Yakima County, WA zoning map, flood zone and property lines by address
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Towns in Yakima County: Yakima, Sunnyside, West Valley.
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 Yakima County has 289 FIRM panels, the newest effective October 2021; 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 Yakima 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 a Yakima lot shows the same lines the county assessor draws. Yakima County covers about 2,748,488 acres of land and 10,178 acres of water.
Mapped lines are approximate. The Yakima County assessor keeps the parcel record (Yakima County website); a licensed surveyor sets the true corners.
Zoning
Yakima County zones its unincorporated land, and Yakima, Sunnyside 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 a Yakima 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. Yakima County is soil survey area WA677, Yakima County Area, Washington, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Yakima County needs a permit from the Yakima County health department (local health jurisdiction, under Washington State Department of Health on site sewage rules).
Setbacks
Setbacks in Yakima 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 Yakima and Sunnyside for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Yakima lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Yakima 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 Yakima County has 289 panels, the newest effective October 2021. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Yakima County?
Open the Washington map, type the address, and the parcel outline from the Yakima 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 Yakima County?
Zoning in Yakima County is set by the county for unincorporated land and by each city (such as Yakima, Sunnyside) 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 Yakima 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 Yakima 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 Yakima County?
Yes. A new or changed septic system in Yakima County needs a permit from the Yakima 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 WA677 (Yakima County Area, Washington).
What can I build on 5 acres in Yakima County?
Zoning in Yakima County is set by the county for unincorporated land and each city inside its own limits (such as Yakima, Sunnyside). 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 Yakima County website.
What are the residential setbacks in Yakima County (2026)?
Setbacks in Yakima 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 Yakima County website.
Next to Yakima County: Benton County, Grant County, King County, Kittitas County, Klickitat County, Lewis County, Pierce County.
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