California's AVA's

1. Wine with "California" on the label must contain 100% California grapes.
2. A county designation requires that at least 75% of the grapes must be from that county.
3. A wine with an AVA designation- such as Stags Leap- must contain 85% of the grapes from that AVA.
4. A Vineyard designated wine must contain 95% of its grapes from that vineyard. Vineyard names must be used along with County or AVA names.
5. California also has a law that requires "Napa Valley" to appear on labels in  conjunction with any sub-viticulture area within Napa, i.e. a label with the designation "Rutherford" must also have "Napa Valley".

California AVA's
Alexander Valley	North Coast
Anderson Valley	North Yuba
Atlas Peak	Northern Sonoma
Arroyo Grande Valley	Oakville
Arroyo Seco	Pacheco Pass
Ben Lomond Mountain	Paicines
Benmore Valley	Paso Robles
Bennett Valley	Potter Valley
Carmel Valley	Redwood Valley
Central Coast	Russian River Valley
Chalk Hill	Rutherford
Chalone	San Benito
Chiles Valley	San Francisco Bay
Cienega Valley	San Lucas
Clarksburg	San Pasqual Valley
Clear Lake	San Ysidro District
Cole Ranch	Santa Cruz Mountains
Diablo Grande	Santa Lucia Highlands
Dry Creek Valley	Santa Maria Valley
Dunnigan Hills	Santa Rita Hills
Edna Valley	Santa Ynez Valley
El Dorado	Seiad Valley
Fair Play	Shenandoah Valley/ California
Fiddletown	Sierra Foothills
Guenoc Valley	Solano County / Green Valley
Hames Valley	Sonoma Coast
Howell Mountain	Sonoma County / Green Valley
Knights Valley	Sonoma Mountain
Lime Kiln Valley	Sonoma Valley
Livermore Valley	South Coast
Lodi	Spring Mountain District
Los Carneros	St. Helena
Madera	Stags Leap District
Malibu-Newton Canyon	Suisun Valley
McDowell Valley	Temecula
Mendocino	Wild Horse Valley
Mendocino Ridge	Willow Creek
Merritt Island	York Mountain
Monterey	Yorkville Highlands
Mt. Harlan	Yountville
Mt. Veeder
Napa Valley