30 ppb
2018-08-16	2706-900-0931	2.20 ppb
2018-08-16	2706-901-1019	2.30 ppb
2018-08-16	2706-902-1056	2.30 ppb
2018-08-16	2706-903-1038	2.30 ppb
2018-08-16	2706-904-0830	1.70 ppb
2018-08-16	2706-905-0848	1.80 ppb
2018-08-16	2706-906-0910	2.10 ppb
2018-08-16	2706-907-0942	2.00 ppb
2018-11-26	2706-900-1125	1.40 ppb
2018-11-26	2706-901-1303	1.60 ppb
2018-11-26	2706-902-1328	1.50 ppb
2018-11-26	2706-903-1240	4.60 ppb
2018-11-26	2706-904-0952	1.80 ppb
2018-11-26	2706-905-1025	1.80 ppb
2018-11-26	2706-906-1058	1.70 ppb
2018-11-26	2706-907-1400	1.80 ppb
2019-02-12	2706-900-1015	ND
2019-02-12	2706-901-1107	ND
2019-02-12	2706-902-1151	ND
2019-02-12	2706-903-1129	2.50 ppb
2019-02-12	2706-904-0828	1.10 ppb
2019-02-12	2706-905-0904	1.000 ppb
2019-02-12	2706-906-0940	1.10 ppb
2019-02-12	2706-907-1033	ND
2019-05-10	2706-900-0835	ND
2019-05-10	2706-901-0911	ND
2019-05-10	2706-902-0945	ND
2019-05-10	2706-903-0926	2.50 ppb
2019-05-10	2706-904-0732	ND
2019-05-10	2706-905-0753	ND
2019-05-10	2706-906-0821	ND
2019-05-10	2706-907-0843	ND
2019-08-06	2706-900-1351	2.60 ppb
2019-08-06	2706-901-1250	2.70 ppb
2019-08-06	2706-902-1200	3.10 ppb
2019-08-06	2706-903-1224	3.10 ppb
2019-08-06	2706-904-1135	2.80 ppb
2019-08-06	2706-905-1432	2.60 ppb
2019-08-06	2706-906-1409	3.60 ppb
2019-08-06	2706-907-1330	2.80 ppb