Brazoria County, TX Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in Brazoria County, TX, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Governing document
- Development Regulations for Floodplain Management (FEMA-required)
- Adopting section
- Subdivision Regulations § 5.01.A
- Preliminary plat requirement
- 100-year floodplain map, § 3.03.B.10
- Enforcing official
- Brazoria County Floodplain Administrator
- Legal basis
- FEMA regulations and Texas Water Code
- Effective date
- August 28, 2023 (Subdivision Regulations)
Summary
Brazoria County has no zoning power, but Section 5.01.A of its Subdivision Regulations requires every development in the unincorporated county to comply with the county's FEMA-required floodplain development regulations. The Floodplain Administrator enforces those rules, and every Preliminary Plat must include a 100-year floodplain map under Section 3.03.B.10 before the Engineering Department will move it toward a Final Plat.
A. Development Regulations for Floodplain Management Brazoria County has adopted Development Regulations as required by FEMA which must be complied with in the development of Tracts of land or Building of any structure. Copies of these regulations may be obtained from the Floodplain Administrator or www.brazoriacountytx.gov/departments/floodplain. 10. ... 100-year floodplain map showing proposed Plat boundary; 27. ... Floodplain Administrator: ... Enforces the development regulations established pursuant to the FEMA regulations and the Texas Water Code for the benefit of Brazoria County.
Full Breakdown
A of the county's Subdivision Regulations, effective August 28, 2023. The Flood Damage Prevention Order itself is a separate instrument obtainable from the Floodplain Administrator or the county's floodplain department webpage; the Subdivision Regulations point to it rather than restate it, and floodplain building permits are issued through that same office. 10 requires every Preliminary Plat to include a 100-year floodplain map showing the proposed plat's boundary, so flood exposure is identified before a subdivision moves to construction plans. The Subdivision Regulations' definitions section, item 27, names the Floodplain Administrator as the official who enforces the development regulations established pursuant to the FEMA regulations and the Texas Water Code for the benefit of Brazoria County, making that office, not the County Engineer alone, the enforcement point for flood-zone development standards countywide. 01's general ETJ clause, on top of the county's own requirements.
Violations & Fines
The Subdivision Regulations don't set their own dollar penalty for floodplain violations; enforcement runs through the Floodplain Administrator's permitting authority under the county's separate Flood Damage Prevention Order. A Preliminary Plat missing the required 100-year floodplain map under Section 3.03.B.10 is incomplete and won't advance to Final Plat or Commissioners Court approval until the map is supplied.
Frequently Asked Questions
Does unincorporated Brazoria County regulate floodplain development?
Who enforces floodplain rules in Brazoria County?
Does a subdivision plat have to show the floodplain?
Sources & Official References
Other rules in Brazoria County
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