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fema-nfhl-mcp

fema-nfhl-mcp

by Revex-Agency
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Hybrid

FEMA NFHL MCP Server

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.

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.

Related MCP server: mcp-hazards

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.

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"]
    }
  }
}

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"]
    }
  }
}

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.

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)

License

MIT

Available Tools

6 tools
check_nfhl_availabilityA

Check whether the FEMA National Flood Hazard Layer (NFHL) has official flood map coverage for a given location. Run this first if other tools return no data — it tells you whether FEMA has mapped this area at all.

Inputs: lat (required), lon (required).

get_base_flood_elevationsA

Get Base Flood Elevation (BFE) lines near a location from the NFHL. The BFE is the elevation (in feet above datum) that floodwaters are expected to reach during a 1% annual chance (100-year) flood. Critical for construction requirements and insurance rating. Searches within ~100m of the coordinate. BFEs are not present in all flood zones (e.g. Zone X).

Inputs: lat (required), lon (required).

get_firm_panelA

Get the FEMA FIRM (Flood Insurance Rate Map) panel number and metadata for a location. Returns the official panel number, suffix, effective date, and panel type. Use this to identify which flood map covers a location and when it was last updated.

Inputs: lat (required), lon (required).

get_flood_zoneA

Look up the FEMA flood zone designation for a lat/lon coordinate using the official National Flood Hazard Layer (NFHL). Returns the zone code (e.g. AE, X, VE, AO), whether the location is in a Special Flood Hazard Area (SFHA), floodway status, static BFE, and the FIRM panel citation. This is the primary tool for flood risk lookup.

Inputs: lat (required), lon (required).

get_lomasA

Get Letters of Map Amendment (LOMAs) near a location. A LOMA is an official FEMA letter that removes a specific structure or parcel from a Special Flood Hazard Area without physically revising the Flood Insurance Rate Map. Searches within ~100m of the coordinate.

Inputs: lat (required), lon (required).

get_lomrsA

Get Letters of Map Revision (LOMRs) that affect a location. LOMRs are official FEMA revisions to the Flood Insurance Rate Map — they can change flood zone designations. Returns case number, project name, effective date, and status for each revision.

Inputs: lat (required), lon (required).

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    Deploy Server
    One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

    TDQS

    A4/5.0

    Scored across 6 tools

    Disambiguation4/5

    Each tool targets a distinct FEMA flood data concern, but get_flood_zone and get_firm_panel overlap slightly since both return panel-related information, and get_lomrs/get_lomas are easy to confuse by name. The descriptions do clearly distinguish them, so ambiguity is limited.

    Naming Consistency5/5

    Tool names follow a consistent get_* verb-noun pattern, with check_nfhl_availability being the only deviation but still following the same predictable style. All names are lowercase snake_case and clearly indicate their resource or action.

    Tool Count5/5

    Six tools is a well-scoped set for a FEMA flood hazard lookup server. Each tool provides a meaningful, non-redundant capability and the count is appropriate for the domain.

    Completeness4/5

    The surface covers the core workflow: checking availability, getting the flood zone, identifying the FIRM panel, finding revisions/amendments, and retrieving BFE data. Minor gaps such as address-based lookup or more detailed NFHL layer queries are possible but not critical to the stated purpose.

    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

    Resources

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