| Alaska's Water |
| Amazing Environmental Organization Web Directory |
| America's Threatened Streams |
| American Backflow Prevention Association |
| American Water Resources Association (AWRA) |
| American Water Works Association (AWWA) |
| Arizona Department of Water Resources |
| Arizona Water Resources Research Center |
| AWWA - American Water Works Association |
| AWWA Research Foundation |
| Bottled Water Web |
| California Department of Water Resources |
| Canadian Water & Wastewater Assoc. (CWWA) |
| Canadian Food Inspection Agency (CFIA) |
| Center for Disease Control (CDC) |
| CERES (California) |
| Chartered Institution of Water and Environmental Management (UK) |
| Caribbean Water and Wastewater Association (CWWA) |
| Colorado Department of Natural Resources |
| Colorado River Water Conservation District |
| Colorado State University - Water Center |
| Colorado Water Knowledge |
| Colorado Water Resources Research Institute |
| CSIRO Land and Water |
| CSO News Stormwater and sewer overflow solutions |
| EcoIQ Water & Wastewater |
| Educating Young People About Water |
| Engineering E-journal Search Engine |
| Environment Canada: Freshwater Web Site |
| EPA's Office of Ground Water and Drinking Water |
| EPA Office of Wetlands, Oceans and Watersheds |
| EPA Science Advisory Board (SAB) |
| EPA's Surf Your Watershed |
| FDA Microbiological Methods |
| Florida Water Facilities Online |
| Freshwater Integrated Resource Management with Agents (FIRMA) (UK) |
| Geologic Resources |
| Groundwater Remediation Project, Environment Canada |
| Healthy Water, Healthy People Education program based at Montana State University |
| The History of Water Filters - Provides an overview of past and present water treatment issues and alternatives |
| Hydrologic Information Center - Office of Hydrology, National Weather Service, National Oceanic and Atmospheric Administration, U.S. Dept. of Commerce |
| Idaho Ground Water Association |
| International Boundary and Water Commission |
| International Groundwater Modeling Center (IGWMC) |
| The Institute for Public Health and Water Research (IPWR) as a not-for-profit, independent science and education organization. |
| International Ozone Association - A not-for-profit Educational Association. |
| Irrigation Association |
| Johnson County Wastewater (Kansas) |
| Journal of Microbiological Methods |
| Kansas Rural Water Association |
| Kentucky Division of Water |
| LakeNet |
| Lifewater Canada |
| Lifewater International |
| Living Water (Kenya, Central America) |
| Long Island Water Corporation |
| Maine Department of Environmental Protection, Bureau of Land & Water Quality |
| MassDEP |
| Microbiological Diseases |
| Microbiological Hazards |
| Microbiological Media |
| Microbiological Techniques |
| Microbiological Water Pollution |
| Middle East Water Information Network |
| Missouri Freshwater Springs |
| Montana Water Center |
| National Drought Mitigation Center |
| National Extension Water Quality Database |
| National Ground Water Association |
| National Library for the Environment |
| National Small Flows Clearinghouse (NSFC), West Virginia University |
| National Water Research Institute (Canada) |
| Nebraska Water Center / Environmental Programs Unit |
| New Mexico State Engineer |
| New Mexico Water Resources Research Institute |
| North Carolina Water Resources Research Institute |
| Northwest Kansas Goundwater Management District #4, Colby, Kansas |
| NSF International - development of standards, product testing and certification services |
| OCETA - Ontario Centre for Environmental Technology Advancement |
| Office of Environmental Protection Agency |
| Oklahoma Water Resources Board |
| ONEIA - Ontario Environmental Industry Association |
| Ontario Ministry of the Environment |
| Ontario Ministry of Health |
| Powell Consortium. Alliance of seven Water Resources Centers and Institutes (AZ, CA, CO, NM, NV, UT & WY) cooperating on water issues related to the Colorado River and Great Basin |
| Project Clean Water - a San Diego regional collaborative |
| River Network Online |
| Rural Community Assistance Program - free assistance concerning drinking water supply and wastewater treatment needs |
| Selected Water Resources Abstracts |
| Sen. W.X. Wall Experiment Station |
| Sewage Net |
| Small Water Systems Website |
| South Carolina Department of Natural Resources |
| Tennessee Valley Authority |
| Texas Environmental Center |
| Texas Water Resources Institute |
| The Enviro Link |
| Universities Water Information Network (UWIN) |
| University of Western Australia - Centre for Water Research |
| U.S. Bureau of Reclamation |
| USDA Forest Service |
| U.S. Environmental Protection Agency (USEPA) |
| U.S. Geological Survey |
| U.S. Geological Survey, National Water-Quality Assessment (NAWQA) Program |
| U.S. Geological Survey Real-Time Water Data - Monitor stream levels in the U.S. and watch as floods evolve. |
| U.S. Geological Survey - Water Science for Schools |
| U.S. National Biological Survey |
| Utah Water Research Laboratory |
| Water Conditioning and Purification Magazine |
| Water Encyclopedia - Science and Issues |
| Water Environment Federation |
| Waterlife Foundation |
| WaterPartners International - water supply and sanitation needs in developing countries |
| Water Publications Digest |
| Water Resource Systems Research Laboratory |
| Water Science for Schools |
| Water Systems Council - focused on individual wells and other well-based water systems |
| WaterWiser - The Water Efficiency Clearinghouse |
| Western Governors' Association |
| Western States Water Council |
| World Bank |
| World Health Organization |
| WWF Global Network |
| Wyoming Water Resources Data System |
