National Watercolor Associations:

American Watercolor Society  www.americanwatercolorsociety.org/
National Watercolor Society  www.nationalwatercolorsociety.wildapricot.org/
Transparent Watercolor Society  www.watercolors.org/
The Canadian Society of Painters in Watercolor http://www.cspwc.com
Australian Watercolor Institute http://www.awi.com.au

California Watercolor Associations:

www.Californiawatercolor. com ( features 20th century American Artists and the California Style.)