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USFWS Wetlands Proximity Screener - Section 404 Site Risk API

Wetland due-diligence API for site selection: per lat/lon site, wetland presence within radius, Cowardin classification codes/systems, wetland types, total acreage nearby and a Section 404 dredge-and-fill screening flag. USFWS National Wetlands Inventory open data.

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from $4.40 / 1,000 results

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Kyle Maloney

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Asset label

asset_label

Optional

Label of the screened site, as supplied, or "lat,lon" when none was given.

Type:string | null

Asset latitude

asset_lat

Optional

Latitude of the screened site (WGS84 decimal degrees).

Type:number | null

Asset longitude

asset_lon

Optional

Longitude of the screened site (WGS84 decimal degrees).

Type:number | null

Screening radius (m)

radius_meters

Optional

Radius in metres used for the wetland presence check around this site. v1.1 screens a TRUE circle; v1.0 used a bounding box that reached sqrt(2)*R at its corners and over-reported by 26.7-45.1 percent at the sites measured live.

Type:integer | null

Wetland within radius

wetland_within_radius

Optional

True when at least one NWI-mapped wetland polygon intersects the circular screening radius. False only when the radius query succeeded and returned nothing. NULL when the radius query was unavailable - null means NOT CHECKED, never "clear".

Type:boolean | null

Wetland feature count

wetland_count

Optional

Number of distinct NWI wetland polygons intersecting the screening radius. This is the exact server-side count when the count query succeeded, so it stays correct even if the feature pages were truncated.

Type:integer | null

Cowardin codes

cowardin_codes

Optional

Unique NWI Cowardin classification codes (ATTRIBUTE) within the radius, e.g. L1UBH, PEM1C, PFO1/2C.

Type:(string | null)[] | null

Cowardin systems (v1.0 labels)

cowardin_systems

Optional

Decoded Cowardin system names in the verbose v1.0 wording, kept unchanged for pipelines keyed to it. Prefer cowardin_system_names, which comes from the authoritative NWI code table.

Type:(string | null)[] | null

Wetland types

wetland_types

Optional

Unique plain-English NWI wetland types (WETLAND_TYPE) within the radius, e.g. Lake, Freshwater Emergent Wetland, Estuarine and Marine Wetland.

Type:(string | null)[] | null

Nearest wetland type

nearest_wetland_type

Optional

Plain-English NWI type of the TRUE nearest wetland polygon. In v1.0 this field held the largest-acreage feature instead; v1.1 measures the nearest and preserves the old meaning in primary_wetland_type_by_acreage. See distance_method for how it was resolved.

Type:string | null

Nearest wetland Cowardin code

nearest_wetland_code

Optional

Cowardin classification code of the TRUE nearest wetland polygon.

Type:string | null

Total acres within radius

total_acres_within_radius

Optional

Sum of NWI ACRES across every wetland polygon intersecting the radius. NULL when the feature set was truncated - a sum over an arbitrary subset is a wrong answer, not a partial one.

Type:number | null

Section 404 screening flag

section_404_flag

Optional

True when a mapped wetland or deepwater habitat is present within the radius, indicating the site may trigger Clean Water Act Section 404 permitting and a formal wetland delineation. NULL when any contributing NWI query was unavailable. Screening indicator only - NOT a jurisdictional determination.

Type:boolean | null

Error

error

Optional

Error message on an ERROR row (bad coordinates, or every NWI query failing for this site). Null on a successful row.

Type:string | null

Checked at

checked_at

Optional

ISO 8601 UTC timestamp of the screening run.

Type:string | null

Source URL

source_url

Optional

USFWS National Wetlands Inventory MapServer layer the wetland data came from.

Type:string | null

NWI source status

nwi_status

Optional

Overall outcome of the NWI reads for this site: ok, partial (some data retrieved, some missing or truncated), or unavailable.

Type:string | null

NWI error detail

nwi_error

Optional

Concatenated per-query failure messages when anything went wrong. Null on a fully clean row.

Type:string | null

On-site query status

onsite_query_status

Optional

Outcome of the point-in-polygon query: ok or unavailable.

