Monochlorobenzene (chlorobenzene)

Santa Clara Valley Water District

Monochlorobenzene is used as a solvent for pesticides, a degreasing agent and an intermediate for manufacturing other chemicals. It causes liver and kidney damage in studies of laboratory animals.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	15	ND
2015	ND	21	ND
2016	ND	14	ND
2017	ND	12	ND
2018	ND	18	ND
2019	ND	18	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 70 ppb

The EWG Health Guideline of 70 ppb for monochlorobenzene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for monochlorobenzene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1960s.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-11	2400-005-0920	ND
2014-02-11	2400-011-0815	ND
2014-02-11	2400-007-1015	ND
2014-05-20	2400-011-0945	ND
2014-05-20	2400-007-1059	ND
2014-05-20	2400-005-1202	ND
2014-08-12	2400-011-0901	ND
2014-08-12	2400-007-1010	ND
2014-08-12	2400-005-1021	ND
2014-11-04	2400-007-0916	ND
2014-11-12	2400-024-1103	ND
2014-11-12	2400-023-0949	ND
2014-11-12	2400-022-1030	ND
2014-12-02	2400-011-0926	ND
2014-12-02	2400-005-1036	ND
2015-02-23	2400-023-1100	ND
2015-02-23	2400-022-1200	ND
2015-02-24	2400-011-0835	ND
2015-02-24	2400-007-1008	ND
2015-02-24	2400-005-0950	ND
2015-02-25	2400-024-1130	ND
2015-05-18	2400-024-0920	ND
2015-05-18	2400-023-0855	ND
2015-05-18	2400-022-0950	ND
2015-05-19	2400-011-0818	ND
2015-05-19	2400-005-0935	ND
2015-05-19	2400-007-0928	ND
2015-08-18	2400-022-1030	ND
2015-08-18	2400-005-0956	ND
2015-08-18	2400-007-1045	ND
2015-08-18	2400-024-0930	ND
2015-08-18	2400-011-0835	ND
2015-09-21	2400-023-1105	ND
2015-11-17	2400-005-0954	ND
2015-11-17	2400-007-0844	ND
2015-11-17	2400-011-0816	ND
2016-02-23	2400-005-0930	ND
2016-02-23	2400-007-0932	ND
2016-02-23	2400-011-0800	ND
2016-05-17	2400-011-0813	ND
2016-05-17	2400-007-0939	ND
2016-05-17	2400-005-0937	ND
2016-07-20	2400-024-0958	ND
2016-07-20	2400-023-0947	ND
2016-07-20	2400-022-1021	ND
2016-08-16	2400-011-0810	ND
2016-08-16	2400-007-1035	ND
2016-08-18	2400-005-1545	ND
2016-11-15	2400-007-0922	ND
2016-11-15	2400-011-0758	ND
2017-02-21	2400-007-0953	ND
2017-02-28	2400-011-0725	ND
2017-05-16	2400-007-0950	ND
2017-05-16	2400-011-0845	ND
2017-05-17	2400-022-1117	ND
2017-05-17	2400-024-1048	ND
2017-05-17	2400-023-1023	ND
2017-08-22	2400-005-1140	ND
2017-08-22	2400-007-1038	ND
2017-08-22	2400-011-0943	ND
2017-11-14	2400-007-0734	ND
2017-11-14	2400-005-0900	ND
2018-02-20	2400-005-0958	ND
2018-02-20	2400-007-0845	ND
2018-03-27	2400-011-0833	ND
2018-05-14	2400-022-0926	ND
2018-05-14	2400-024-1015	ND
2018-05-14	2400-023-0944	ND
2018-05-15	2400-005-0848	ND
2018-05-15	2400-011-1713	ND
2018-05-15	2400-007-1250	ND
2018-08-21	2400-011-0935	ND
2018-08-21	2400-005-1304	ND
2018-08-21	2400-007-1125	ND
2018-08-22	2400-023-1448	ND
2018-08-22	2400-024-1017	ND
2018-08-22	2400-022-1055	ND
2018-11-06	2400-005-1025	ND
2018-11-06	2400-007-1033	ND
2018-11-06	2400-011-0920	ND
2019-02-19	2400-007-0950	ND
2019-02-19	2400-011-0728	ND
2019-02-19	2400-005-0835	ND
2019-05-21	2400-007-1049	ND
2019-05-21	2400-005-1030	ND
2019-05-21	2400-011-0851	ND
2019-05-22	2400-024-1140	ND
2019-05-22	2400-023-1032	ND
2019-05-22	2400-022-1228	ND
2019-08-20	2400-005-0825	ND
2019-08-20	2400-007-0955	ND
2019-08-20	2400-011-0654	ND
2019-11-19	2400-005-1045	ND
2019-11-19	2400-011-0926	ND
2019-11-19	2400-007-1207	ND
2019-11-20	2400-024-1036	ND
2019-11-20	2400-023-1000	ND
2019-11-20	2400-022-1115	ND