Inorganic Contaminants	Synthetic Organic Compounds	Volatile Organic Compounds
None	None	Benzene Carbon Tetrachloride Para-Dichlorobenzene Trichloroethylene Vinyl Chloride 1,1,2 - Trichloroethane 1,1 - Dichloroethylene 1,2 - Dichloroethane

The Phase I Rule became effective on January 9, 1989. This rule, also called the Volatile Organic Chemical Rule, or VOC Rule, set water quality standards for 8 VOCs and required all community and Non-Transient, Non-Community water systems to monitor for and, if necessary, treat their supplies for these chemicals. VOC monitoring requirements for Phase I VOCs were synchronized under the Standardized Monitoring Framework, a monitoring framework established by Phase II in January 1, 1991. Monitoring under this framework started in January 1, 1993.

VOCs are among the most widely used chemicals. There are usually found in ground water, where they may remain for long periods of time. VOCs have been found in about 20 percent of the nation's water supplies.

Monitoring Requirements

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