Type:string | null

Radius query status

radius_query_status

Optional

Outcome of the circular radius query: ok, partial (truncated at the page cap) or unavailable.

Type:string | null

Nearest query status

nearest_query_status

Optional

Outcome of the nearest-wetland search: ok, none_within_search_radius, skipped (turned off via computeNearestDistance) or unavailable.

Type:string | null

Data partial

data_partial

Optional

True when this row was built from an incomplete set of NWI reads. Read it before trusting any count or acreage on the row.

Type:boolean | null

Results truncated

results_truncated

Optional

True when the NWI service reported exceededTransferLimit and the page cap was reached, so not every polygon in the radius was retrieved. Acreage and composition fields are nulled out when this is true.

Type:boolean | null

Query geometry method

query_geometry_method

Optional

Which geometry was sent to the service: circle_buffer (a true point + distance query, the v1.1 default) or bbox_envelope (the v1.0 fallback, which over-reports).

Type:string | null

Server-reported count

wetland_count_reported_by_server

Optional

Exact polygon count returned by a returnCountOnly query against the same circle. Compare against the number of retrieved features to detect truncation independently.

Type:integer | null

Wetland on site

wetland_on_site

Optional

True when the site coordinate itself falls inside a mapped NWI wetland polygon (a true point-in-polygon test, distance parameters omitted - distance=0 returns nothing on this service). NULL when the point-in-polygon query was unavailable.

Type:boolean | null

On-site Cowardin code

on_site_wetland_code

Optional

Cowardin classification code of the wetland polygon containing the site coordinate. Null when the site is not inside one.

Type:string | null

On-site wetland type

on_site_wetland_type

Optional

Plain-English NWI type of the wetland polygon containing the site coordinate.

Type:string | null

On-site wetland acres

on_site_wetland_acres

Optional

NWI-reported acreage of the wetland polygon containing the site coordinate.

Type:number | null

On-site Cowardin system

on_site_system_name

Optional

Cowardin system of the on-site polygon (Palustrine, Lacustrine, Riverine, Estuarine, Marine) from the NWI code table.

Type:string | null

On-site Cowardin class

on_site_class_name

Optional

Cowardin class of the on-site polygon, e.g. Emergent, Forested, Scrub-Shrub, Unconsolidated Bottom.

Type:string | null

On-site water regime

on_site_water_regime_name

Optional

Cowardin water regime of the on-site polygon, e.g. Seasonally Flooded, Permanently Flooded, Irregularly Flooded.

Type:string | null

On-site NWI OBJECTID

on_site_objectid

Optional

NWI OBJECTID of the polygon containing the site coordinate, for cross-reference against the Wetlands Mapper.

Type:integer | null

Nearest wetland distance (m)

nearest_wetland_distance_m

Optional

Measured distance in metres from the site coordinate to the boundary of the nearest NWI wetland polygon. 0 when the site is inside one. Null when no wetland lies within the nearest-search radius or the search was skipped. Always read distance_method with this value.

Type:number | null

Nearest distance lower bound (m)

nearest_wetland_distance_lower_bound_m

Optional

Lower bound established by the server-side distance bisection. The true distance lies between this and the reported value plus the tolerance.

Type:number | null

Nearest distance tolerance (m)

nearest_wetland_distance_tolerance_m

Optional

Accuracy envelope of the reported distance, in metres: the polygon generalization tolerance for a geometry_measured value, or the bisection bracket width for a ring_bisection value.

Type:number | null

Nearest wetland bearing

nearest_wetland_bearing_deg

Optional

Compass bearing in degrees (0-360, 0 = north) from the site to the closest point on the nearest wetland. Null when the distance came from the bisection only.

Type:number | null

Nearest wetland direction

nearest_wetland_direction

Optional

16-point compass label for nearest_wetland_bearing_deg, e.g. N, ENE, SSW.

Type:string | null

Nearest wetland acres

nearest_wetland_acres

Optional

NWI-reported acreage of the nearest wetland polygon.

Type:number | null

Nearest NWI OBJECTID

nearest_wetland_objectid

Optional

NWI OBJECTID of the nearest wetland polygon.

