Perkiomen Watershed Conservancy
- Founded to protect and conserve the natural resources of the 362 mile Perkiomen Watershed. Promotes an environmental ethic through education, land conservation and watchdog activities.
- http://www.perkiomenwatershed.org/

Stroud Water Research Center
- Seeks to advance the knowledge of freshwater ecosystems through interdisciplinary research into all aspects of streams, rivers, and their watersheds.
- http://www.stroudcenter.org/

Pennsylvania DEP, Bureau of Water Supply and Wastewater Management
- Ground water and surface water regulations, drinking water data, and related studies and databases.
- http://www.dep.state.pa.us/dep/deputate/watermgt/WSM/wsm.htm

Watershed Atlas of the Allegheny River
- Rich source of information about the environmental resources of the Allegheny River watershed and how human activities affect water quality and the environment.
- http://www.watershedatlas.org/index.html

Upper Perkiomen Watershed Coalition
- Promotes public education and land use planning to protect the natural beauty of the Upper Perkiomen Watershed in Montgomery County Pennsylvania.
- http://www.upwcwatershed.org/