Cambridge staff outline plan to update floodplain zoning, adopt new FEMA maps

The Health and Environment Committee of the City of Cambridge received a staff briefing on proposed amendments to the city—s floodplain zoning intended to adopt updated Federal Emergency Management Agency (FEMA) maps and align local ordinance language with the Massachusetts model bylaw.

The changes, presented by Jeff Roberts, director of zoning and development in the Community Development Department, and Teal Dallas of the zoning team, aim to replace Section 20.7 of the city—s zoning ordinance with model bylaw-derived text, reference six updated FEMA map panels that cover Cambridge, and streamline the local approval process for development in the mapped special flood hazard area.

Why it matters: Updating the ordinance will keep Cambridge eligible for the federal insurance program that depends on FEMA map references, preserve residents— access to flood insurance, and change permitting steps for projects in the floodplain. Staff said the city must complete the zoning amendment process in time to meet a July 8, 2025 deadline stated in the briefing.

City staff explained the technical and legal framework. Teal Dallas told the committee FEMA publishes county-level flood maps that must be referenced in local ordinance language to maintain compliance with the federal insurance program. The recent Middlesex County map updates require the city to update its zoning text because the ordinance currently references older FEMA panels.

Under the current ordinance (Section 20.7, adopted in 1982), development in FEMA-designated zones A and AE must obtain a Planning Board special permit in most cases and is reviewed by the city engineer and the Conservation Commission. A separate 2023 zoning section (Section 22.8) contains Cambridge—s flood-resilience standards, which are based on the city—s long-term flood elevations (not FEMA panels) and apply more broadly across the city; staff said those resilience standards remain in effect and continue to be enforced.

The proposed text amendment would replace the existing special-permit requirement tied to Section 20.7 with an administrative approval process that includes the same criteria and still requires a Conservation Commission public hearing and approval under the Wetlands Protection Act. Staff emphasized that a Planning Board special permit could still be required when triggered by other aspects of a project (for example, a project review special permit, a planned unit development, or the LW overlay district), but not solely because of the floodplain zoning change.

Staff also explained mapping details. Teal Dallas said the updated FEMA maps are issued as six panels that together cover the entire city; only the Alewife area currently contains the special flood hazard area (the 1% annual-chance, or "100-year," floodplain). Other mapped panels show areas with no designated special flood hazard. Staff noted FEMA uses the base flood (1% annual chance) and the moderate flood hazard (0.2% annual chance, or 500-year) classifications; the latter appears on maps as zone B or shaded X.

City staff described related state and federal processes. The Massachusetts model bylaw provides standardized language that the Department of Environmental Protection expects municipalities to adopt or adapt; the city—s proposed text would track that language while tailoring provisions to Cambridge. Staff also referenced the Wetlands Protection Act (1972), which authorizes the Conservation Commission to review and issue orders of conditions for projects affecting wetland resource areas. A city representative noted Cambridge participates in FEMA—s Community Rating System, which staff said helps produce public information and reduced flood-insurance rates for city residents.

On the question of public outreach and timing, staff said they will draft and send a memo to the City Council containing suggested petition text for a zoning amendment; that memo will be the vehicle to refer the petition to the Planning Board and the Ordinance Committee for hearings. Jeff Roberts said staff expect to have the petition language available in late March or early April so the council can complete the referral and the ordinance-review steps before the July 8, 2025 deadline. A city staff member identified as "Tim" said FEMA is required to hold its own community meetings related to new maps; those dates had not yet been scheduled at the time of the briefing.

No substantive public comment was recorded on the item during the meeting. Committee members asked staff how affected property owners would be notified; staff pointed to the city—s Community Rating System participation and the city website, where the new panels and a map viewer will be made available.

Formal action on the zoning change was not taken at the committee meeting; staff said no vote was required by the committee at this preview stage. The meeting concluded with a procedural motion to adjourn that passed by roll call.

Next steps: staff will circulate the suggested petition text to the City Council for referral to the Planning Board and the Ordinance Committee; pending hearings and any amendments, the City Council would next consider final adoption before the stated federal compliance deadline.