Flood Zones in Long Beach, California

FEMA Flood Insurance Rate Maps, Administered Through the City

Like every community that participates in the National Flood Insurance Program, Long Beach's flood-hazard designations run through FEMA's Flood Insurance Rate Maps (FIRMs) -- the same base system used across the country, including the Gulf and Atlantic markets covered elsewhere on this site. The City of Long Beach's own Public Works Department maintains a dedicated Flood Zone resource showing the 100-year floodplain as it appears on FEMA's currently adopted maps, and directs property owners to FEMA's Flood Map Service Center or the city directly to check a specific parcel's designation. This page does not have a confirmed, current FEMA flood zone designation for any specific Long Beach address or neighborhood, since zone boundaries are parcel-specific and can be updated when FEMA revises its maps -- a buyer should check the exact address, not assume a neighborhood-wide designation.

In practical terms, Long Beach's flood exposure concentrates around low-lying areas near Alamitos Bay, the Naples canals, the Los Angeles River outlet at the city's western edge, and the harbor and Port area itself -- rather than an open, wave-exposed ocean beach the way FEMA's higher-hazard 'V zone' (velocity zone, reflecting wave-action risk) designations typically apply along a barrier-island Atlantic or Gulf coastline. This page does not have confirmed data on what share of Long Beach parcels currently carry a V-zone versus an A-zone (still flood-prone, but without direct wave-action risk) designation, and recommends checking a specific address directly.

Tsunami Risk: A Distinct, Separately Modeled Hazard

Separate from FEMA's flood-insurance mapping, Los Angeles County maintains its own tsunami-hazard modeling, updated in 2021 with improved computer modeling of how far inland a tsunami surge could travel. That update found that a large tsunami could flood 'sizeable areas' of Long Beach and Marina del Rey to an elevation of 15 feet, with modeled flood elevations for the Port of Los Angeles and Port of Long Beach reaching 12 to 15 feet -- enough to inundate almost all of the land within the ports themselves and some of the surrounding communities. Naples Island is specifically named among the county's identified tsunami hazard zones in this modeling, a genuinely distinct fact from its FEMA flood-insurance designation and one that a canal-front buyer should understand as a separate risk layer.

This is a modeled worst-case scenario, not a prediction of any specific future event or its timing -- a tsunami capable of producing this kind of inundation would require a very large triggering earthquake, either locally on an offshore fault segment or a major Pacific-basin event thousands of miles away. Officials have noted that a local, nearby triggering rupture could produce a tsunami reaching the coast in a genuinely short window, while a distant Pacific-basin event would typically allow many hours of advance warning. This page does not have a confirmed, Long Beach-specific timeline for either scenario, and recommends reviewing the City of Long Beach's and LA County's current tsunami evacuation planning materials directly rather than assuming a generic timeline applies.

The Los Angeles River: A Real, if Underappreciated, Flood Factor

The Los Angeles River empties into the Pacific at the western edge of Long Beach, near the boundary with the Port complex. While the river's main channel through much of Los Angeles County runs through an extensively engineered, largely concrete-lined flood-control system built in the mid-20th century specifically to prevent the kind of catastrophic flooding the region saw in earlier decades, its lower reaches and outlet area remain a genuine flood-planning consideration for nearby Long Beach neighborhoods, particularly during significant winter atmospheric-river storm events. This page does not have confirmed, current data on how the LA River's flood-control performance has been assessed in recent years or what specific Long Beach neighborhoods near its outlet carry an elevated flood-zone designation as a result, and recommends checking a specific address's FEMA designation directly rather than assuming proximity to the river alone determines risk.

Naples Canals and Alamitos Bay: A Genuinely Different Water Regime

For a Naples Island or Belmont Shore buyer specifically, it's worth understanding that the Naples canals and Alamitos Bay are a managed, semi-enclosed tidal water system, not open ocean -- meaning day-to-day water levels move with the tide cycle in a generally more predictable, lower-energy way than open-coast wave action would produce, even though the same area is flagged in the county's tsunami modeling as genuinely exposed in an extreme scenario. This dual character -- calm, tidal, canal-front living most days of the year, layered against a real, if low-probability-per-year, tsunami exposure -- is a distinctive risk profile worth understanding on its own terms rather than assuming it behaves like either a purely calm lake or a fully open, wave-exposed beachfront.

See the Waterway Living page for more on what day-to-day life on the Naples canals and Alamitos Bay actually involves, separate from this flood-mapping discussion.

Flood Insurance: A Separate Purchase From Standard Homeowners Coverage

As is true nationwide, a standard California homeowners insurance policy does not cover flood damage -- flood insurance is a genuinely separate product, generally purchased either through the National Flood Insurance Program or a private flood insurance carrier. Whether flood insurance is legally required for a specific Long Beach property depends on that property's FEMA flood zone designation and, for a financed purchase, the specific lender's requirements; a property in a moderate- or low-risk zone may not require it but could still benefit from optional coverage given the tsunami-hazard modeling discussed above. See the Coastal Insurance page for the fuller picture of how flood coverage fits alongside FAIR Plan and earthquake coverage in a California homeowner's overall insurance stack.

This page does not have a confirmed, current flood insurance premium for any specific Long Beach property, since premiums depend entirely on the exact parcel's flood zone, elevation, and construction details.

What This Page Does Not Know

This page does not have a confirmed, current FEMA flood zone designation for any specific Long Beach address, confirmed data on what share of the city's parcels carry a V-zone versus A-zone designation, a confirmed Long Beach-specific tsunami-warning timeline for a near versus distant triggering earthquake, or a confirmed current flood insurance premium for any specific property.

For a specific address's flood zone status, check FEMA's Flood Map Service Center directly or contact the City of Long Beach Public Works Department. For tsunami evacuation planning specific to a waterfront property, consult the City of Long Beach's and Los Angeles County's current emergency management materials.