Penobscot County, ME zoning map, flood zone and property lines by address
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Towns in Penobscot County: Orono, Brewer, Old Town.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Penobscot County has 211 FIRM panels, the newest effective July 2023; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Penobscot house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Maine GeoLibrary parcels, organized towns, so a Penobscot lot shows the same lines the town assessor draws. Penobscot County covers about 2,174,108 acres of land and 102,395 acres of water.
Mapped lines are approximate. The town assessors in Penobscot County keep the parcel record (Penobscot County website); a licensed surveyor sets the true corners.
Zoning
In Maine zoning is set by each town and city, and the state Land Use Planning Commission in the unorganized territory, not by the county: in Penobscot County, Brewer, Old Town each zone the land inside their limits. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the town code enforcement office has the district, the uses it allows and the lot size it needs. The Penobscot County website lists the county's municipalities.
ADU and guest houses
Under Maine's municipal zoning law (Maine Revised Statutes Title 30-A, section 4352), each town and city, and the state Land Use Planning Commission in the unorganized territory can allow an accessory dwelling unit on a lot with a house. Whether a Penobscot lot can add one depends on its district; the town code enforcement office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Penobscot County is soil survey area ME612, Penobscot County, Maine, Southern Part, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Penobscot County needs a permit from the town's local plumbing inspector (Maine CDC subsurface wastewater program).
Setbacks
Setbacks in Penobscot County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the town code enforcement office gives them for the lot's district, and Brewer and Old Town for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Penobscot lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Penobscot County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Penobscot County has 211 panels, the newest effective July 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Penobscot County?
Open the Maine map, type the address, and the parcel outline from the town assessors in Penobscot County shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Penobscot County?
Zoning in Penobscot County is set by each town and city, and the state Land Use Planning Commission in the unorganized territory (such as Brewer, Old Town), not by the county. ParcelSheet shows the use code on the parcel record and names the municipality; the town code enforcement office has the final word.
Can I build an ADU in Penobscot County?
Under Maine's municipal zoning law (Maine Revised Statutes Title 30-A, section 4352), each town and city, and the state Land Use Planning Commission in the unorganized territory can allow an accessory dwelling unit, and each sets its own rules. In Penobscot County ask the town code enforcement office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Penobscot County?
Yes. A new or changed septic system in Penobscot County needs a permit from the town's local plumbing inspector (Maine CDC subsurface wastewater program). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area ME612 (Penobscot County, Maine, Southern Part).
What can I build on 5 acres in Penobscot County?
Zoning in Penobscot County is set by each town and city, and the state Land Use Planning Commission in the unorganized territory, not the county (such as Brewer, Old Town). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the town code enforcement office has the district and its rules. See the Penobscot County website.
What are the residential setbacks in Penobscot County (2026)?
Setbacks in Penobscot County come from the zoning code of the municipality the lot sits in: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the town code enforcement office gives them for the district. See the Penobscot County website.
Next to Penobscot County: Aroostook County, Hancock County, Piscataquis County, Somerset County, Waldo County, Washington County.
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