Monochlorobenzene (chlorobenzene)

City of Atwater

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
2013	N/A	0	N/A
2014	ND	4	ND
2015	N/A	0	N/A
2016	ND	8	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	8	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
2014-03-12	5806-903-0910	ND
2014-03-12	5806-902-0935	ND
2014-03-12	5806-901-0815	ND
2014-03-12	5806-900-0735	ND
2016-03-23	5806-018-0900	ND
2016-03-23	5806-021-1000	ND
2016-03-23	5806-019-0930	ND
2016-03-23	5806-013-0630	ND
2016-03-23	5806-017-0830	ND
2016-03-23	5806-016-0800	ND
2016-03-23	5806-015-0730	ND
2016-03-23	5806-014-0700	ND
2019-02-27	5806-017-0730	ND
2019-02-27	5806-016-1020	ND
2019-02-27	5806-018-0820	ND
2019-02-27	5806-019-0855	ND
2019-02-27	5806-015-0650	ND
2019-02-27	5806-021-1155	ND
2019-02-27	5806-014-1130	ND
2019-02-27	5806-013-1100	ND