Pima County, AZ zoning map, flood zone and property lines by address
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Towns in Pima County: Tucson, Casas Adobes, Catalina Foothills.
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 Pima County has 299 FIRM panels, the newest effective September 2012; 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 Pima 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 Arizona county parcel layers (each county publishes its own), so a Pima lot shows the same lines the county assessor draws. Pima County covers about 5,880,763 acres of land and 1,263 acres of water.
Mapped lines are approximate. The Pima County assessor keeps the parcel record (Pima County website); a licensed surveyor sets the true corners.
Zoning
Pima County zones its unincorporated land, and Tucson zones the land inside its limits. ParcelSheet shows the use the county assessor lists for the lot and links the county planning and zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Arizona's county zoning law (Arizona Revised Statutes Title 11, Chapter 6, Article 2, starting at 11-811), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Pima lot can add one depends on its district; the county planning and 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. Pima County is soil survey area AZ669, Pima County, Arizona, Eastern Part, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Pima County needs a permit from the Pima County environmental services or health department, under authority delegated by the Arizona Department of Environmental Quality.
Setbacks
Setbacks in Pima 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 Tucson for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Pima lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Pima 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 Pima County has 299 panels, the newest effective September 2012. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Pima County?
Open the Arizona map, type the address, and the parcel outline from the Pima 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 Pima County?
Zoning in Pima County is set by the county for unincorporated land and by each city (such as Tucson) 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 Pima County?
Under Arizona's county zoning law (Arizona Revised Statutes Title 11, Chapter 6, Article 2, starting at 11-811), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Pima 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 Pima County?
Yes. A new or changed septic system in Pima County needs a permit from the Pima County environmental services or health department, under authority delegated by the Arizona Department of Environmental Quality. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area AZ669 (Pima County, Arizona, Eastern Part).
What can I build on 5 acres in Pima County?
Zoning in Pima County is set by the county for unincorporated land and each city inside its own limits (such as Tucson). 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 Pima County website.
What are the residential setbacks in Pima County (2026)?
Setbacks in Pima 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 Pima County website.
Next to Pima County: Cochise County, Graham County, Maricopa County, Pinal County, Santa Cruz County, Yuma County.
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