Grand Prairie, TX Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in Grand Prairie, TX, 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
- Floodplain Development Permit (FDP)
- Issuing department
- Stormwater Department
- Floodway rule
- No encroachment without engineer certification
- Small lots
- Under 1 acre: FDP folds into building permit
- Fences
- Allowed if lower portion passes stormwater
- Penalty
- Fine under Sec. 1-8, per-day violation
- Maps used
- FEMA FIS/FIRM for 4 counties
Summary
Grand Prairie requires a Floodplain Development Permit from the Stormwater Department before any structure, fill, or land-use change occurs inside a FEMA-mapped Special Flood Hazard Area. The city adopted the Tarrant, Dallas, Ellis and Johnson County Flood Insurance Studies and their Flood Insurance Rate Maps by reference, and Unified Development Code Article 15 sets the permit, floodway-encroachment and floodproofing standards enforced citywide and in the extraterritorial jurisdiction.
15.6.1 The SFHAs include: A. The areas of special flood hazard identified by FEMA in the current scientific and engineering report entitled, "The Flood Insurance Study (FIS) for Tarrant County, Texas and Incorporated Areas," dated March 21, 2019, with accompanying Flood Insurance Rate Maps (FIRM) dated March 21, 2019 and any revisions thereto are hereby adopted by reference and declared to be a part of this ordinance ... 15.15.1 A City of Grand Prairie Floodplain Development Permit (FDP) shall be required for all proposed development in a Special Flood Hazard Area or floodplain to assure conformance with the provisions of this Article. It shall be issued by the Stormwater Department.
Full Breakdown
Article 15 of the Unified Development Code, adopted under the National Flood Insurance Program, defines Special Flood Hazard Areas as those mapped in FEMA's Flood Insurance Studies for Tarrant County (March 21, 2019), Dallas County (March 21, 2019), Ellis County (October 19, 2023) and Johnson County (September 21, 2023), plus any area known to flood even if FEMA has not yet mapped it (Section 6). Inside the floodway, Section 7 prohibits fill, new construction and substantial improvements unless a registered professional engineer certifies to the Floodplain Administrator that the work will not raise the base flood elevation during a 100-year storm; the Stormwater Department can withhold subdivision plat approval until downstream drainage problems are addressed.
Section 8 makes compliance mandatory before any structure or lot in the floodplain is located, altered or has its use changed. To build, an owner files a Floodplain Development Permit application with the Floodplain Administrator showing lot elevations, lowest-floor elevation, and floodproofing certification for nonresidential structures (Section 15). Parcels under one acre inside the mapped floodplain can fold the FDP into the standard building permit. Fences are allowed within the floodplain, but the portion below the lowest floor elevation must let stormwater pass through, and a separate Building Inspections Department fence permit is still required.
Applicants pursuing a Letter of Map Change or a Trinity River Corridor Development Certificate pay FEMA and third-party review recovery fees set under Article 22's fee schedule.
Violations & Fines
Building or altering property in the floodplain without an FDP, or violating any Article 15 requirement, is punished under Code of Ordinances Section 1-8: each day the violation continues is a separate offense, and the violator pays a fine plus all city costs and expenses tied to the case. The Stormwater Department and Floodplain Administrator can also pursue any other lawful remedy, including withholding plat or building permit approval, to stop or correct the violation (Section 26).
Frequently Asked Questions
Do I need a permit to build in Grand Prairie's floodplain?
Can I add a fence on floodplain property?
Which FEMA flood maps does the city use?
What if I build in the floodway without engineering approval?
Sources & Official References
Other rules in Grand Prairie
Texas rules heatmap·Compare Grand Prairie to another location·View the Texas environmental rules overview
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Flood Zones in Nearby Cities
How other cities in Dallas County handle flood zones.