data api · United States

National Wetlands Inventory

The US National Wetlands Inventory (NWI) is a publicly available resource that provides detailed information on the abundance, characteristics, and distribution of US wetlands. The US Fish and Wildlife Service (FWS) is the principal US Federal agency tasked with providing information to the public on the status and trends of our Nation's wetlands. Wetlands provide a multitude of ecological, economic and social benefits.

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What's in it

Data offered docs-verified: wetlands (per-state layers) · WETLAND_TYPE field · Shape_Area field · historic_wetlands · riparian · hu8_boundary · state_boundary · metadata
Coverage docs-verified: United States (51 state-level parquet files)
Formats docs-verified: GeoParquet · Parquet
Access docs-verified: Public, no credentials shown; HTTPS and S3 (AWS CLI) access. Licence not stated in DOCS.

Useful for

Use cases llm-inferred: FRA baseline: wetland and riparian polygons near a US site for constraints screening · Wetland area and type summary by state for an ecological baseline · Wetland and riparian overlap check for a US environmental assessment
Audience llm-inferred: environmental consultants · ecologists · GIS analysts · hydrologists

Limitations

Constraints llm-inferred: US only; no UK coverage · Third-party copy of the FWS National Wetlands Inventory, not the original source · Licence not stated in DOCS; check the product README · No state name field; state must be derived from the filename · Full national queries take about 3 minutes · Parquet files total 75.8 GB · No update frequency or source vintage stated; copy last updated 21 Aug 2025 · No spatial resolution stated

Licence: see product README
Authentication: Public; anonymous HTTPS/S3 access via data.source.coop
GitHub stars: Unknown
Last commit: Unknown
Last successful page check: 14/10/2026
Page health: page reachable
Package: Not recorded
Verification: Not independently verified

Provenance & evidence

Verified via Source Cooperative API /api/v1/products/giswqs (public product, updated 2025-08-21).

Metadata observed 14/10/2026 · research sweep: manual-2026-10-15 (source.coop)