Type:integer | null

Nearest Cowardin system

nearest_wetland_system_name

Optional

Cowardin system of the nearest wetland polygon.

Type:string | null

Nearest Cowardin subsystem

nearest_wetland_subsystem_name

Optional

Cowardin subsystem of the nearest polygon, e.g. Limnetic, Littoral, Intertidal, Lower Perennial. Blank for Palustrine, which has no subsystem.

Type:string | null

Nearest Cowardin class

nearest_wetland_class_name

Optional

Cowardin class of the nearest wetland polygon.

Type:string | null

Nearest Cowardin subclass

nearest_wetland_subclass_name

Optional

Cowardin subclass of the nearest polygon, e.g. Persistent, Broad-Leaved Deciduous, Needle-Leaved Evergreen.

Type:string | null

Nearest water regime

nearest_wetland_water_regime_name

Optional

Cowardin water regime of the nearest wetland polygon.

Type:string | null

Nearest water regime subgroup

nearest_wetland_water_regime_subgroup

Optional

Nontidal, Saltwater Tidal or Freshwater Tidal for the nearest polygon. Tidal waters are categorically waters of the United States.

Type:string | null

Nearest special modifiers

nearest_wetland_modifiers

Optional

Cowardin special modifiers on the nearest polygon, e.g. Excavated, Diked/Impounded, Farmed, Partially Drained/Ditched, Beaver.

Type:(string | null)[] | null

Nearest within search radius

nearest_wetland_within_search_radius

Optional

True when a wetland was found inside nearest_search_radius_m, false when the search completed and found none, null when the search did not run.

Type:boolean | null

Nearest search radius (m)

nearest_search_radius_m

Optional

Radius in metres searched for the nearest wetland. Independent of radius_meters, so a site can read "no wetland within 300 m" and still report the closest one 1,391 m away.

Type:integer | null

Distance method

distance_method

Optional

How nearest_wetland_distance_m was produced: point_in_polygon (exact, site is inside), geometry_measured (measured against the polygon boundary in WGS84), ring_bisection (bracketed by server-side distance queries, upper bound reported), none_within_search_radius, skipped or unavailable. A proxy is never reported as a measurement.

Type:string | null

Nearest basis

nearest_basis

Optional

One sentence explaining exactly how the nearest wetland was resolved, for the audit trail.

Type:string | null

Primary code by acreage

primary_wetland_code_by_acreage

Optional

Cowardin code of the LARGEST-ACREAGE wetland within the radius. This is what v1.0 reported in nearest_wetland_code; it is preserved here under its true name.

Type:string | null

Primary type by acreage

primary_wetland_type_by_acreage

Optional

Plain-English type of the largest-acreage wetland within the radius.

Type:string | null

Primary wetland acres

primary_wetland_acres

Optional

Acreage of the largest-acreage wetland within the radius.

Type:number | null

Cowardin system names

cowardin_system_names

Optional

Authoritative Cowardin system names present within the radius, from the NWI code table join: Palustrine, Lacustrine, Riverine, Estuarine, Marine.

Type:(string | null)[] | null

Cowardin subsystem names

cowardin_subsystem_names

Optional

Cowardin subsystems present within the radius: Limnetic, Littoral, Subtidal, Intertidal, Tidal, Lower Perennial, Upper Perennial, Intermittent.

Type:(string | null)[] | null

Cowardin class names

cowardin_class_names

Optional

Cowardin classes present within the radius: Emergent, Forested, Scrub-Shrub, Unconsolidated Bottom, Aquatic Bed, Unconsolidated Shore, Rocky Shore, Reef, Streambed, Rock Bottom, Moss-Lichen Wetland.

Type:(string | null)[] | null

Cowardin subclass names

cowardin_subclass_names

Optional

Cowardin subclasses present within the radius, e.g. Persistent, Broad-Leaved Deciduous, Needle-Leaved Evergreen. This is the vegetation detail a delineator needs.

Type:(string | null)[] | null

Cowardin split class names

cowardin_split_class_names

Optional

Second class of any split-class polygon (a code like PFO2/SS3C is Forested over Scrub-Shrub). Present on real mixed-vegetation mapping units.

