Parameter codes
Parameter codes are 5-digit codes and associated descriptions used to identify the constituent measured and the units of measure. Some parameter code definitions include information about the sampling matrix, fraction, and methods used to measure the constituent. Some parameters are fixed-value (fxd) numeric codes having textual meaning (for example: parameter code 00041 is a weather code parameter, code of 60 means rain), but more commonly represent a numeric value for chemical, physical, or biological data.
metadata features
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Browse the data
Explore parameter codes observations in your browser! Requests made in a browser will default to returning HTML responses; add
f=jsonto 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.
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See the data dictionary
Field names, types, and definitions are provided as both an HTML table and a JSON schema file.
Other links
- The landing page of this server as JSON (application/json)
- The landing page of this server as HTML (text/html)
- This document as JSON (application/json)
- This document as RDF (JSON-LD) (application/ld+json)
- This document as HTML (text/html)
- Schema of collection in JSON (application/schema+json)
- Schema of collection in HTML (text/html)
- Queryables for this collection as JSON (application/schema+json)
- Queryables for this collection as HTML (text/html)
- Items as GeoJSON (application/geo+json)
- Items as RDF (GeoJSON-LD) (application/ld+json)
- Items as HTML (text/html)
- Items as CSV (text/csv; charset=utf-8)