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Cambridge, MA Environmental Rules: Flood Zones (2026)

Heavy Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified April 2026

FEMA flood zone rules in Cambridge, MA, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.

Key Facts

Program: NFIP participant
Main flood areas: Charles, Alewife
Elevation: Above BFE plus freeboard
Insurance: Required for SFHA mortgages
Future risk: Climate Vuln Assessment

FEMA Flood Zone Lookup

FEMA assigns every parcel in the U.S. a flood-hazard designation on its Flood Insurance Rate Maps (FIRMs). Zones starting with A or V are high-risk Special Flood Hazard Areas where federally backed mortgages require NFIP flood insurance. Zone X indicates moderate-to-minimal risk, where insurance is optional but often recommended. Your specific zone determines insurance cost, build elevation, and permit requirements in Cambridge, MA.

Zone	What it means	NFIP required?
A	High-risk flood area; 1% annual chance flood, no detailed analysis.	Yes
AE	High-risk; same as A but with established Base Flood Elevations.	Yes
AH	High-risk shallow flooding (1-3 ft), usually ponding.	Yes
AO	High-risk shallow flooding (1-3 ft) with sheet flow on sloping terrain.	Yes
V	High-risk coastal zone subject to wave action (no BFE).	Yes
VE	High-risk coastal zone with wave action and established BFEs.	Yes
X (shaded)	Moderate risk; between the 1% and 0.2% annual chance flood.	Recommended
X	Minimal risk; outside the 0.2% annual chance floodplain.	No

Look up Cambridge, MA on the FEMA flood map

FEMA maps update periodically; verify zone before buying flood insurance or building.

Summary

Cambridge participates in the National Flood Insurance Program and enforces a Flood Plain Overlay District covering FEMA Special Flood Hazard Areas along the Charles River and Alewife Brook.

Section 40. No person shall remove, fill, dredge or alter any bank, riverfront area, fresh water wetland, coastal wetland, beach, dune, flat, marsh, meadow or swamp bordering on the ocean or on any estuary, creek, river, stream, pond, or lake, or any land under said waters or any land subject to tidal action, coastal storm flowage, or flooding, other than in the course of maintaining, repairing or replacing, but not substantially changing or enlarging, an existing and lawfully located structure or facility used in the service of the public and used to provide electric, gas, sewer, water, telephone, telegraph and other telecommunication services, without filing written notice of his intention to so remove, fill, dredge or alter, including such plans as may be necessary to describe such prop

Source: FEMA Map Service CenterView official code

Full Breakdown

FEMA Flood Insurance Rate Maps (FIRMs) delineate Special Flood Hazard Areas (Zones AE, A, and others) in Cambridge, primarily along the Charles River and the Alewife Brook watershed. The city's Flood Plain Overlay District in the Zoning Ordinance requires that new construction and substantial improvements in these areas elevate the lowest floor above Base Flood Elevation (BFE), typically with freeboard of 1 to 2 feet. Building permits require flood elevation certificates. Federally-backed mortgages in SFHAs mandate flood insurance. Cambridge also publishes its own Climate Change Vulnerability Assessment showing expanded future flood risk areas beyond current FEMA maps. Check FEMA Map Service Center and the city's climate resilience portal for your parcel.

Frequently Asked Questions

Is my Cambridge property in a flood zone?

Check the FEMA Map Service Center and the Cambridge GIS portal using your address to see FEMA zone designation.

Do I need flood insurance?

Federally-backed mortgages in SFHAs require flood insurance; it is recommended even in moderate-risk areas.

Sources & Official References

Other rules in Cambridge

Fence Regulations: Height LimitsSome Restrictions Boat Dock PermitsSignificant Restrictions Vehicle Idling RestrictionsLight Restrictions Stormwater ManagementSignificant Restrictions Flood Elevation RequirementsSome Restrictions Parking Rules: Loading ZonesSome Restrictions Parking Rules: Driveway RulesSome Restrictions Animal Ordinances: BeekeepingSome Restrictions Animal Ordinances: Veterinary Clinic ZoningSignificant Restrictions Animal Ordinances: Pet Store RulesHeavy Restrictions

All Cambridge rules

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