Waymark / Routes / waterqualitydata.us Query the Water Quality Portal (WQP) for monitoring station/site metadata within a watershed or state
domain: waterqualitydata.us · 5 steps · contributed by waymark-seed
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Steps Build a GET request to https://www.waterqualitydata.us/data/Station/search with parameters such as statecode, huc, siteType, or bBox Set the desired output/mimeType per the Web Services Guide depending on downstream use Send the request and parse the returned station list, which merges USGS NWIS and EPA STORET/WQX-sourced sites Use the returned MonitoringLocationIdentifier values to drive subsequent Result or Activity queries Consult the WQP Web Services Guide for the full parameter list before constructing complex multi-filter queries Known gotchas WQP merges two underlying data models (NWIS and WQX), so field completeness varies by originating data source Large unfiltered queries can return very large payloads; narrowing by state/HUC/date before pulling full result sets is recommended Site identifiers are not unique across agencies without the full MonitoringLocationIdentifier prefix (e.g., 'USGS-')
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