Maine Regional Planning Commissions: Land Use and Development

Maine's eight Regional Planning Commissions (RPCs) function as the intermediary layer between state-level land use policy and municipal planning practice, coordinating development review, zoning guidance, and infrastructure planning across multi-town regions. These bodies operate under authority granted by the Maine Legislature and serve as technical resources for municipalities that lack dedicated planning staff. Understanding how RPCs structure their authority, where their jurisdiction begins and ends, and how they interact with state agencies is essential for developers, municipal officials, and land use professionals operating anywhere in the Maine government framework.

Definition and scope

Maine's Regional Planning Commissions are quasi-governmental, nonprofit organizations established under 30-A M.R.S.A. § 4341–4350 (Maine Legislature, Title 30-A). Each RPC is organized around a defined geographic territory and governed by a board of directors drawn from member municipalities and counties. Membership is voluntary for municipalities, though the state strongly incentivizes participation through grant eligibility and technical assistance programs administered by the Maine Department of Agriculture, Conservation and Forestry and the Maine Department of Environmental Protection.

The 8 RPCs collectively cover all 16 Maine counties:

  1. Androscoggin Valley Council of Governments (AVCOG) — Androscoggin, Franklin, and Oxford counties
  2. Central Maine Growth Council (CMGC) — Kennebec and Somerset counties
  3. Eastern Maine Development Corporation (EMDC) — Penobscot, Piscataquis, and Washington counties
  4. Midcoast Regional Planning Commission (MRPC) — Knox, Lincoln, Sagadahoc, and Waldo counties
  5. Northern Maine Development Commission (NMDC) — Aroostook County
  6. Penobscot Bay Regional Planning Commission — portions of Knox and Waldo counties
  7. Southern Maine Planning and Development Commission (SMPDC) — Cumberland and York counties
  8. Hancock County Planning Commission — Hancock County

Each commission maintains its own bylaws, staffing levels, and service menus. Funding derives from a combination of member dues, state grants, federal Community Development Block Grant (CDBG) allocations administered through the Maine Department of Economic and Community Development, and fee-for-service contracts with municipalities.

Scope limitations: This page addresses Maine's RPC system exclusively. Federal land use regulations governing national parks, military installations, and federally managed lands within Maine are not covered here. Tribal land use authority exercised by the Passamaquoddy Tribe, Penobscot Nation, Maliseet Nation, and Micmac Nation is governed separately under the Maine Indian Claims Settlement Act and falls outside RPC jurisdiction. Provisions specific to the Maine Land Use Planning Commission's authority over unorganized territories are addressed separately at Maine Unorganized Territories.

How it works

RPCs do not hold regulatory authority in most land use decisions — that power resides with individual municipalities through local zoning ordinances and with the state through permit programs such as the Site Location of Development Act (38 M.R.S.A. § 481–490) administered by the Maine Department of Environmental Protection. RPCs function primarily as technical service providers, plan administrators, and regional coordinators.

The core operational functions of an RPC include:

  1. Comprehensive plan assistance — Drafting or reviewing municipal comprehensive plans to ensure consistency with the State Planning Office's Growth Management Act requirements under 30-A M.R.S.A. § 4312.
  2. Geographic Information Systems (GIS) mapping — Maintaining regional spatial data layers for transportation networks, floodplains, wetlands, and parcel boundaries.
  3. Transportation planning — Serving as designated Planning Organizations or sub-units under metropolitan and rural transportation planning processes coordinated with the Maine Department of Transportation.
  4. Economic development administration — Managing CDBG funds, revolving loan programs, and workforce housing initiatives at the regional scale.
  5. Environmental review — Providing technical comment on state permit applications affecting multi-municipality watersheds or transportation corridors.
  6. Zoning and ordinance drafting — Producing model ordinances for shoreland zoning, floodplain management, and stormwater management for member towns to adopt or adapt.

The distinction between RPCs and county government is structural: Maine counties hold limited governmental authority compared to counties in most other states, and they do not exercise land use permitting jurisdiction. RPCs fill the regional coordination gap that county government does not cover.

Common scenarios

Small municipality technical assistance: A town of fewer than 2,500 residents lacks a full-time code enforcement officer or planner. The relevant RPC provides review services under contract, assessing subdivision applications against the town's existing ordinance and state subdivision law (30-A M.R.S.A. § 4401).

Regional transportation corridor studies: A proposed arterial expansion affecting 4 municipalities triggers a corridor study. The RPC aggregates traffic data, consults with MaineDOT, and produces a unified analysis that individual towns could not fund independently.

Comprehensive plan update cycles: State law encourages municipalities to update comprehensive plans on a cycle consistent with regional growth patterns. RPCs coordinate simultaneous update processes across member municipalities to align land use designations at shared boundaries — particularly relevant in fast-growing areas around Portland, Bangor, and Auburn.

Shoreland zoning compliance: Maine's mandatory shoreland zoning program (38 M.R.S.A. § 435–449) requires all municipalities to adopt compliant ordinances. RPCs review local shoreland ordinances and flag deviations from the state's minimum guidelines before submission to DEP for approval.

Decision boundaries

Understanding which body holds final authority at each stage prevents procedural errors in development applications.

Decision Type RPC Role Final Authority
Local subdivision approval Technical review / advisory Municipal planning board
Shoreland zoning ordinance Draft assistance, pre-review Maine DEP (final approval)
Site Location of Development Act permit Regional comment Maine DEP
Statewide transportation improvement program Data and planning input MaineDOT / FHWA
Comprehensive plan certification Technical support Maine DACF / State Planning Office
Unorganized territory land use No jurisdiction Maine Land Use Planning Commission

RPCs do not issue permits, impose fines, or hold appellate authority over municipal zoning boards. A developer aggrieved by a local planning board decision appeals to the municipal board of appeals, then to Superior Court — not to the RPC. Similarly, state permit denials by DEP or MaineDOT are appealed through the Board of Environmental Protection or administrative channels, not through RPC processes.

The boundary between RPC advisory functions and binding state regulation is most frequently contested in shoreland zoning and floodplain management, where RPCs conduct pre-submission reviews but DEP holds final certification authority under state statute.

References