Walla Walla County, WA zoning map, flood zone and property lines by address
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Towns in Walla Walla County: Walla Walla, College Place, Burbank.
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 12 FIRM panels covering Walla Walla County, the newest effective September 2010; 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 Walla Walla 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 Walla Walla lot shows the same lines the county assessor draws. Walla Walla County covers about 812,827 acres of land and 18,510 acres of water.
Mapped lines are approximate. The Walla Walla County assessor keeps the parcel record (Walla Walla County website); a licensed surveyor sets the true corners.
Zoning
Walla Walla County zones its unincorporated land, and Walla Walla, College Place 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 Walla Walla 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. Walla Walla County is soil survey area WA671, Walla Walla County Area, Washington, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Walla Walla County needs a permit from the Walla Walla County health department (local health jurisdiction, under Washington State Department of Health on site sewage rules).
Setbacks
Setbacks in Walla Walla 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 Walla Walla and College Place for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Walla Walla lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Walla Walla County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 12 flood map panels covering Walla Walla County, the newest effective September 2010. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Walla Walla County?
Open the Washington map, type the address, and the parcel outline from the Walla Walla 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 Walla Walla County?
Zoning in Walla Walla County is set by the county for unincorporated land and by each city (such as Walla Walla, College Place) 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 Walla Walla 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 Walla Walla 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 Walla Walla County?
Yes. A new or changed septic system in Walla Walla County needs a permit from the Walla Walla 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 WA671 (Walla Walla County Area, Washington).
What can I build on 5 acres in Walla Walla County?
Zoning in Walla Walla County is set by the county for unincorporated land and each city inside its own limits (such as Walla Walla, College Place). 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 Walla Walla County website.
What are the residential setbacks in Walla Walla County (2026)?
Setbacks in Walla Walla 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 Walla Walla County website.
Next to Walla Walla County: Benton County, Columbia County, Franklin County.
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