Monochlorobenzene (chlorobenzene)

Colorado Springs Utilities

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	5	ND
2015	ND	5	ND
2016	ND	7	ND
2017	ND	6	ND
2018	ND	8	ND
2019	ND	6	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	Result
2014-05-13	ND
2014-05-13	ND
2014-05-13	ND
2014-05-13	ND
2014-05-13	ND
2015-05-05	ND
2015-05-05	ND
2015-05-05	ND
2015-05-05	ND
2015-05-05	ND
2016-05-09	ND
2016-05-09	ND
2016-05-10	ND
2016-05-10	ND
2016-05-25	ND
2016-07-06	ND
2016-10-03	ND
2017-01-04	ND
2017-04-04	ND
2017-04-05	ND
2017-04-05	ND
2017-09-11	ND
2017-10-03	ND
2018-01-10	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-12	ND
2018-08-01	ND
2018-10-03	ND
2019-01-09	ND
2019-05-16	ND
2019-06-05	ND
2019-06-07	ND
2019-06-07	ND
2019-06-17	ND