usgswater

Wraps the USGS National Water Information System REST APIs so you can query real time water data from thousands of monitoring sites across the US. No API key needed. Part of the Pipeworx gateway, which means you can either use it standalone or access it through their unified endpoint alongside 250+ other data sources. The repo doesn't list specific tools, but NWIS typically covers stream flow, groundwater levels, reservoir storage, and water quality measurements. Useful when you need hydrological data for analysis, monitoring, or building apps that track drought conditions, flood risk, or water availability. Available over streamable HTTP transport.