- American Rivers
- DC based organization promotes clean and safe waterways. Get the latest news.
- Anacostia Watershed Network
- Read how daily life impacts the watershed. Learn about the history, events, and culture associated with this area.
- Bridging the Watershed
- Group educates the public about the Potomac River. Newsletter available.
- Chesapeake Marine Aquaria Society
- Promotes marine fish keeping in the DC, Maryland and Virginia region. View photos of member tanks.
- DC Water Resources Research Institute
- Research, information transfer, and education institute at the University of the District of Columbia. Homepage presents publications, project and staff information, and related links.
- Interstate Commission on the Potomac River Basin
- Conservation group leads activities that preserve local waterways. Get information on participation.
- Potomac Conservancy
- Organization works to educate the public and protect the Potomac River. Calendar of events and resource list available.
- Potomac River Guide
- Learn about recreational and environmental activities concerning the river.
- USGS Water Resources of Maryland, Delaware, and the District of Columbia
- Provides real-time data about streamflow, water quality, and ground water in the region.
- Washington DC Marine Aquarist Society
- Group provides resources for those interested in keeping marine life in tanks. Photo gallery, forum, and calendar of events.
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