The American Rainwater Catchment Systems Association (commonly referred to as ARCSA) is an American non-profit association founded by Dr. Hari Krishna in 1994,[1] focused on rainwater awareness and to promote sustainable rainwater harvesting (RWH) practices in the United States and around the world.

ARCSA's efforts include: creating a favorable regulatory atmosphere, creating a resource pool and educating professionals and the general public regarding safe rainwater harvesting design, installation and maintenance practices.

In 2014, ARCSA created a White House petition to stimulate the rainwater-harvesting industry.

[2] While the petition didn't receive the 100,000 votes in 3 months needed to move to the next stage, ARCSA used this as a platform to begin a petition with Change.org to create an International Rainwater Harvesting Day.

In 2015, ARCSA merged with the Canadian Association of Rainwater Management (CANARM) and will continue as a North American association.