Flood Zones: Ayer vs Waltham
How do flood zones rules compare between Ayer, MA and Waltham, MA?
Ayer and Waltham have similar restriction levels.
Ayer, MA
Middlesex County
Ayer's Floodplain Overlay District in Article 8 of the Zoning Bylaw regulates all FEMA Zone A and AE special flood hazard areas shown on the Middlesex County FIRM panels dated June 4, 2010, with new construction and encroachments generally prohibited.
View full Ayer rules →Waltham, MA
Middlesex County
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.
View full Waltham rules →Key Facts Comparison
| Fact | Ayer | Waltham |
|---|---|---|
| Code Section | Zoning Bylaw Article 8 (FOD) | - |
| FEMA Zones | A and AE | - |
| FIRM Effective Date | June 4, 2010 | - |
| FIRM Panels | 25017C0203E-0217E (8 panels) | - |
| Standard | 780 CMR flood-resistant | - |
| Main Floodplain | - | Charles River Zone AE |
| Freeboard | - | 1 foot above BFE |
| Substantial Improvement | - | 50 percent market value |
| Floodway Fill | - | Prohibited |
| FIRM Update | - | 2021 effective maps |
Highlighted rows indicate differences between cities.
Ayer FAQ
Is my Ayer property in a flood zone?
Check FEMA's Map Service Center for Middlesex County FIRM panels effective June 4, 2010 to see if you are in Zone A or AE.
Can I build in Ayer's floodplain?
New construction in the Floodplain Overlay District is prohibited unless it meets 780 CMR flood-resistant standards and earns a special permit.
What FIRM panels cover Ayer?
Panels 25017C0203E, 0204E, 0208E, 0209E, 0211E, 0212E, 0216E, and 0217E, all dated June 4, 2010.
Waltham FAQ
How do I know if my Waltham property is in a flood zone?
Check the FEMA Flood Map Service Center online by address, or contact the Waltham Conservation Commission for assistance reading the FIRM.
Do I need flood insurance in Waltham?
Federal law requires it for mortgaged properties in Zone AE. Even outside mapped zones, flood insurance is recommended near the Charles River or its tributaries.
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