Short answer: A Miami property's flood zone comes from the FEMA Flood Insurance Rate Map, which Miami-Dade County says became effective on September 11, 2009, while FEMA's record for the City of Miami now lists a currently effective map date of 02/19/27. The city is NFIP community 120650, Community Rating System Class 6, worth a 20% discount inside the Special Flood Hazard Area. The City of Miami Building Department gives a written flood zone determination for $25.
Last verified: October 19, 2026, against the sources listed at the end of this page.
How is the flood zone of a Miami property checked?
A Miami flood zone is looked up by address on the Miami-Dade County flood map, or confirmed in writing by the City of Miami for a $25 fee (Miami-Dade County, Flood Zone Maps; City of Miami, Flood Information).
For that $25 the City of Miami provides, in writing, the community number, the panel number and suffix, the date of the FIRM index, the FIRM zone, the base flood elevation and the elevation data used on the FIRM (City of Miami). The information sits with the Plumbing Plans Examiner at 444 S.W. 2nd Avenue, 4th Floor, telephone (305) 416-1111, and the department also offers site visits to tell an owner whether a Miami property is in a flood zone.
Miami-Dade County's Flood Zone Hotline, 305-372-6466, confirms a property's official designation and supplies PDF map panels, and the county notes that an insurance agent can also confirm the zone (Miami-Dade County). The City of Miami page names the coastal areas, the Miami River and the city's many canals as the places that make nearby properties prone to flooding (City of Miami).
What do the flood zone letters on a Miami map mean?
On a Miami flood map, zones starting with A or V are Special Flood Hazard Areas, land FEMA expects to be flooded by the 1-percent-annual-chance flood, also called the base flood or 100-year flood (FEMA, Flood Zones glossary).
| Zone | What it means | Flood insurance purchase |
|---|---|---|
| VE | Coastal area with additional hazards from storm waves; high flooding risk | Mandatory |
| AE | Flood depths greater than three feet; moderate to high risk | Mandatory |
| AH | Shallow flooding, average depths of one to three feet | Mandatory |
| AO | Shallow flooding, usually sheet flow, 1 to 3 feet; 26% chance of flooding over a 30-year mortgage | Mandatory |
| A (unnumbered) | High risk, no detailed analysis, so no depths or base flood elevations shown | Mandatory |
| X (shaded) | Moderate hazard, between the base flood and the 0.2-percent-annual-chance (500-year) flood | Not federally required |
| X (unshaded) | Minimal hazard, above the 0.2-percent-annual-chance flood elevation | Not federally required |
| D | Possible but undetermined hazard; in Miami-Dade mostly inside Everglades National Park | Rates reflect the uncertainty |
The Miami-Dade definitions come from the county's own page for the current DFIRMs and the preliminary maps, and the X zone rows follow FEMA's glossary (Miami-Dade County; FEMA). A Zone X label in Miami is not a clean bill of health: Miami-Dade County notes that moderate-to-low-risk areas submit more than 20 percent of NFIP claims and receive one-third of all disaster assistance for flooding (Miami-Dade County).
Which FEMA flood map dates apply to Miami in 2026?
Miami-Dade County dates the current FEMA maps for the county to September 11, 2009, while FEMA's record lists the currently effective map date as 02/19/27 (Miami-Dade County, Flood Zone Maps; FEMA NFIP Community Status Book, 120650).
Miami-Dade County says FEMA periodically updates the maps, and that it published new Preliminary Flood Zone Maps for the county on February 25, 2021, and describes them as maps that may change as FEMA addresses comments and that are not currently effective (Miami-Dade County). FEMA prints the Miami date as 02/19/27 followed by a (>) sign, a date still in the future as of October 18, 2026; the two agencies' dates are stated here as each prints them.
One county page is plainly out of date. The Miami-Dade preliminary maps FAQ still says the new map could become effective as early as March 1, 2022, at the end of the 90-day comment or appeal period (Miami-Dade County, FEMA Preliminary Maps FAQ). That date is now past, and the county's main flood map page describes the preliminary maps as not currently effective (Miami-Dade County).
The Miami flood map history runs much deeper. FEMA lists September 29, 1972 as the date of the City of Miami's initial Flood Hazard Boundary Map and its initial Flood Insurance Rate Map, with the regular program date of 09/29/72 (FEMA).
What is the City of Miami NFIP community number and CRS class?
The City of Miami is NFIP community 120650 in Miami-Dade County, participates in the National Flood Insurance Program without sanction, and holds Community Rating System Class 6, effective October 1, 2022 (FEMA NFIP Community Status Book).
Class 6 carries a 20% premium discount for policies inside the Special Flood Hazard Area and 10% outside it, according to the FEMA record for Miami (FEMA). FEMA gives October 1, 1994 as the city's original entry date in that record.
