The American Water Works Association (AWWA) is an international nonprofit scientific and educational society dedicated to the improvement of drinking water quality and supply. Founded in 1881, AWWA is the largest organization of water supply professionals in the world. Its more than 50,000 members represent the full spectrum of the drinking water community: treatment plant operators and managers, scientists, environmentalists, manufacturers, academicians, regulators, and others who hold genuine interest in water supply and public health.

The California Urban Water Conservation Council provides a collection of Best Management Practices for urban water conservation. The collection offers 13 efficiency strategies including California program profiles and contact information. 

The Chesapeake Bay Program offers a database of Environmentally Sensitive Design Practices that provides information aimed at protecting the Bay and its local watersheds, but with references that are applicable in protecting water quality in other locations, as well. Topics addressed include aquatic buffers, stormwater management, erosion and sediment control, and land use planning.

EPA Water Use Efficiency Program offers many resources for efficiency in municipal, commercial and residential use, including Guidelines for Water Conservation Plans, references on Drought Management, Conservation Pricing and High-Efficiency Toilets, and Residential Water Conservation Techniques, a program that shows effective ways to save water inside and outside of residential property.

Georgia's Pollution Prevention Assistance Division maintains a Water Efficiency program including audit services, help for water utilities setting up a program, and success stories from water efficiency projects.

The Groundwater Foundation is dedicated to educating the public about the conservation and management of groundwater. 

The Watergy program of the Alliance to Save Energy provides assistance internationally to municipalities in making their water supply/delivery system more energy efficient.

National Environmental Training Center for Small Communities assists small communities by providing training and training-related information and referral services in the areas of wastewater, drinking water, and solid waste.

The National Institutes for Water Resources (NIWR) is a network of Research Institutes in every state. They conduct basic and applied research to solve water problems unique to their area. See the NIWR Directory of Water Resources Research Institutes for the Institute in your state.

Rocky Mountain Institute (RMI) Water Consulting Services offers a range of analytical services designed to complement the in-house expertise of water utilities. Services include initial planning of water efficiency programs, fine-tuning of existing programs, and long term planning. 

The Universities Water Information Network (UWIN) works to bring water resources to the information superhighway and the superhighway to water professionals. Online resources include research abstracts, databases, and announcements of grants and events in the field.

The Water Environment Federation (WEF) is a not-for profit technical and educational organization working to preserve and enhance the global water environment. Federation members number more than 41,000 water quality professionals and specialists from around the world, including engineers, scientists, government officials, utility and industrial managers and operators, academics, educators and students, equipment manufacturers and distributors, and other environmental specialists.

In Pennsylvania the Water Resources Education Network helps to make connections between citizens and water resources information. The group offers resources and grants for projects that help people understand how nonpoint source pollution affects their drinking water and waterways. WREN is a project of the League of Women Voters of Pennsylvania Citizens Education Fund.

WaterWiser – The Water Efficiency Clearinghouse is a partnership between the American Water Works Association, the U.S. EPA, and the Bureau of Reclamation to serve as the preeminent resource for water efficiency and conservation. WaterWiser provides following extensive resources: a calendar of activities and events, a bibliography with reference searching capabilities, books and publications for purchase, software, on-line articles, links, and a water efficiency service company directory. A WaterWiser listserve is also available through the site as an on-going forum for discussion.