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Nashville, TN Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

New floodway structures: Prohibited outright
Min. floor elevation (occupied): 4 ft above base flood elevation
Approving agency: Metro Water & Sewerage Services
Cumberland River floodway buffer: Additional 50-ft no-build buffer
Applies to: Metro GSD, not 6 satellite cities

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 Nashville, TN.

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 Nashville, TN on the FEMA flood map

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

Summary

Metro Nashville bans new structures in the floodway under Metropolitan Code § 15.64.170, and requires floodplain construction to sit at least four feet above the base flood elevation.

No new structure shall be constructed within the floodway. Notwithstanding the foregoing, a structure located in the floodway as of the effective date of this ordinance may be maintained and may be repaired in the event of a casualty loss not exceeding fifty percent of appraised value of improvements on the property, provided that no such existing structure located in the floodway shall be enlarged or expanded beyond its existing height or building footprint.

Source: Metro Code Ch. 17.28 — Floodplain RegulationsView official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 53 | Charter: Republication 9).

Full Breakdown

Metropolitan Code of Laws § 15.64.170 bars new structures within the floodway anywhere in Metro Nashville's jurisdiction (this doesn't reach the six satellite cities, which keep separate codes). An existing floodway structure can only be repaired after a casualty loss under 50% of appraised value, and can't be enlarged beyond its existing footprint or height. Narrow exceptions allow grade-level parking, small temporary structures, water features, and public infrastructure engineered for no adverse impact. Outside the floodway but within the mapped floodplain, § 15.64.180 requires Metro Water Services approval for any alteration, and sets minimum floor elevation for occupied space at 4 feet above the base flood elevation.

Violations & Fines

Building within the floodway without a stormwater management commission exception, or below the required flood protection elevation, is a code violation; each day counts as a separate offense under § 15.64.220, drawing administrative penalties under T.C.A. § 68-221-1106.

Frequently Asked Questions

Can I build a new home in Nashville's floodway?

No. Metro Code § 15.64.170 bars new structures in the floodway, with narrow exceptions for parking, small temporary structures, water-related features, and public infrastructure engineered to cause no adverse impact.

How high must a floodplain home be built in Nashville?

Metro Code § 15.64.180 requires the minimum floor elevation for occupied space to be at least 4 feet above the base flood elevation, certified by a licensed engineer.

Who approves floodplain construction plans in Nashville?

The Metro Department of Water and Sewerage Services must approve any alteration of floodplain land or drainage channels before construction, per § 15.64.180.

Sources & Official References

[1]Metropolitan Code of Laws § 15.64.170, Development within floodways—Restrictions (Municode)

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