The county's Class 3 rating does not cover the city. Miami-Dade County moved from Class 5 to Class 3 for a 35% discount, but only for qualified residents and businesses in the Unincorporated Municipal Service Area, on most NFIP policies issued or renewed on or after April 1, 2024 (Miami-Dade County). For a home inside the City of Miami, the class on the FEMA record is the city's Class 6 (FEMA).
How can a Miami owner track flood levels and protect a building?
The City of Miami lists three ways to protect a building: small flood walls, waterproofing walls with watertight door closures, and raising the property above the flood level (City of Miami, Flood Information).
For tracking water levels, the same Miami page points owners to a real-time Atlantic Ocean tide gauge at Virginia Key Beach (City of Miami).
The Miami page explains how to read that gauge: stage is measured in feet above an arbitrary starting point set when the gauge was installed, while elevations are in feet above sea level (City of Miami). Minor flooding means minimal or no property damage but possibly some public threat; moderate flooding means some inundation of structures and roads; major flooding means extensive inundation and significant evacuations or transfer of property to higher elevations.
One practical catch for Miami readers: the city page sends people to the gauge through a water.weather.gov hydrograph address, and as checked on October 18, 2026, that address did not load (City of Miami). The Miami Building Department at 444 S.W. 2nd Avenue remains the office named on the same page for information on protection techniques and Special Flood Hazard Areas.
When does a Miami building need an elevation certificate or flood insurance?
Elevation certificates are required in Miami for all new construction and substantial improvements, and flood insurance is required for any federally backed mortgage in a Special Flood Hazard Area (City of Miami; Miami-Dade County).
The certificate shows how high a house was built relative to its flood zone. If it shows the house is lower than required, the City of Miami applies the 50% rule: a house in a flood zone that is damaged or improved by more than 50% of its market value has to be raised to the current elevation requirement (City of Miami). The city also notes that a regular homeowner policy does not cover flood damage.
The City of Miami flood page gives two different start dates for its certificate records. One passage says the Building Department maintains elevation certificates for properties built or substantially improved since December 1992; another says the city has collected FEMA elevation certificates from builders as a permit requirement since 1995 (City of Miami). For a home built before 1995 and never substantially improved or damaged, the city page says an owner may need to hire a surveyor or ask the prior owner for the certificate; the city's line for certificate questions is 305-416-1279 during office hours. Last verified: October 18, 2026, against FEMA's NFIP record for Miami, the FEMA flood zone glossary, two Miami-Dade floodplain pages and the City of Miami flood information page.
Frequently asked questions
What is the NFIP community number for the City of Miami?
FEMA lists the City of Miami as NFIP community 120650, in Miami-Dade County, participating in the program with no sanction.
What CRS class is the City of Miami?
Class 6, effective October 1, 2022, which FEMA lists with a 20% discount inside the Special Flood Hazard Area and 10% outside it. The county's Class 3 applies only to unincorporated Miami-Dade.
When do the new FEMA flood maps take effect in Miami?
FEMA's NFIP record for the City of Miami lists a currently effective map date of 02/19/27. Miami-Dade County says the maps in effect today date from September 11, 2009.
How much does a City of Miami flood zone letter cost?
The City of Miami Building Department provides a written flood zone determination for $25, listing the community number, panel, FIRM zone and base flood elevation. The phone number is (305) 416-1111.
Is Zone X in Miami safe from flooding?
Not entirely. Miami-Dade County says moderate-to-low-risk areas, shown as Zone X, submit more than 20 percent of NFIP claims, and flood insurance is recommended there even though it is not federally required.
Sources
- FEMA, NFIP Community Status Book, community 120650 (City of Miami) https://www.fema.gov/api/open/v1/NfipCommunityStatusBook?$filter=communityIdNumber%20eq%20%27120650%27 Used for: community number, initial map dates, currently effective map date, CRS class and discounts, entry date, sanction status
- Miami-Dade County, Flood Zone Maps https://www.miamidade.gov/global/economy/building/flood-protection/flood-zone-maps.page Used for: interactive tool, hotline, zone definitions, 2009 effective date, 2021 preliminary maps, UMSA CRS Class 3, insurance requirement, moderate-risk claims
- Miami-Dade County, FEMA Preliminary Flood Zone Maps FAQ https://www.miamidade.gov/global/economy/building/flood-protection/fema-maps.page Used for: stale March 1, 2022 possible effective date
- City of Miami, Hurricane Guide, Flood Information https://www.miami.gov/My-Home-Neighborhood/Hurricane-Guide/Hurricane-Flood-Information Used for: $25 determination, Plumbing Plans Examiner contact, elevation certificates, 50% rule, flood-prone areas, certificate dates
- FEMA, Flood Zones glossary https://www.fema.gov/about/glossary/flood-zones Used for: SFHA definition, Zone X shaded and unshaded
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