PROFESSIONAL CERTIFICATION
Training and Certification for Designers, Installers and Inspectors
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GeezerVison is showing arcsainternational.org — ARCSA International | ARCSA International RAINWATER HARVESTINGRainwater, Stormwater, and Alternate Water Reuse Authority 
OUR MISSIONTo 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. 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
2027 ARCSA INTERNATIONAL SYMPOSIUMSave the Date! Join us May 18–19, 2027, at Grundfos Headquarters in Brookshire, Texas, for two days of advanced technical education, industry insights, and networking focused on the future of rainwater harvesting and water reuse.
Latest Achievements
ARTICLES & GUIDES
Preserving the Porter House Cistern: A Historic Rainwater System Brought Back Into ViewBeneath the dining room of the historic Porter House in Dumas, Arkansas, lies a hand-built brick rainwater cistern dating back to the home's early history. With an estimated capacity exceeding 5,000 gallons, the cistern offers a fascinating glimpse into how households once collected and stored rainwater for everyday use. Through a thoughtful restoration, the original structure has been preserved and transformed into an educational feature, complete with a glass viewing floor, lighting, and a modern recirculating water display. 
From Detention to Supply: The New Economics of Stormwater HarvestingStormwater 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. 
Action 5.9 of the National Water Reuse Action Plan CompletedARCSA 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. LATEST NEWS
ARCSA INTERNATIONAL UPDATES
ARCSA International Launches In-Field Certification Program for Rainwater Harvesting Systems
23 April 2026
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
12 November 2025
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
31 July 2025
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
03 June 2025
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
01 May 2025
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
06 June 2024
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. OUR SPONSORS | |||
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