PROFESSIONAL CERTIFICATION
Training and Certification for Designers, Installers and Inspectors
RAINWATER HARVESTING
The Forgotten Resource
OUR MISSION
To provide resources and information on rainwater and stormwater collection, making rainwater conservation accessible to all and to work with government at every level to promote the advancement of rainwater management.
RAINWATER SYSTEM CERTIFICATION
Certify your rainwater system to the ARCSA/ASPE/ANSI Standard 63
EDUCATION
Comprehensive educational resources about rainwater harvesting
ARCSA MEMBERSHIP
Become an ARCSA member and help advance water reuse across the country
ARCSA is a grass-roots, membership-based organization with access to leading news and advancements in rainwater catchment technology. This site establishes a forum for members to share and gain knowledge about this growing industry. Members range from government officials, academia professionals, consultants, and manufacturers/suppliers of rainwater harvesting equipment, to backyard amateurs and passionate conservationists. ARCSA aims to provide expertise and information on the importance of rainwater collection environmentally, economically, and socially in a way that is accessible to all. Here you will find everything you need to know about rainwater harvesting for both potable and nonpotable purposes. You can also take training courses to earn a certification to become an accredited rainwater harvesting professional in the industry.
UPCOMING EVENT
ARCSA INTERNATIONAL CONFERENCE
Join us in Universal City, California for the 2026 ARCSA International Annual Conference. Set against the iconic backdrop of Los Angeles and Hollywood.
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September 16-17, 2026 | Sheraton Universal | Universal City, CA |
Latest Achievements
ARTICLES & GUIDES
From Detention to Supply: The New Economics of Stormwater Harvesting
Stormwater is increasingly being viewed not simply as runoff to manage, but as a valuable water resource. By capturing, treating, and reusing stormwater, facilities can reduce reliance on municipal supplies while supporting irrigation, cooling, industrial processes, and other non-potable demands.
As water costs rise and concerns around drought resilience and infrastructure grow, stormwater harvesting is creating new opportunities to turn traditional compliance infrastructure into a productive, long-term asset.
Action 5.9 of the National Water Reuse Action Plan Completed
ARCSA International has completed Action 5.9 of the National Water Reuse Action Plan, an effort focused on identifying opportunities and addressing barriers to broader adoption of nonresidential onsite rainwater and stormwater catchment systems. The action highlights challenges such as inconsistent regulations, limited technical data, and permitting uncertainty, while outlining how research, policy alignment, workforce development, and system-level verification can help advance rainwater harvesting nationwide effectively.
From Stormwater to Supply
As communities across the Southeast face heavier rainfall, prolonged drought, and growing pressure on aging infrastructure, rainwater catchment offers a practical path toward greater water resilience. This article explores how well-designed systems can reduce stormwater runoff, supplement water supplies, and support long-term sustainability. It also highlights the importance of proper filtration, storage, treatment, maintenance, and supportive policies in helping rainwater systems perform effectively and gain wider adoption.
LATEST NEWS
ARCSA INTERNATIONAL UPDATES
ARCSA International Launches In-Field Certification Program for Rainwater Harvesting Systems
ARCSA International® has announced the launch of its Rainwater Harvesting System Certification Program, a comprehensive in-field certification program designed to verify that rainwater harvesting systems are designed, installed, and operating in compliance with ARCSA/ASPE/ANSI Standard 63.
ARCSA International Announces Technical Symposium Event for May 2026
ARCSA International will host a new Technical Symposium May 20–21, 2026, at Grundfos Headquarters in Brookshire, Texas. This two-day event will feature advanced training, industry updates, technology displays, and networking opportunities, with full program details coming later this year.
ARCSA International Announces Partnership with Reservoir Center for Water Solutions
ARCSA International has joined the Reservoir Center for Water Solutions as an official partner, furthering its mission to promote sustainable water practices and expand collaboration within the global water community.
ARCSA Rainwater Harvesting Classes Approved for Continuing Education in Ohio
ARCSA International is proud to announce that its Professional Rainwater Harvesting Classes for Designers, Installers, and Inspectors have been officially approved by the Ohio Department of Health for continuing education (CE) credits for registered private water systems contractors.
Rainwater and Stormwater Standards Consensus Body Members Sought for Development of ARCSA/ASPE/IAPMO Standards 63 and 78
Ontario, Calif. — IAPMO®, the American Society of Plumbing Engineers (ASPE) and ARCSA International are seeking technical experts to participate in the following consensus bodies: Rainwater Standards Committee and Stormwater Standards Committee.
U.S. GSA’s P100 Document Now Requires ARCSA International Standard Compliance
ARCSA International is pleased to announce the United States General Services Administration (GSA) has accepted its proposed change for the Facilities Standards for the Public Buildings Service (P100), requiring major capital projects of more than 5,000 square feet employing rooftop rainwater catchment and harvesting systems to comply with relevant ARCSA/ASPE/ANSI standards.
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