Maps & Data
rolling
U.S. Geological Survey
StreamStats — USGS Streamflow Statistics Tool
Web-based GIS tool for streamflow statistics, watershed delineation, and flood frequency analysis.
Maps & Data
Maps & Data
rolling
Maps & Data
rolling
Pennsylvania Spatial Data Access (Penn State)
Pennsylvania Spatial Data Access (PASDA) — Water Resources Datasets
Pennsylvania's official geospatial data clearinghouse with free GIS datasets for water resources.
Maps & Data
rolling
U.S. Environmental Protection Agency
EPA WATERS GeoViewer — Watershed Assessment and Mapping
Interactive mapping tool for water quality data, impaired waters, and watershed boundaries.
Maps & Data
rolling
U.S. Geological Survey
USGS National Water Information System (NWIS)
Comprehensive national database of real-time and historical water data from 1.5 million monitoring sites.
Maps & Data
rolling
Federal Emergency Management Agency
FEMA Flood Map Service Center
Official FEMA portal for accessing Flood Insurance Rate Maps (FIRMs), Letters of Map Change, and flood risk data…
Maps & Data
rolling
U.S. Geological Survey
USGS Water Data for the Nation
National water data portal providing real-time and historical streamflow, groundwater, water quality, and reservoir data from thousands of…
Maps & Data
rolling
Pennsylvania Department of Environmental Protection (DEP)
PA DEP eMapPA and Water Quality Database
Pennsylvania's official interactive environmental data mapping tools including integrated water quality monitoring results and impaired waters.
Maps & Data
rolling
U.S. Environmental Protection Agency
EPA How’s My Waterway
User-friendly EPA tool showing water quality status, impairment information, and drinking water data for any location in the…
Maps & Data
rolling
U.S. Environmental Protection Agency
EPA ECHO — Enforcement and Compliance History Online
Federal database providing compliance and enforcement data on regulated facilities including wastewater dischargers and stormwater permit holders.
Maps & Data
rolling
NOAA Office for Coastal Management
NOAA Digital Coast
Federal platform providing coastal and Great Lakes data, training, and tools — relevant to Pennsylvania's Lake Erie shoreline…
Experts & Providers
rolling
Western Pennsylvania Conservancy / PA DCNR partnership
Pennsylvania Natural Heritage Program (PNHP)
State biodiversity data program providing species and habitat information critical for watershed conservation planning and project siting.
Experts & Providers
rolling
Academy of Natural Sciences of Drexel University
Academy of Natural Sciences — Patrick Center for Environmental Research
Leading freshwater research institute providing biomonitoring, water quality analysis, and stream ecology expertise for regional watershed projects.