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Table 19.7--National Water Quality Assessment Program study units in the South

Study year	Study unit	States
1991	Potomac River Basin	Virginia
1991	Albemarle-Pamlico Drainage	North Carolina, Virginia
1991	Apalachicola-Chattahoochee-Flint River Basin	Alabama, Florida, Georgia
1991	Georgia-Florida Coastal Plain	Georgia, Florida
1991	Ozark Plateaus	Arkansas, Oklahoma
1991	Trinity River Basin	Texas
1991	Rio Grande Valley	Texas
1994	South Central Texas	Texas
1994	Mississippi Embayment	Arkansas, Kentucky, Louisiana, Mississippi, Tennessee
1994	Southern Florida	Florida
1994	Kanawha-New River Basin	Virginia, North Carolina
1994	Upper Tennessee River Basin	Georgia, Kentucky, North Carolina, South Carolina, Tennessee, Virginia
1994	Santee Basin and Coastal Drainages	South Carolina, North Carolina
1997	Lower Tennessee River Basin	Tennessee, Alabama, Georgia
1997	Acadian-Pontchartrain	Louisiana, Mississippi
1997	Mobile River and Tributaries	Mississippi, Alabama, Georgia

Source: U.S. Geological Survey 2001b