| AIH (American Institute of Hydrology) |
| AMSA (Association of Metropolitan Sewer Agencies) |
| AMWA (Association of Metropolitan Water Agencies) |
| APWA (American Public Works Association) |
| ASDWA (Association of State Drinking Water Administrators) |
| AWRA (American Water Resources Association) |
| AWT (Association of Water Technologies) |
| AWWA (American Water Works Association) |
| AWWARF (AWWA Research Foundation) |
| Clean Water Action |
| Clean Water Network |
| Enviro-Net |
| EPA (the U.S. one) |
| EPA's Cleaner Water Through Conservation |
| EPA's Office of Wastewater Management |
| EPA's Oceans Page |
| EPA Compliance and Enforcement |
| Floodplain Management Association |
| NGWA (National Ground Water Association) |
| NRWA (National Rural Water Association) |
| NWRA (National Water Resources Association) |
| National Oceanic and Atmospheric Administration |
| National Response Center |
| Safedrinkingwater.com (weekly newsletter) |
| Soil and Water Conservation Society |
| NRDC's Stormwater Strategies |
| USGS Water Resources of the United States |
| USGS National Water Quality Assessment Data Warehouse |
| WSSCC (Water Supply and Sanitation Collaborative Council) |
| Water and Wastewater.Com |
| Water2Water (Azurix) |
| WaterInvestments.com |
| WaterTechOnline |
| Water Recycling |
| WateReuse Association |
| Watershed Management Council |
| Waterweek (AWWA) |
| WaterWiser |
| WEF (Water Environment Federation) |
| WERF (Water Environment Research Foundation) |
| WQA (Water Quality Association) |