Frequently Asked Questions

You can look up any US address using our free address lookup tool. Properties in Zone AE, VE, AO, or AH are in a Special Flood Hazard Area (SFHA) and face the highest flood risk. You can also check the official FEMA Flood Map Service Center at msc.fema.gov.

Zone X means minimal flood hazard — you're outside the 500-year floodplain and flood insurance is not federally required. However, floods can occur anywhere. About 25% of all flood insurance claims come from outside high-risk flood zones. Flood insurance is available and often inexpensive in Zone X areas.

If your property is in a SFHA (Zone AE, VE, AO, or AH) and has a federally-backed mortgage (FHA, VA, USDA, Fannie Mae, Freddie Mac), federal law requires you to maintain flood insurance. Coverage is available through the NFIP or private insurers. Average NFIP premiums are around $700–900/year nationally, but vary widely based on zone, elevation, and coverage amount.

California faces very high seismic risk due to the San Andreas Fault system and many smaller faults. Southern California (Los Angeles, San Diego) and the San Francisco Bay Area are among the highest-risk areas in the contiguous US. See our Los Angeles hazard profile and San Francisco hazard profile.

The Cascadia Subduction Zone is a 700-mile fault off the Pacific Northwest coast capable of producing a M8.7–9.2 earthquake. The last full rupture was in January 1700. This threat affects Oregon, Washington, and northern California. See the earthquake overview for more.

The USFS Wildfire Hazard Potential (WHP) measures the relative potential for wildfire that would be difficult to control. It integrates fuel conditions (vegetation type and dryness), topography, and historical fire weather data. Scores range from low (0–24) to very high (75–100).

FEMA flood zone data is based on the latest available FIRM maps — these are updated periodically by FEMA and may not reflect the most recent map amendments. Earthquake data is sourced from the USGS API and loaded from the past 5 years of M4.0+ events. Wildfire Hazard Potential data is the latest USFS WHP dataset. For official, up-to-date flood determinations, consult FEMA's Flood Map Service Center.

No — HazardProfile provides general risk information for educational purposes only. For official flood zone determinations required for mortgage or insurance, you need a certified flood determination from an authorized source. Always consult with your lender, insurer, or a licensed professional for official determinations.