Fema Nfhl

An MCP (Model Context Protocol) server that gives AI assistants direct access to the FEMA National Flood Hazard Layer (NFHL) — the official source for flood zone data in the United States.

Built on the official FEMA ArcGIS REST API.

Built by Revex.agency.

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Tools

Tool	Description
get_flood_zone	Look up the FEMA flood zone for a lat/lon. Returns zone code (AE, X, VE, etc.), SFHA status, floodway, BFE, and FIRM source panel.
get_firm_panel	Get the FIRM (Flood Insurance Rate Map) panel number and effective date for a location.
check_nfhl_availability	Check whether FEMA has NFHL flood map coverage for a location.
get_lomrs	Get Letters of Map Revision (LOMRs) affecting a location.
get_lomas	Get Letters of Map Amendment (LOMAs) near a location.
get_base_flood_elevations	Get Base Flood Elevation (BFE) lines near a location.

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Remote Usage (No Setup Required)

The server is deployed at:

https://fema-nfhl-mcp.vercel.app/api/mcp

Claude.ai (Browser)

1. Go to claude.ai → Settings → Integrations
2. Click Add custom MCP
3. Enter the URL: https://fema-nfhl-mcp.vercel.app/api/mcp
4. All 6 flood tools are immediately available in your conversations

Any MCP-Compatible Client

Add the remote server URL to your client's MCP configuration. No Node.js, no npm install, no build step required.

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Local Installation

Quick Start (npm)

npx fema-nfhl-mcp

Cursor

Add to .cursor/config.json:

{
  "mcpServers": {
    "fema-nfhl": {
      "command": "npx",
      "args": ["fema-nfhl-mcp"]
    }
  }
}

Claude Desktop

Add to %AppData%\Claude\claude_desktop_config.json (Windows) or ~/Library/Application Support/Claude/claude_desktop_config.json (macOS):

{
  "mcpServers": {
    "fema-nfhl": {
      "command": "npx",
      "args": ["fema-nfhl-mcp"]
    }
  }
}

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Development

Requirements

• Node.js 18+
• npm

Setup

git clone https://github.com/Revex-Agency/fema-nfhl-mcp.git
cd fema-nfhl-mcp
npm install
npm run build

Run from Source (no build step)

{
  "mcpServers": {
    "fema-nfhl": {
      "command": "npx",
      "args": ["tsx", "src/index.ts"]
    }
  }
}

Run from Build

{
  "mcpServers": {
    "fema-nfhl": {
      "command": "node",
      "args": ["/absolute/path/to/fema-nfhl-mcp/dist/src/index.js"]
    }
  }
}

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Data Source

All data is sourced in real time from the official FEMA NFHL ArcGIS REST service:

https://hazards.fema.gov/arcgis/rest/services/public/NFHL/MapServer

No API key required. No data is stored or cached locally.

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Flood Zone Reference

Zone	Description
A / AE / AH / AO / AR	High-risk flood zone (SFHA) — mandatory flood insurance for federally-backed mortgages
VE / V	High-risk coastal zone with wave action (SFHA)
X (shaded)	Moderate risk — 0.2% annual chance flood
X (unshaded)	Minimal risk
D	Undetermined risk (area not studied)

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License

MIT