- Baykeeper
 - Works to protect, preserve, and restore the ecological integrity and productivity of the Hudson/Raritan Estuary, its tributaries, and watershed. - Cook Inlet Keeper
- Nonprofit organisation monitors water quality in order to protect the Cook Inlet and Kachemak Bay watershed and the life it sustains.
- Orange County CoastKeeper
- Dedicated to keeping the county bays, coastal estuaries, watersheds, nature preserves, and wildlife refuges clean and free of contamination.
- Riverkeepers@
- Soundkeeper
- Dedicated to the protection and enhancement of the biological, physical, and chemical integrity of Long Island Sound and its watershed.
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