Las Vegas, Nevada · FEMA Region 9

Is Las Vegas in a Flood Zone?

Moderate Flood Risk

Las Vegas faces significant flash flood risk despite its desert climate. Monsoonal thunderstorms produce intense rainfall that overwhelms the valley’s natural drainage. The Clark County Regional Flood Control District has built an extensive system of channels and detention basins, but flash flooding remains a serious hazard. FEMA flood zones follow washes and channels throughout the valley.

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FEMA Flood Zones in Las Vegas

AE

100-Year Floodplain

Along Las Vegas Wash, Flamingo Wash, Tropicana Wash, and other major channels. BFE established.

AO

Shallow Flooding (Sheet Flow)

Alluvial fan areas in northwest and western Las Vegas Valley. Unpredictable flood paths during intense storms.

X (shaded)

500-Year Floodplain

Areas near improved channels and detention basins. Moderate residual risk despite infrastructure.

X (unshaded)

Minimal Risk

Higher-elevation areas and neighborhoods protected by completed flood control infrastructure.

Flood Insurance Costs in Las Vegas

  • Zone AE (wash corridors): $1,000–$3,000/year
  • Zone AO (alluvial fan): $800–$2,500/year
  • Zone X (shaded): $350–$700/year
  • Zone X (unshaded): $275–$500/year (Preferred Risk Policy)
  • Nevada has among the lowest flood insurance uptake nationally
  • Flash flood damage often exceeds expectations for a desert city

Building Requirements in Flood Zones

  • AE zones: lowest floor at or above BFE; Clark County enforces strict elevation standards
  • AO zones: lowest floor elevated above highest adjacent grade by depth shown on FIRM
  • Desert soils: caliche layers can impede drainage; engineered grading and drainage plans required
  • All new subdivisions must provide on-site retention/detention per Regional Flood Control District standards
  • Washes cannot be built over or encroached upon without Regional Flood Control District approval
  • Parking lots and commercial sites: retention basins sized for 100-year storm event

How to Check Flood Risk in Las Vegas

  1. 1

    Check your flood zone

    Enter your Las Vegas address into ReadyPermit or the Clark County Regional Flood Control District’s interactive map to see your FEMA zone and nearby wash/channel infrastructure.

  2. 2

    Understand desert flash flood risk

    Las Vegas can receive a month’s worth of rain in minutes during monsoon season (July–September). Even Zone X properties near washes can experience dangerous flooding.

  3. 3

    Get an Elevation Certificate

    Required in AE/AO zones. A Nevada-licensed surveyor documents your elevation relative to BFE or highest adjacent grade.

  4. 4

    Obtain flood insurance

    Required in AE/AO zones with federally backed mortgages. Strongly recommended near washes even in Zone X. Flash floods in Las Vegas are sudden and destructive.

  5. 5

    Review wash setback requirements

    Clark County and the cities of Las Vegas, Henderson, and North Las Vegas enforce setbacks from washes and channels. Check your property’s proximity to designated waterways.

  6. 6

    Consider mitigation

    Proper grading away from structures, retention walls, French drains, and avoiding below-grade construction reduce flash flood risk.

  7. 7

    Monitor monsoon season

    The National Weather Service Las Vegas issues flash flood watches and warnings during monsoon season. Subscribe to alerts for your area (July–September peak risk).

Frequently Asked Questions — Las Vegas Flood Zones

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