Washington County, ME zoning map, flood zone and property lines by address
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Towns in Washington County: Jonesport, East Machias, Milbridge.
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 Washington County has 461 FIRM panels, the newest effective July 2017; coastal V zones, where waves add to the flood, are mapped along its shore.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Washington 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 Washington lot shows the same lines the town assessor draws. Washington County covers about 1,640,145 acres of land and 444,703 acres of water.
Mapped lines are approximate. The town assessors in Washington County keep the parcel record (Washington 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. 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 Washington 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 Washington 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. Washington County is soil survey area ME617, Washington County Area, Maine, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Washington County needs a permit from the town's local plumbing inspector (Maine CDC subsurface wastewater program).
Setbacks
Setbacks in Washington 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.
Hazards that apply
- Storm surge. Washington County has coastal V zones on its FEMA map, so storm surge reaches its shore. The county's evacuation zones are on its emergency management site; ParcelSheet shows the FEMA zone and the 3 ft sea level rise map at the lot.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Washington lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Washington 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 Washington County has 461 panels, the newest effective July 2017. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Washington County?
Open the Maine map, type the address, and the parcel outline from the town assessors in Washington 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 Washington County?
Zoning in Washington County is set by each town and city, and the state Land Use Planning Commission in the unorganized territory, 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 Washington 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 Washington 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 Washington County?
Yes. A new or changed septic system in Washington 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 ME617 (Washington County Area, Maine).
What can I build on 5 acres in Washington County?
Zoning in Washington County is set by each town and city, and the state Land Use Planning Commission in the unorganized territory, not the county. 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 Washington County website.
What are the residential setbacks in Washington County (2026)?
Setbacks in Washington 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 Washington County website.
Next to Washington County: Aroostook County, Hancock County, Penobscot County.
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