Carter County, MT zoning map, flood zone and property lines by address
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Towns in Carter County: Ekalaka.
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 has 9 FIRM panels covering Carter County, the newest effective April 2016; 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 Carter 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 Montana State Library, Montana Cadastral (MSDI), from Department of Revenue records, so a Carter lot shows the same lines the Montana Department of Revenue draws. Carter County covers about 2,137,905 acres of land and 4,819 acres of water.
Mapped lines are approximate. The Montana Department of Revenue keeps the parcel record (Carter County website); a licensed surveyor sets the true corners.
Zoning
Carter County zones its unincorporated land, and Ekalaka zones the land inside its limits. ParcelSheet shows the use the Montana Department of Revenue lists for the lot and links the county planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Montana's county zoning laws (Montana Code Annotated Title 76, Chapter 2, Parts 1 and 2), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Carter lot can add one depends on its district; the county planning 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. Carter County is soil survey area MT011, Carter County, Montana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Carter County needs a permit from the Carter County sanitarian (local health department, under Montana DEQ standards).
Setbacks
Setbacks in Carter County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and Ekalaka for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Carter lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Carter County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 9 flood map panels covering Carter County, the newest effective April 2016. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Carter County?
Open the Montana map, type the address, and the parcel outline from the Montana Department of Revenue 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 Carter County?
Zoning in Carter County is set by the county for unincorporated land and by each city (such as Ekalaka) inside its own limits. ParcelSheet shows the use code the Montana Department of Revenue lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Carter County?
Under Montana's county zoning laws (Montana Code Annotated Title 76, Chapter 2, Parts 1 and 2), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Carter County ask the zoning 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 Carter County?
Yes. A new or changed septic system in Carter County needs a permit from the Carter County sanitarian (local health department, under Montana DEQ standards). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area MT011 (Carter County, Montana).
What can I build on 5 acres in Carter County?
Zoning in Carter County is set by the county for unincorporated land and each city inside its own limits (such as Ekalaka). 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 planning office has the district and its rules. See the Carter County website.
What are the residential setbacks in Carter County (2026)?
Setbacks in Carter County come from the zoning code of the county, or of the city when the lot is inside city limits: 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 zoning office gives them for the district. See the Carter County website.
Next to Carter County: Custer County, Fallon County, Powder River County.
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