Buena Vista County, IA zoning map, flood zone and property lines by address
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Towns in Buena Vista County: Storm Lake, Alta.
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 Buena Vista County has 41 FIRM panels, the newest effective October 2022; 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 Buena Vista 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 Iowa county parcel layers (each county publishes its own), so a Buena Vista lot shows the same lines the county assessor draws. Buena Vista County covers about 367,935 acres of land and 3,410 acres of water.
Mapped lines are approximate. The Buena Vista County assessor keeps the parcel record (Buena Vista County website); a licensed surveyor sets the true corners.
Zoning
Buena Vista County zones its unincorporated land, and Storm Lake, Alta each zone the land inside their limits. ParcelSheet shows the use the county assessor lists for the lot and links the county zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Iowa's county zoning law (Iowa Code Chapter 335), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Buena Vista lot can add one depends on its district; the county zoning 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. Buena Vista County is soil survey area IA021, Buena Vista County, Iowa, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Buena Vista County needs a permit from the Buena Vista County environmental health department (county board of health, under Iowa Department of Natural Resources rules).
Setbacks
Setbacks in Buena Vista 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 Storm Lake and Alta for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Buena Vista lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Buena Vista 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 Buena Vista County has 41 panels, the newest effective October 2022. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Buena Vista County?
Open the Iowa map, type the address, and the parcel outline from the Buena Vista 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 Buena Vista County?
Zoning in Buena Vista County is set by the county for unincorporated land and by each city (such as Storm Lake, Alta) 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 Buena Vista County?
Under Iowa's county zoning law (Iowa Code Chapter 335), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Buena Vista 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 Buena Vista County?
Yes. A new or changed septic system in Buena Vista County needs a permit from the Buena Vista County environmental health department (county board of health, under Iowa Department of Natural Resources rules). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area IA021 (Buena Vista County, Iowa).
What can I build on 5 acres in Buena Vista County?
Zoning in Buena Vista County is set by the county for unincorporated land and each city inside its own limits (such as Storm Lake, Alta). 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 Buena Vista County website.
What are the residential setbacks in Buena Vista County (2026)?
Setbacks in Buena Vista 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 Buena Vista County website.
Next to Buena Vista County: Cherokee County, Clay County, O'Brien County, Pocahontas County, Sac County.
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