FEMA has updated the flood maps for Butte County, and the actual flood-zone changes are concentrated in north Chico around Rock Creek and Kiefer Slough, and in Nord. Butte County estimates the new maps take effect around January 8, 2027. If you are buying near those areas, check the address on FEMA's map, ask your lender whether flood insurance will be required, and get an insurance quote before you remove contingencies.
This is a fast-moving topic, so confirm dates and details with Butte County and FEMA. I am not an insurance agent, and this is general information.
What changed in the Chico flood maps?
FEMA released preliminary Flood Insurance Rate Maps for Butte County and the City of Chico, with a 90-day comment and appeal period that ran from December 3, 2025 to March 3, 2026, according to local news coverage. Every map panel in the county gets a new date, but the real zone changes are in north Chico (around Rock Creek and Kiefer Slough) and Nord. Some areas that flood but were not previously mapped as flood zones are now added. For the first time, the maps also include base flood elevations in areas that had only approximate "A" zones. Those areas shift to "AE" zones.
The county's page says the appeal period has closed. It estimates the maps become effective around January 8, 2027, and that the Board of Supervisors will consider local action in fall 2026 so residents keep access to federally backed flood insurance.
Does a new flood zone mean the house has flooded?
No. The county notes that a new designation does not necessarily mean the property has physically changed or has flooded. It means the mapped risk changed.
Will I be required to buy flood insurance?
If the property is in a mapped Special Flood Hazard Area and the loan comes from a federally regulated or insured lender, federal law generally requires flood insurance. Your lender decides whether it applies and will notify you. Buyers who pay cash are not subject to that requirement, but insurance is still strongly recommended, and a lender may require it regardless. Ask for a quote early, because the cost belongs in your monthly budget. See the monthly cost of owning a home in Chico.
Do I have to raise or rebuild an existing home?
Generally no. The county says a map change alone does not require elevating or rebuilding an existing home, and local news coverage describes existing homes as mostly grandfathered in. Future construction, additions, substantial improvements, substantial-damage repairs, or grading may have floodplain requirements. Improvements worth more than 50% of the home's current market value would require the whole structure to meet current floodplain rules. Contact Butte County or the City of Chico before starting work in a mapped flood hazard area.
What if I think the map is wrong for my property?
The county says that since the appeal period has closed, an owner can still apply to FEMA for a Letter of Map Amendment (LOMA) if the property is incorrectly in a Special Flood Hazard Area. A standard LOMA request has no FEMA fee, but you must provide property, mapping and elevation information, which may require a licensed surveyor or engineer. Properties raised with fill may need a different request (LOMR-F).
What should buyers check on a Chico address?
- FEMA's map. Search the address in FEMA's Flood Map Service Center and note the zone.
- Insurance quote. Get a flood insurance quote and a homeowners quote before your contingencies end.
- Elevation certificate. Ask the seller whether one exists. Owners may need one to get flood insurance.
- Seller disclosures. California sellers disclose known flooding and drainage problems, and the Natural Hazard Disclosure report states whether the property is in a mapped flood zone.
- Inspection. Ask your inspector about grading, drainage and past water intrusion. See the Butte County inspection process.
- Fire zone too. Flood is separate from wildfire risk. See the wildfire and fire zone guide.
General information, not insurance, legal or financial advice. Map dates and requirements can change. Confirm with FEMA, Butte County, your lender and an insurance agent.
Frequently Asked Questions
Which parts of Chico are affected by the FEMA flood map update?
According to local news coverage, the actual flood-zone changes are in north Chico around Rock Creek and Kiefer Slough, and in Nord. Look up the specific address in FEMA's Flood Map Service Center to see its zone.
When do the new Butte County flood maps take effect?
Butte County estimates around January 8, 2027, following FEMA's process. Confirm the date with the county.
Do I need flood insurance to buy a house in Chico?
Only if the property is in a mapped Special Flood Hazard Area and your loan is from a federally regulated or insured lender, in which case federal law generally requires it. Your lender will tell you. Cash buyers are not required to buy it, but it is still strongly recommended.
Can I have my property removed from a flood zone?
You can apply to FEMA for a Letter of Map Amendment (LOMA) if you believe the property is incorrectly mapped. It may require surveyor or engineer elevation data.
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