Inorganic Contaminants	Synthetic Organic Compounds	Volatile Organic Compounds
Asbestos Barium (IIB) Cadmium Chromium Fluoride Mercury Nitrate Nitrite Selenium Total Nitrate & Nitrite	Acrylamide Alachlor Atrazine Carbofuran Chlordane EDB Epichlorohydrin DBCP Heptachlor Heptachlor Epoxide Lindane Methoxychlor Toxaphene PCBs Pentachlorophenol (IIB) 2,4-D 2,4,5-TP	Cis-1,2-Dichloroethylene 1,2-Dichloropropane Ethylbenzene Monochlorobenzene O-Dichlorobenzene O-, M-, P-Xylenes Styrene Tetrachloroethylene Trans-1,2-Dichloroethylene Toluene

*Note:All contaminants regulated under Phase II execept where noted

The Phase II Rule became effective in 1992 with monitoring requirements beginning on January 1, 1993. This rule set drinking water standards for 30 inorganic and organic chemicals. All community and Non-Transient Non-Community water systems are required to monitor for and, if necessary, treat their supply for the regulated chemicals. Transient non-community water systems are required to comply only with the nitrate and nitrite regulations in Phase II.

The Phase II Rule roughly doubled the number of drinking water standards. While many of the Phase II chemicals occur in drinking water due to human activity, others are naturally occurring. Some chemicals are only rarely found in water supplies but are very widely used and were regulated because of the likelihood that they may contaminate supplies in the future.

Monitoring Requirements

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