Maps & Data
one-time
Delaware River Basin Commission
DRBC Webinar: PFAS in the Delaware River Basin (June 15, 2026)
DRBC public webinar on PFAS field investigations and a new interactive Basin PFAS visualizer.
Maps & Data
Maps & Data
one-time
Maps & Data
rolling
NOAA National Weather Service
NOAA National Weather Service — Advanced Hydrologic Prediction Service
River stage forecasts, flood warnings, and precipitation data for watershed emergency management.
Maps & Data
rolling
Pennsylvania Department of Environmental Protection
Pennsylvania DEP eMapPA — Environmental Mapping Tool
Interactive state mapping application for water quality, permitted facilities, and environmental data.
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
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.