usgs.gov valid
Water Data APIs
Documentation and machine-readable indexes for the USGS water data APIs, which publish streamflow, groundwater, water-quality, and imagery observations for the United States.
For agents: USGS Water Data APIs docs: streamflow, daily values, groundwater, water quality and imagery endpoints, with a free API key signup and agent integration guide.
usgs water datastreamflowgroundwater datawater qualityapi key
- Authority
- 65 reach 24 · trust 5 · quality 21 · freshness 15
- Tier
- listed
- llms.txt
- https://api.waterdata.usgs.gov/llms.txt
- Sections
- 5
- Links
- 35
- Size
- 7937 bytes
- Popularity rank
- #478
- Registered
- 1997-10-02
- Country
- United States Hosting inference
- Hosting country
- United States Hosting inference
- Country evidence
- No published address evidence collected yet
- Categories
- Science and research · APIs and SDKs · Data and analytics
- For agents
- Interface: a documented API or declared MCP endpoint an agent can call
- Inferred actions
- Read documentation Call an API Download data About these labels
- Audience
- developers · agents can: read docs, call api, download data · en
- First seen
- 2026-10-18T14:18:43.682Z
- Last checked
- 2026-10-25T11:09:39.586Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-25T11:09:38.407Z. Cached copy · Source on usgs.gov
# Water Data APIs
> Documentation and machine-readable indexes for the USGS water data APIs, which publish streamflow, groundwater, water-quality, and imagery observations for the United States.
Every link below is a document this site publishes or an API this site documents. Documentation pages also exist as plain markdown at the same URL with "index.html.md" appended, and those are the URLs listed here where they exist.
Retrieve data from the endpoints under "API endpoints" rather than by fetching these pages. Requests are rate limited; register a free API key on the signup page and send it as the api_key query parameter or the X-Api-Key request header.
## Start here
- [USGS Water Data APIs](https://api.waterdata.usgs.gov/): Discover modernized USGS water data APIs for streamflow, daily values, monitoring locations, water quality, and imagery.
- [Agent and Automation Integration Guide](https://api.waterdata.usgs.gov/docs/agents/index.html.md): Machine-readable entry points for automated consumers of this site: the llms.txt index, Markdown page copies, the...
- [Get a USGS Water Data API Key](https://api.waterdata.usgs.gov/signup/): Register a free API key for the USGS water data APIs to receive higher rate limits and make more requests per hour.
## Documentation
- [USGS Water Data API Documentation](https://api.waterdata.usgs.gov/docs/): Browse documentation for every API hosted on api.waterdata.usgs.gov, including the OGC, STAC, samples, and imagery...
- [Getting Started with the NIMS Imagery API](https://api.waterdata.usgs.gov/docs/nims/index.html.md): Learn how the NIMS API lists cameras at USGS gaging stations and how to build full image URLs from the filenames it...
- [HIVIS Imagery Visualization Application](https://api.waterdata.usgs.gov/docs/nims/hivis/index.html.md): HIVIS is the web application for browsing images and time-lapse videos that NIMS collects at USGS monitoring sites.
- [About the National Imagery Management System](https://api.waterdata.usgs.gov/docs/nims/overview/index.html.md): NIMS is the serverless USGS infrastructure that collects, stores, processes, and delivers imagery from monitoring...
- [Getting Started with USGS Water Data OGC APIs](https://api.waterdata.usgs.gov/docs/ogcapi/index.html.md): Learn how the USGS OGC API endpoints are structured and how to query continuous values, daily values, and location...
- [Complex Water Data Queries with CQL2](https://api.waterdata.usgs.gov/docs/ogcapi/complex-queries/index.html.md): Use CQL2 POST requests to query the USGS water data APIs for multiple sites, parameter codes, or value ranges at once.
- [Making Efficient Water Data API Queries](https://api.waterdata.usgs.gov/docs/ogcapi/efficiency/index.html.md): Speed up USGS water data API requests by limiting fields, narrowing time ranges, and splitting large queries into...
- [Access USGS Water Data with QGIS](https://api.waterdata.usgs.gov/docs/ogcapi/gis/index.html.md): Follow a step-by-step walkthrough for addin
…Related sites
Similar publisher descriptions and documentation. Similarity does not imply affiliation or equivalent capabilities.
| Domain | Title | Category | Country | Authority | llms.txt | llms-full.txt | Save |
|---|---|---|---|---|---|---|---|
| worldtides.info | WorldTides | interface APIs and SDKs | US | 51 | ✓ | ||
| kindwise.com | Kindwise | interface AI and machine learning APIs and SDKs +1 | US | 52 | ✓ | ||
| raindrop.farm | RainDrop | interface Data and analytics APIs and SDKs | US | 53 | ✓ | ||
| emoncms.org | Emoncms | interface APIs and SDKs Open source projects | GB | 57 | ✓ | ✓ | |
| insurgrid.com | InsurGrid | interface AI and machine learning Insurance +1 | US | 51 | ✓ | ||
| synopticdata.com | Synoptic Data | interface Data and analytics Science and research | GB | 57 | ✓ | ||
| visualcrossing.com | Visual Crossing Weather API | interface APIs and SDKs Data and analytics | US | 57 | ✓ | ||
| datacommons.org | Data Commons Documentation | interface Documentation and reference Data and analytics +1 | US | 64 | ✓ | ✓ |
Machine-readable: GET /v1/resolve?q=usgs.gov · GET /v1/domain/usgs.gov · this page as Accept: application/json or text/markdown · MCP lookup_domain
Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.
Own or manage this website?
If you own or manage usgs.gov, you can update its listing and review file health, discovery activity and score history.
Manage this listing — optional
What verification unlocks
See how your site is discovered—and control what agents see.
- See your website in the map
Review your indexed topics, nearby publishers sharing headings, measured listing exposure and map snapshots in a private report for your website.
- Control what agents see
Edit your listing description, tags, public contact details and additional llms.txt paths. Publish your terms for automated access, attribution and pricing.
- Make your profile eligible for search
A valid, listed, unblocked, verified profile can appear in our publisher sitemap and become eligible for search-engine visibility. Search engines decide what to index and rank.
- Appear in our llms-full.txt
Eligible verified publishers are listed by name, with their file links and summaries, in the service overview agents can read.
Free. No account registration, backlink or payment required. Public discovery remains available without verification.
Let your coding agent verify it
If your coding agent is authorized to manage this website, paste these instructions into it.
Claim my listing on Agent Web Map for usgs.gov:
1. POST https://agentwebmap.com/v1/sites/usgs.gov/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://usgs.gov/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/usgs.gov/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/usgs.gov).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verifyCorrections or removal requests: contact the directory.