What it does
USGS Water Data for the Nation provides water-data discovery and several documented access routes.
Choose the measurement category first: continuous observations, daily values, field measurements and discrete samples answer different questions. Find a monitoring location by identifier or area, then refine a state map or list by data type. Retain units, station identity and observation period with any values taken into analysis.
Strengths
- Monitoring-location lookup and data-type filtering
Best for
- Finding US water observations by location and measurement category
Sources
- Water Data for the Nation (Oct 26, 2026)