Lyon County, NV zoning map, flood zone and property lines by address
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Towns in Lyon County: Fernley, Dayton, Silver Springs.
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 Lyon County has 99 FIRM panels, the newest effective October 2016; 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 Lyon 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 Nevada Division of Water Resources, county parcels in Nevada, so a Lyon lot shows the same lines the county assessor draws. Lyon County covers about 1,281,954 acres of land and 14,700 acres of water.
Mapped lines are approximate. The Lyon County assessor keeps the parcel record (Lyon County website); a licensed surveyor sets the true corners.
Zoning
Lyon County zones its unincorporated land, and Fernley zones the land inside its 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 Nevada's planning and zoning law (Nevada Revised Statutes Chapter 278), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Lyon 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. Lyon County is soil survey area NV625, Lyon County Area, Nevada, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Lyon County needs a permit from the Lyon County health authority (Southern Nevada Health District in Clark County, Northern Nevada Public Health in Washoe County, the state environmental health section in most other counties).
Setbacks
Setbacks in Lyon 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 Fernley for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Lyon lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Lyon 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 Lyon County has 99 panels, the newest effective October 2016. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Lyon County?
Open the Nevada map, type the address, and the parcel outline from the Lyon 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 Lyon County?
Zoning in Lyon County is set by the county for unincorporated land and by each city (such as Fernley) 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 Lyon County?
Under Nevada's planning and zoning law (Nevada Revised Statutes Chapter 278), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Lyon 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 Lyon County?
Yes. A new or changed septic system in Lyon County needs a permit from the Lyon County health authority (Southern Nevada Health District in Clark County, Northern Nevada Public Health in Washoe County, the state environmental health section in most other counties). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area NV625 (Lyon County Area, Nevada).
What can I build on 5 acres in Lyon County?
Zoning in Lyon County is set by the county for unincorporated land and each city inside its own limits (such as Fernley). 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 Lyon County website.
What are the residential setbacks in Lyon County (2026)?
Setbacks in Lyon 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 Lyon County website.
Next to Lyon County: Churchill County, Douglas County, Mineral County, Storey County, Washoe County, Carson City.
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