---
title: "Mapped-wetland proximity and overlap evidence (FWS NWI)"
method: POST
path: "/api/locus_wetland_context"
tags: ["wetlands", "nwi", "fws", "environmental", "site-feasibility", "read-only", "free", "free"]
---

# Mapped-wetland proximity and overlap evidence (FWS NWI)

`POST /api/locus_wetland_context`

## Request

- Base URL: `https://api.locus.report`
- URL: `https://api.locus.report/api/locus_wetland_context`
- Auth: none required

Mapped wetland overlap and nearby polygons from the U.S. Fish & Wildlife Service National Wetlands Inventory, for buyer, owner and lender agents. Use before site work for a US address or point and a chosen radius. Map evidence only: not a delineation, jurisdictional determination, parcel boundary, or permit decision. Direct flat-body route for this one free resource; no API key, payment, or catalog wrapper. Return only the cited bounded evidence described here; this route never produces a paid brief or full report.

## Request body

- object
  - `address` string: US street address. Provide this or latitude+longitude.
  - `latitude` number: Decimal latitude; provide with longitude.
  - `longitude` number: Decimal longitude; provide with latitude.
  - `radiusMeters` integer: Mapped-wetland proximity search radius in meters; defaults to 250.

## Response `200`

Free cited evidence response.

- object

## Other responses

- `400`: Invalid request body.
- `429`: Rate limited.

---

[API](https://skmtc.dev/locus/apis/locus-api.md) · [All operations](https://skmtc.dev/locus/apis/locus-api/llms.txt) · [OpenAPI document](https://skmtc.dev/locus/apis/locus-api/revisions/ba7786b74adb?raw)