United States Geological Survey
National Water Information System
Continuous and discrete measurements of streamflow, groundwater level, water temperature and water quality from more than a million sites across the United States, with real-time telemetry from thousands of gauges.
Rights
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- No
- Restrictions
- Applies to material authored by US federal agencies. Third-party material carried within a federal product may be separately protected.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- United States Geological Survey
- Geographic coverage
- United States and territories
- Temporal coverage
- 1889 onwards
- Update frequency
- real-time
- Formats
- csv, json, xml, api
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- river flow, groundwater, quality, chemistry, reservoir
What Hydrionis uses it for
216,652 observations across 2 metrics currently reference this source.