Okanogan County, WA zoning map, flood zone and property lines by address
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Towns in Okanogan County: Omak, Okanogan, Brewster.
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 20 FIRM panels covering Okanogan County, the newest effective February 2009; 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 an Okanogan 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 Washington Technology Solutions (WaTech), statewide parcels from the counties, so an Okanogan lot shows the same lines the county assessor draws. Okanogan County covers about 3,370,363 acres of land and 29,760 acres of water.
Mapped lines are approximate. The Okanogan County assessor keeps the parcel record (Okanogan County website); a licensed surveyor sets the true corners.
Zoning
Okanogan County zones its unincorporated land, and Omak, Okanogan, Brewster each zone the land inside their limits. ParcelSheet shows the use the county assessor lists for the lot and links the county planning department for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Washington's Planning Enabling Act and Growth Management Act (Revised Code of Washington Chapters 36.70 and 36.70A), local governments can allow an accessory dwelling unit on a lot with a house. Whether an Okanogan lot can add one depends on its district; the county planning department 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. Okanogan County is soil survey area WA649, Okanogan County Area, Washington, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Okanogan County needs a permit from the Okanogan County health department (local health jurisdiction, under Washington State Department of Health on site sewage rules).
Setbacks
Setbacks in Okanogan 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 Omak, Okanogan, Brewster for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near an Okanogan lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Okanogan County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 20 flood map panels covering Okanogan County, the newest effective February 2009. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Okanogan County?
Open the Washington map, type the address, and the parcel outline from the Okanogan County assessor 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 Okanogan County?
Zoning in Okanogan County is set by the county for unincorporated land and by each city (such as Omak, Okanogan) inside its own limits. ParcelSheet shows the use code the county assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Okanogan County?
Under Washington's Planning Enabling Act and Growth Management Act (Revised Code of Washington Chapters 36.70 and 36.70A), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Okanogan 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 Okanogan County?
Yes. A new or changed septic system in Okanogan County needs a permit from the Okanogan County health department (local health jurisdiction, under Washington State Department of Health on site sewage rules). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area WA649 (Okanogan County Area, Washington).
What can I build on 5 acres in Okanogan County?
Zoning in Okanogan County is set by the county for unincorporated land and each city inside its own limits (such as Omak, Okanogan). 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 Okanogan County website.
What are the residential setbacks in Okanogan County (2026)?
Setbacks in Okanogan 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 Okanogan County website.
Next to Okanogan County: Chelan County, Douglas County, Ferry County, Grant County, Lincoln County, Skagit County, Whatcom County.
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