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Chattanooga, TN Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

Governing section: § 38-38, enacted by Ord. No. 14298 (Dec. 2, 2025)
Permit: Floodplain development permit from the Land Development Office Director
Residential floor: 2 feet above BFE (wood); 1 foot (concrete slab on grade)
Non-residential floor: 1 foot above BFE, or floodproofed with engineer certification
Floodway test: Stage increase of 0.00 feet; CLOMR first if BFE rises
Variances: City Council decides appeals within 14 days of hearing
Penalty: Article XVIII penalties; each day a separate offense

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 Chattanooga, 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 Chattanooga, TN on the FEMA flood map

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

Summary

Chattanooga regulates every parcel inside a FEMA Special Flood Hazard Area under City Code § 38-38, rewritten by Ord. No. 14298 on December 2, 2025. All construction and other development needs a floodplain development permit from the Land Development Office Director. A wood-frame home must sit two feet above Base Flood Elevation, and the floodway allows almost no structures.

Any lawful use permitted in the various zones is also permitted in the portions of such zones underlying the Special Flood Hazard Area subject to all applicable zone standards, off-street parking, and other regulations applicable in such zones. However, in the case of conflict, the provisions of this section for flood hazard reduction control. ... new construction and substantial improvement of any residential building (or manufactured home) shall have the lowest floor, including basement, elevated to no lower than two (2) feet above the Base Flood Elevation if constructed of wood or one (1) foot above base flood elevation if constructed or concrete (slab on grade type of construction). ... Development allowed in the floodway district is limited to that which has low flood damage potential and will not obstruct flood flows, increase velocities, or increase the water surface elevations of the one-percent annual chance flood. No structures are allowed in the Floodway District other than water control, public utility facilities, and water-oriented industries which are permitted in or adjacent to water courses for approved operation.

View 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 40 Update 1).

Full Breakdown

Ord. No. 14298 repealed the old floodway rule and the old F/H flood hazard rule, which left § 38-39 Reserved, and replaced both with one § 38-38 covering the whole incorporated city. The regulatory maps are the FEMA Flood Insurance Rate Map panels dated November 28, 2025, 62 numbered panels plus the index. Each mapped parcel sits in one of three districts: Floodway, Flood Fringe, or General Floodplain. Uses allowed by the underlying zone carry over, but this section controls in a conflict.

Each structure needs its own floodplain development permit, and the requirement reaches fences, pools, decks, fill, utilities and flood repairs. A residential lowest floor, including the basement, goes two feet above Base Flood Elevation for wood construction and one foot for concrete slab on grade. Non-residential buildings go one foot above that level or are floodproofed with certification from a Tennessee engineer or architect. In approximate A Zones with no elevation data, the floor sits three feet above the highest adjacent grade. Enclosures below the lowest floor need two openings totaling at least one square inch per square foot of enclosed area, each starting no higher than one foot above grade. On-site waste disposal systems are not allowed, and buoyant, flammable or explosive materials cannot be stored in the area. Wet floodproofed accessory structures are capped at 400 square feet and need a variance.

In the Floodway, an applicant must show a stage increase of 0.00 feet, documented through a no-rise certification. A project that raises base flood elevations needs a FEMA Conditional Letter of Map Revision before construction and a Letter of Map Revision afterward. In the Flood Fringe, cumulative development cannot raise the base flood more than one foot. Along A Zone streams without data, nothing is built within the stream width or twenty feet of the top of bank, whichever is greater, absent an engineer's certification. Recreational vehicles stay fewer than 180 consecutive days or remain highway ready.

Violations & Fines

A violation is punished on conviction as provided in Article XVIII, plus all costs and expenses of the case, and each day it continues is a separate offense. The City can also take any other lawful action to prevent or remedy the violation. A missing or deficient as-built elevation certification is cause for a stop-work order, and the Director can withhold the Certificate of Compliance or Occupancy until the permit holder corrects the deficiency.

Frequently Asked Questions

Do I need a permit to build a fence, pool or deck in a Chattanooga flood zone?

Yes. Section 38-38 requires a floodplain development permit from the Director of the Land Development Office for the construction of a fence, pool, deck, or placement of anything that could obstruct flood flow. Each structure gets its own permit, and even normal maintenance requires a permit so the Director can test whether the work counts as a substantial improvement.

How high must a new house be elevated?

In AE Zones with a published Base Flood Elevation, the lowest floor, including the basement, must be at least two feet above it for wood construction or one foot above it for concrete slab on grade. In approximate A Zones without elevation data, the floor must be three feet above the highest adjacent grade. A Tennessee-registered surveyor certifies the lowest floor elevation.

Can I build a structure in the floodway?

Almost never. Chattanooga allows no structures in the Floodway District other than water control, public utility facilities, and water-oriented industries that must sit in or beside a watercourse. Recreational uses, roads, trails, bridges, culverts and shoreline stabilization can go forward with a permit, but the applicant must prove a stage increase of 0.00 feet during the one-percent annual chance flood.

How does the City decide whether repairs are a substantial improvement?

Before issuing a permit, the Director estimates the structure's market value, which for repairs means value before the damage, and compares it to the full cost of materials and labor, including ordinary maintenance over the past year. Earlier additions since the community adopted floodplain standards count too. A nonconforming structure with a repetitive loss is treated as substantially damaged, and the Director sends the owner a determination letter.

Can I get a variance, and who decides?

The Chattanooga City Council hears variances and appeals, and decides an appeal within 14 days of the hearing. A variance needs good and sufficient cause, exceptional hardship, and the minimum relief necessary. None is issued in the Floodway if flood levels would rise. A granted variance comes with written notice that flood insurance costs will match the increased risk, and a court can review the Council's decision.

Sources & Official References

[1]Chattanooga City Code Chapter 38 - Zoning (Municode)

Other rules in Chattanooga

Noise Ordinances: Quiet HoursSome Restrictions Noise Ordinances: Construction HoursSome Restrictions Stormwater ManagementSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Noise Ordinances: Barking DogsSome Restrictions Parking Rules: Loading ZonesSome Restrictions Parking Rules: Towing & Impound RightsSignificant Restrictions Parking Rules: Preferential Parking DistrictsSome Restrictions

All Chattanooga rules

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