The U.S. Environmental Protection Agency Region 2 Superfund site - this site provides background information primarily on the dioxin Superfund site within the tidal portion of the Lower Passaic.

New Jersey Department of Environmental Protection - GIS database web site - this site provides access to many GIS data layers relevant to watershed analysis.

New Jersey Department of Environmental Protection - Watershed Management Division - this division of NJDEP is responsible for watershed protection.

New Jersey Department of Environmental Protection - Water Quality Division - this division of NJDEP is responsible for drinking water quality and permitting.

New Jersey Environmental Data Library - a source of maps and other information about New Jersey's environment maintained by Rutgers University.

North Jersey District Water Supply - a public water supply company located on the Wanaque Reservoir in Wanaque that maintains a database on Watershed Management Areas 3, 4, and 6.

Passaic Falls - a web site dedicated to the Great Falls in Paterson - largely historical information.

Passaic River - a web site dedicated to Passaic River news, etc.

Passaic River Coalition - a non-profit environmental organization dedicated to the Passaic River

Passaic River Institute - an institute established at Montclair University in 2004 dedicated to research on the Passaic River.

Passaic River Restoration Initiative - a web site dedicated to the Passaic River

Passaic Valley Sewerage Commissioners - located in Newark, this sewage plant serves most of the Lower Passaic River watershed and conducts water quality analyses on the Passaic River and some tributaries from Newark Bay up to Two Bridges.

Passaic Valley Water Commission - a public water supply company located in Little Falls that draws water from the Passaic River and provides potable water for many municipalities in the Lower Passaic watershed.

U.S. Geological Survey - first source for long-term data on water quality and discharge in New Jersey Streams.