Reference only. Data sourced from HUD/FHFA (2025). This site is a private entity and not affiliated with any government agency.
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Flood risk by county

National Risk Index scores attached to every county calculator.

CountyRiskScoreDetails
Alameda CountyVery High83View
Alpine CountyVery High98View
Amador CountyVery High98View
Butte CountyModerate34View
Calaveras CountyVery High98View
Colusa CountyVery High98View
Contra Costa CountyVery High83View
Del Norte CountyModerate37View
El Dorado CountyVery High81View
Fresno CountyModerate46View
Glenn CountyVery High98View
Humboldt CountyModerate43View
Imperial CountyModerate41View
Inyo CountyVery High98View
Kern CountyLow25View
Kings CountyModerate50View
Lake CountyModerate34View
Lassen CountyVery High90View
Los Angeles CountyHigh62View
Madera CountyHigh62View
Marin CountyVery High83View
Mariposa CountyVery High98View
Mendocino CountyVery High92View
Merced CountyHigh65View
Modoc CountyVery High98View
Mono CountyVery High98View
Monterey CountyVery High83View
Napa CountyHigh69View
Nevada CountyVery High92View
Orange CountyHigh62View
Placer CountyVery High81View
Plumas CountyVery High98View
Riverside CountyVery High80View
Sacramento CountyVery High81View
San Benito CountyVery High83View
San Bernardino CountyVery High80View
San Diego CountyVery High83View
San Francisco CountyVery High83View
San Joaquin CountyVery High89View
San Luis Obispo CountyVery High84View
San Mateo CountyVery High83View
Santa Barbara CountyVery High84View
Santa Clara CountyVery High83View
Santa Cruz CountyVery High84View
Shasta CountyHigh79View
Sierra CountyVery High98View
Siskiyou CountyVery High98View
Solano CountyVery High93View
Sonoma CountyVery High84View
Stanislaus CountyHigh67View
Sutter CountyVery High99View
Tehama CountyHigh79View
Trinity CountyVery High98View
Tulare CountyVery High94View
Tuolumne CountyVery High87View
Ventura CountyHigh74View
Yolo CountyVery High81View
Yuba CountyVery High99View