Type:(string | null)[] | null

Water regime names

cowardin_water_regime_names

Optional

Cowardin water regimes present within the radius, e.g. Temporary Flooded, Seasonally Flooded, Semipermanently Flooded, Permanently Flooded, Irregularly Flooded. This drives hydrology expectations on a delineation.

Type:(string | null)[] | null

Water regime subgroups

cowardin_water_regime_subgroups

Optional

Nontidal, Saltwater Tidal and/or Freshwater Tidal across the radius.

Type:(string | null)[] | null

Special modifiers

cowardin_special_modifiers

Optional

Cowardin special modifiers present within the radius: Excavated, Diked/Impounded, Farmed, Partially Drained/Ditched, Artificial Substrate, Spoil, Beaver. These bear directly on whether a feature is jurisdictional.

Type:(string | null)[] | null

Acres by wetland type

acres_by_wetland_type

Optional

Per-type breakdown within the radius: [{ wetland_type, count, acres }], sorted by acreage. Empty when the feature set was truncated.

Type:object[] | null

Acres by Cowardin system

acres_by_system

Optional

Per-system breakdown within the radius: [{ system_name, count, acres }], sorted by acreage. Empty when the feature set was truncated.

Type:object[] | null

Palustrine acres

palustrine_acres

Optional

Total Palustrine (marsh, swamp, bog, pond) acreage within the radius. Null when the feature set was truncated.

Type:number | null

Lacustrine acres

lacustrine_acres

Optional

Total Lacustrine (lake and reservoir) acreage within the radius.

Type:number | null

Riverine acres

riverine_acres

Optional

Total Riverine (river and stream channel) acreage within the radius.

Type:number | null

Estuarine acres

estuarine_acres

Optional

Total Estuarine (tidal, river-meets-sea) acreage within the radius.

Type:number | null

Marine acres

marine_acres

Optional

Total Marine (open ocean and coastline) acreage within the radius.

Type:number | null

Largest wetland acres

largest_wetland_acres

Optional

Acreage of the single largest wetland polygon within the radius.

Type:number | null

Smallest wetland acres

smallest_wetland_acres

Optional

Acreage of the single smallest wetland polygon within the radius. Small isolated Palustrine features are the ones most likely to be contested post-Sackett.

Type:number | null

Tidal wetland present

tidal_wetland_present

Optional

True when an Estuarine or Marine system, or any tidal water regime, is mapped within the radius. NULL when the radius query was unavailable.

Type:boolean | null

Deepwater habitat present

deepwater_habitat_present

Optional

True when a Cowardin deepwater habitat (Lacustrine Limnetic, Marine or Estuarine Subtidal, or perennial Riverine channel) is mapped within the radius. Deepwater habitats are waters of the United States rather than wetlands, and carry a different Section 404 posture.

Type:boolean | null

Excavated or impounded present

excavated_or_impounded_present

Optional

True when a mapped feature carries an Excavated, Diked/Impounded, Artificial Substrate, Spoil or Artificially Flooded modifier.

Type:boolean | null

Farmed or drained present

farmed_or_drained_present

Optional

True when a mapped feature carries a Farmed or Partially Drained/Ditched modifier. Prior-converted cropland may be excluded from Section 404 jurisdiction.

Type:boolean | null

Jurisdictional likelihood

jurisdictional_likelihood

Optional

Screening-level likelihood that a Section 404 water is present at or beside the site: high, moderate, low, or none_mapped. NULL when any contributing query was unavailable. Read jurisdictional_basis for the reasoning. Not a jurisdictional determination.

Type:string | null

Jurisdictional basis

jurisdictional_basis

Optional

The specific facts that produced jurisdictional_likelihood, one sentence each - the audit trail a reviewer can check.

Type:(string | null)[] | null

Delineation recommended

delineation_recommended

Optional

True when the screen indicates a formal wetland delineation is warranted before ground disturbance. NULL when the screen could not be completed.

Type:boolean | null

Section 404 basis

section_404_basis

Optional

The specific facts behind section_404_flag, including the caveat that a false flag applies only to the stated radius.

Type:(string | null)[] | null

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