CA
LOMA and LOMR-F in Marin County, California
Marin County lies along the San Francisco Bay shoreline and the Pacific coast, with flood risk from bay tidal flooding, creek overflow, and coastal storm surge. Communities like San Rafael, Mill Valley, and Corte Madera experience flooding when atmospheric river storms produce heavy rainfall that overwhelms the narrow creek channels draining the Mount Tamalpais watershed. Sea level rise is increasing the frequency and severity of tidal flooding in low-lying bayside neighborhoods.
LOMA in Marin County
LOMAs are pursued in Marin County for properties near Corte Madera Creek, San Anselmo Creek, and other tributary floodplain edges where the county's hilly terrain provides elevation above the base flood elevation.
Read the national LOMA page →LOMR-F in Marin County
LOMR-Fs are filed in Marin County for developments where fill or grading raises structures above creek and bayside floodplains. The county's environmental regulations add complexity to LOMR-F applications involving fill placement near wetlands.
Read the national LOMR-F page →Major cities
- • San Rafael
- • Mill Valley
- • Novato
- • Corte Madera
- • San Anselmo
- • Tiburon
Common flood zones
- • Zone AE
- • Zone VE
- • Zone A
- • Zone X
Frequently asked questions about Marin County
Can a property in Marin County qualify for a FEMA LOMA?
Yes. Properties in Marin County that sit on natural high ground above the Base Flood Elevation may qualify for a LOMA. LOMAs are pursued in Marin County for properties near Corte Madera Creek, San Anselmo Creek, and other tributary floodplain edges where the county's hilly terrain provides elevation above the base flood elevation. A specialist review can confirm whether the property matches the LOMA pattern before you order new survey work.
When is a LOMR-F the right path in Marin County?
A LOMR-F applies when earthen fill created the elevation difference at the property. LOMR-Fs are filed in Marin County for developments where fill or grading raises structures above creek and bayside floodplains. The county's environmental regulations add complexity to LOMR-F applications involving fill placement near wetlands. If fill was used, packaging the file as a LOMA usually creates delay.
How long does a LOMA take in Marin County?
Timing depends on document readiness and whether the case qualifies for the faster eLOMA route. Most Marin County files move faster when the Elevation Certificate and FEMA correspondence are gathered before submission. A typical LOMA runs 6 to 12 weeks from document gathering through determination.
What does a LOMA cost in Marin County?
FEMA does not charge a filing fee for a LOMA. The primary costs are the Elevation Certificate and any professional preparation, which vary by surveyor rates in California. Most homeowners spend several hundred to low four figures total.
Does a LOMA in Marin County remove flood insurance?
A LOMA can change the federal mandatory-purchase requirement, but California lenders and carriers still make their own underwriting decisions. Many homeowners keep voluntary coverage at significantly lower Preferred Risk rates.
Which cities in Marin County see the most LOMA activity?
LOMA and LOMR-F activity in Marin County is concentrated around San Rafael, Mill Valley, Novato and surrounding areas. Common flood zones include Zone AE, Zone VE, Zone A.
Can FloodMapReview.com help with a LOMA anywhere in Marin County?
Yes. We review LOMA and LOMR-F files across all of Marin County, California. Call (281) 870-4492 to talk through an urgent file or start a guided eligibility review online.
What documents should Marin County homeowners gather first?
Start with the property address, current flood zone or lender determination, any existing Elevation Certificate or survey, prior FEMA correspondence, and a lender or insurance notice if one triggered the review. Upload what you have and a specialist will identify the next step.
Reviewed by
FloodMapReview Engineering
Licensed P.E. and CFM team, FloodMapReview.com
FloodMapReview Engineering is a team of licensed Professional Engineers and Certified Floodplain Managers who have reviewed hundreds of LOMA, LOMR-F, eLOMA, and Online LOMC files across the United States. The team specializes in helping homeowners, buyers, lenders, and surveyors navigate the FEMA flood map amendment process. FloodMapReview engineers personally review every case for eligibility, ensure Elevation Certificates and supporting documents meet FEMA standards, and guide clients from initial assessment through final determination.