Key Facts Ordinance Text Full Breakdown Violations FAQ Sources More in Dayton

Dayton, OH Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

Permit required: Before any development in flood zone
Administrator: Chief Building Official
Review timeline: 30 days to approve/deny
Permit validity: Expires 180 days if unstarted
Map basis: FIRM effective Oct. 27, 2022

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 Dayton, OH.

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 Dayton, OH on the FEMA flood map

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

Summary

Any filling, grading, construction, or watercourse alteration within Dayton's mapped special flood hazard areas requires a floodplain development permit from the Floodplain Administrator before work begins.

It shall be unlawful for any person to begin construction or other development activity including but not limited to filling, grading, construction, alteration, remodeling, or expanding any structure; or alteration of any watercourse wholly within, partially within or in contact with any identified special flood hazard area, as established in Section 152.58, until a floodplain development permit is obtained from the Floodplain Administrator. Such floodplain development permit shall show that the proposed development activity is in conformity with the provisions of these regulations. No such permit shall be issued by the Floodplain Administrator until the requirements of these regulations have been met.
(Ord. 31991-22A, passed 9-21-22; Ord. 32116-24, passed 10-9-24)

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 35).

Full Breakdown

Dayton's general code, Ch. 152 Division 3 (Floodplain District Regulations), applies to all areas of special flood hazard within city limits as mapped on the Montgomery County Flood Insurance Rate Map (effective October 27, 2022), per §§ 152.55–152.58. Section 152.66 makes it unlawful to begin construction, filling, grading, remodeling, or watercourse alteration in a flood hazard area without a floodplain development permit from the Floodplain Administrator (the Chief Building Official, § 152.64). Applications go through a 30-day review under § 152.68, and a granted permit expires in 180 days if work hasn't substantially started. Routine maintenance and small nonstructural work under $2,500 are exempt under § 152.72.

Violations & Fines

Starting construction, filling, grading, or altering a watercourse in a special flood hazard area without a floodplain development permit violates § 152.66 and can bring a stop-work order or permit revocation with a right of appeal under § 152.86.

Frequently Asked Questions

Do I need a permit to build in a Dayton flood zone?

Yes. R.C.G.O. § 152.66 makes it unlawful to begin construction, filling, grading, or watercourse work in a mapped special flood hazard area without a floodplain development permit from the Floodplain Administrator.

Is minor work like painting exempt?

Yes, § 152.72 exempts routine maintenance such as roofing, painting, and basement sealing, plus small nonstructural work under $2,500, excluding filling and grading.

Sources & Official References

[1]Dayton, Ohio Code of Ordinances — Municode

Other rules in Dayton

Noise Ordinances: Quiet HoursSome Restrictions Fence Regulations: Height LimitsSome Restrictions Stormwater ManagementSignificant Restrictions Erosion ControlSignificant Restrictions Flood Elevation RequirementsSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Parking Rules: Towing & Impound RightsSome Restrictions Parking Rules: EV ChargingSome Restrictions Parking Rules: Driveway RulesSome Restrictions

All Dayton rules

Compare Dayton to another location·View the Ohio environmental rules overview

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.