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Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( focusable="false" ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Agency codes

Code identifying the agency or organization used for site information, data sources, and permitting agencies. Agency codes are fixed values assigned by the National Water Information System (NWIS).

metadata features

  • Browse the data

    Explore agency codes observations in your browser! Requests made in a browser will default to returning HTML responses; add f=json to your query to always get the JSON response.

  • Read the docs

    The OpenAPI documentation lists available query parameters and has a helpful query-builder interface you can use to bootstrap your requests.

  • See the data dictionary

    Field names, types, and definitions are provided as both an HTML table and a JSON schema file.

Other links

Reference Systems