ARCSA (www.arcsa.org) is a 501(c)(6) nonprofit with close to 1000 members in 14 nations, including large businesses, individuals, regulators, water purveyors, elected officials, manufacturers, designers, utility officials, installers, sustainability advocates, system maintainers, architects, plumbers and other enthusiasts. ARCSA offers resources, documents, presentations, webinars and discussion forums on its website and offers a workshop for rainwater harvesters.