Pennsylvania DEP, Bureau of Water Supply and Wastewater Management: Ground water and surface water regulations, drinking water data, and related studies and databases.
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.
Stroud Water Research Center: Seeks to advance the knowledge of freshwater ecosystems through interdisciplinary research into all aspects of streams, rivers, and their watersheds.
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.
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.