CERTIFICATIONS
Training and Certification to Start a Business
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.
EDUCATION
Learn More About Rainwater Harvesting
ARCSA MEMBERSHIP
Become a Part of Our Organization
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 TECHNICAL SYMPOSIUM
This premier event brings together professionals and enthusiasts in rainwater harvesting and stormwater management to advance industry expertise and innovation.
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May 20-21, 2026 | GRUNDFOS | Brookshire, TX |
Latest Achievements
ARTICLES & GUIDES
National Standards and Professional Certification: Why ARCSA Membership Matters
As rainwater and stormwater harvesting systems become more widely adopted, the need for clear, reliable standards has never been more important. Standards ensure systems are designed and installed safely, operate effectively, and meet regulatory requirements. They provide confidence to property owners, clarity for code officials, and consistency for industry professionals. Join ARCSA today and help lead the advancement of safe, reliable rainwater and stormwater harvesting practices.
Case Study: A Community Building Its Own Water Security
The Campsite at Shield Ranch Rainwater Harvesting (RWH) system was the first building-scale rainwater supply in Texas permitted as a Public Water Supply System (PWSS). Achieving this required extensive coordination with the Texas Commission on Environmental Quality (TCEQ), including submitting exception requests for non-standard storage tanks and a cartridge filter treatment unit, designing a customized treatment train, and engineering the water pressurization and distribution systems.y
Greenhouses and Rainwater Harvesting: Cultivating Sustainability Year-Round
Rainwater harvesting in greenhouses is a sustainable way to reduce water use, lower costs, and improve plant health. By capturing rain instead of relying on treated water, growers support soil health and cut environmental impact. From large farms to backyard gardens, successful systems around the world show how this simple method can provide year-round irrigation, even in dry regions. With proper setup, it's a practical step toward more resilient and eco-friendly food production.
LATEST NEWS
ARCSA INTERNATIONAL UPDATES
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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