John Koeller

Technical Advisor

John Koeller is principal of Koeller & Company, based in California and providing engineering and environmental consulting services since 1973. He is a registered professional engineer (California) with extensive experience in and primary focus on water-efficient technologies and products. Internationally recognized as a specialist in these fields, Mr. Koeller is a consultant to various North American water authorities and private sector firms.

Mr. Koeller is currently a member of seven different ANSI U.S. national plumbing standards committees under the umbrella of ASME, CSA, and IAPMO, where he represents water efficiency interests. For Canada, he is a member of the Canadian Standards Association B45 and B125 Technical Committees responsible for developing product plumbing standards. 

He is a technical advisor to the international Alliance for Water Efficiency (AWE) and past technical advisor to the California Urban Water Conservation Council (CUWCC). His is also an advisor-consultant to the U.S. EPA's WaterSense® program, and other green building programs and initiatives.

Mr. Koeller is the co-developer of Maximum Performance (MaP) testing for toilet fixtures and other products, another very successful initiative dealing with product performance.  is now a leading web-based resource in North America for design professionals and consumers.