* [USGS National Water Information System (NWIS)](https://waterdata.usgs.gov/nwis) * [USGS Water Services](https://waterservices.usgs.gov/) - access to REST APIs * [Water Quality](https://www.waterqualitydata.us/) - this seems to be a work in progress * [pygeohydro Python module](https://pygeohydro.readthedocs.io/en/latest/index.html) * [PyGeoOGC](https://github.com/hyriver/pygeoogc) - provides general interfaces to web services that are based on [ArcGIS RESTful](https://en.wikipedia.org/wiki/Representational_state_transfer), [WMS](https://en.wikipedia.org/wiki/Web_Map_Service), and [WFS](https://en.wikipedia.org/wiki/Web_Feature_Service) * [USGS Web Service URL Generation Tool](https://waterservices.usgs.gov/test-tools/?service=dv&siteType=&statTypeCd=all&major-filters=sites&format=json&date-type=type-none&statReportType=daily&statYearType=calendar&missingData=off&siteStatus=all&siteNameMatchOperator=start) - useful for testing REST API stuff, perhaps * [Improved Public Delivery of Water Quality and Field Samples Data](https://waterdata.usgs.gov/blog/changes-to-sample-data/)