FEMA flood zone rules in Waltham, MA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Waltham enforces FEMA floodplain regulations along the Charles River and its tributaries, requiring flood elevation certificates and floodproofing for development in A and AE zones.
Waltham participates in the National Flood Insurance Program (NFIP) and enforces floodplain development standards through its Floodplain District overlay under the Zoning Ordinance. The Charles River flows through south Waltham and creates significant Zone AE (100-year floodplain) along its banks, with base flood elevations set by FEMA Flood Insurance Rate Maps (FIRMs) updated 2021. Tributaries Beaver Brook, Chester Brook, and Hardy Pond also have mapped floodplains. New buildings in the Floodplain District must have lowest floors elevated at least 1 foot above base flood elevation, or be floodproofed (commercial only). Substantial improvement (over 50 percent of market value) triggers full compliance. Fill in the floodway is prohibited. Flood insurance is required for federally-backed mortgages in Zone AE.
Contact your local code enforcement office for specific penalty information.
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Waltham, MA
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Side-by-side rule comparisons with other cities in Middlesex County.
See how other cities in Middlesex County handle flood zones.
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