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Vermont Act 250 Tier Map Data Standard

Version 1.2 | March 11, 2026

Purpose

Act 181 of 2024 required significant changes to the Act 250 program which charged the Land Use Review Board (hereafter LURB, or Board) with the development and implementation of tiered, location-based Act 250 jurisdiction rules starting in 2025. This data standard thus does the following:

  • Defines a data framework for using GIS to review municipal and regional applications for Tier 1A and Tier 1B area status, respectively, according to Act 181 of 2024.
  • Supports easy identification entity or organization to which a data set pertains
  • Enables mapping of Act 250 Tier 1A, Tier 1B, Tier 2, and Tier 3 jurisdictional areas. See applicability section for details about tiers.
  • Serves as a resource that can be extended to meet local, state, and regional planning needs.

Scope

Standard computer field names, codes, categories, and formats for spatial records of tier areas in Vermont, in accordance with Act 181 of 2024, and as mapped by Vermont's Municipalities, Regional Planning Commissions, the Land Use Review Board, reviewed and aggregated by the State of Vermont.

Applicability

This standard pertains to Tier 1A, Tier 1B, Tier 2, and Tier 3 area maps as created by Municipalities, Regional Planning Commissions, and the Land Use Review Board, reviewed and aggregated by the State of Vermont. Compliance with this standard is recommended for any municipal, regional, state, federal, or nongovernmental data manager who creates or updates geospatial data delineating Act 250 tier areas in Vermont.

Tier 1A and Tier 1B areas are comprised of one or more of the following Future Land Use (FLU) categories: Downtown Centers, Village Centers, Planned Growth Areas, and Village Areas (See Vermont Future Land Use Data Standard). Tier 3 areas are delineated by the LURB and approved through the rulemaking process.

Tiers

    • Tier 1A: Areas of Act 250 exemption. As requested by a municipality and approved by the LURB.
    • Tier 1B: Areas of Act 250 exemption for housing development of up to 50 units on a lot of 10 acres or less. As requested by a Regional Planning Commission and approved by the LURB.
    • Tier 2: Areas subject to Act 250. By default, areas not Tier 1A/1B or Tier 3.
    • Tier 3: Areas of critical natural resources subject to enhanced Act 250 jurisdiction. Delineated by the LURB. Approved via the rulemaking process.

NOTE: There may be cases in which Tier 1A or Tier 1B status is proposed for only a subset of one of the four eligible FLU map areas. Therefore, Tier 1A and Tier 1B data layer submissions may include boundaries that are not entirely coincident with the underlying Downtown Centers, Village Centers, Planned Growth Areas, and Village Areas boundaries.

Specifications

Data Format

The tier map data set must be stored and maintained within ArcGIS Online Hosted Feature Layer(s)/View(s). It can be served via any suitable format protocol e.g., ArcGIS Online feature layer, REST, etc.

Schema

Domains

Tier (TIER_AREA)

Submitter (SUBMITTER)

Version from Submitter (TIER_VERS)

Regional Planning Commissions (RPC)

2-character codes representing Regional Planning Commissions from the most current Vermont Geographic Area Names and Codes Standard are to be used. As of November 2025, these are:

Land Use Review Board Status (LURBSTATUS)

GEOID (GEOID)

Data will be assigned unique identifiers per the Vermont Geographic Area Names and Codes Standard by ANR/ACCD GIS support staff upon submittal to the State. A concurrent update to the Names and Codes standard is expected and will add a new code type to reflect a concatenation of TOWNGEOID and VILLGEOID fields, likely to be called TVGEOID. This new field will likely be the code to use for zoning geometries that intersect administrative jurisdictions, enabling stable identification of applicable jurisdictions.

Combined Town/Village Codes

Spatial Reference

The tier map data set, in its master-copy form, must be in the current version of Vermont State Plane Coordinate System. When the data set is exported or copied for provision to external entities, its spatial reference properties must be set (e.g., shapefiles must have .prj files).

Submittals

There are several stages of data submittals given the tier area review and approval process. These stages are summarized as follows:

  • Pre-application
  • Application
  • Amendment

Municipalities are not eligible to apply for minor map amendments that would change Tier 1A status.

Naming

Layers that compose a tier map dataset must meet the following naming convention specification.

Hosted Feature Layer Naming for RPCs and Municipalities

[RPCCODE]_TIERMAP_ALL_poly_SP_[YYYY]

[TOWNNAME]_TIERMAP_ALL_poly_SP_[YYYY]

Statewide Version Layer (State)

VT_TIERMAP_poly_SP_[YYYY]

Statewide Approved TIER Map (Open Data, State)

FS_VCGI_OPENDATA_Landuse_TIERMAP_poly_[YYYY]

Metadata

When the tier map data set is exported or copied for provision to external entities in file form (e.g., file geodatabase), it must be accompanied by metadata that conforms to the Vermont GIS Metadata Standard.

The metadata abstract or the ArcGIS Online hosted feature layers item summary and description must have conspicuous content that indicates the approval date by the LURB and the status that the data set models. See information in the data fields section for more information on status.

Data Template

VCGI provides data templates that can be used as starting points for utilizing this standard. A data template will be available here shortly after the final standard is approved by the EGC.

Updates and History

Date Notes
March 11, 2026 Version 1.2 / 2025 Adopted by the Enterprise GIS Consortium
November 12, 2025 Version 1.2 / 2025 Draft for Enterprise GIS Consortium review and open to 30 day public comment
November 4, 2025 Version 1.1 First draft data standard language
October 17, 2025 Version 1.0 Draft schema created

Statutory Authority

The Vermont Center for Geographic Information (VCGI) has the statutory authority to craft and adopt Vermont GIS standards and guidelines. The State’s Enterprise GIS Consortium (EGC) has been established as the organization responsible for reviewing and approving Vermont GIS standards crafted by VCGI (in collaboration with the Vermont GIS Community). The standard will be adopted according to the EGC Procedure.