Fema Nfhl MCP Server

@pipeworx/fema-nfhl

FEMA's National Flood Hazard Layer — the authoritative digital flood map. Effective FIRM flood hazard zones, base flood elevations, floodways, levees, cross-sections, LOMRs and LOMAs, the FIRM panel index and political jurisdictions, served as a public ArcGIS REST MapServer.

Part of Pipeworx — an MCP gateway connecting AI agents to 1683+ live data sources.

Tools

• nfhl_flood_zone_at_point(latitude, longitude, include_bfe?) — the effective FIRM flood zone at a coordinate: zone code and subtype, Special Flood Hazard Area flag, static BFE, governing DFIRM id, plus nearby BFE lines.
• nfhl_query(layer_id, where?, bbox?, out_fields?, limit?, offset?, order_by?, return_geometry?) — any NFHL layer by WHERE clause and optional envelope.
• nfhl_layers(filter?) — every layer with a plain-English guide to the ones that matter.

Auth

Keyless.

Data sources

• https://hazards.fema.gov/arcgis/rest/services/public/NFHL/MapServer — the MapServer.
• Layer 28 S_FLD_HAZ_AR (flood hazard zones), 27 S_FLD_HAZ_LN (boundary lines), 16 S_BFE, 1 S_LOMR, 34 S_LOMA, 3 S_FIRM_PAN, 23 S_LEVEE, 0 NFHL Availability.

Different API from the openfema pack. openfema serves the OpenFEMA tabular datasets — disaster declarations, individual and public assistance, NFIP claims and policies. This pack serves the geospatial flood map, which OpenFEMA cannot answer. Pair them: NFHL for the zone, openfema for the claims and declaration history of the county it sits in.

Traps

• STATIC_BFE is -9999 where no base flood elevation applies — a sentinel, not an elevation. This pack returns null for it.
• SFHA_TF ('T'/'F' as strings) is what answers "is this a Special Flood Hazard Area". FLD_ZONE alone does not: Zone X has two subtypes and one of them is the 0.2% annual chance (500-year) floodplain.
• NFHL coverage is not national. A community that has never been digitally mapped returns zero features, which means "not mapped", not "no flood risk". nfhl_flood_zone_at_point says so explicitly rather than returning an empty array that reads as a clean all-clear. Layer 0 (NFHL Availability) tells you which is which.
• Identifier fields are strings: DFIRM_ID='48201C', not 48201C.

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "fema-nfhl": {
      "url": "https://gateway.pipeworx.io/fema-nfhl/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/fema-nfhl/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1683+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

curl -X POST https://gateway.pipeworx.io/v1/tools/nfhl_flood_zone_at_point \
  -H 'Content-Type: application/json' \
  -d '{"latitude":29.7604,"longitude":-95.3698}'

No account needed for the first calls. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/nfhl_flood_zone_at_point. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.

Standalone (no gateway account)

This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:

{
  "mcpServers": {
    "fema-nfhl": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-fema-nfhl"]
    }
  }
}

Or run it directly to confirm it starts:

npx -y @pipeworx/mcp-fema-nfhl

It speaks MCP over stdin/stdout and answers initialize/tools/list/tools/call for only this pack's tools — none of the shared meta-tools the gateway connection above adds. Same source, same tools, no ask_pipeworx routing.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Fema Nfhl data" })

The gateway picks the right tool and fills the arguments automatically.

More

• Docs and guides
• pipeworx.io

License

MIT