Environmental Rules in Ascension Parish, LA (2026)
4 rules for unincorporated Ascension Parish, Louisiana.
Verified from official government sources
Stormwater Management
Ascension Parish's stormwater management ordinance bans illegal discharges into the MS4 and requires construction sites disturbing an acre or more to follow an approved stormwater pollution prevention plan. Violations carry fines up to $500.00 per day plus possible jail time under the parish's MS4 permit program.
Ascension Parish Regulates Stormwater Discharge Parish-Wide
Significant RestrictionsAscension Parish Code § 18-116.11
(a)Purpose/intent. The purposes and objectives of this section are to provide for the health, safety and general welfare of the citizens of Ascension Parish by establishing policies and procedures for the permitting, monitoring, and/or enforcement regarding illicit discharge detection and elimination, construction site runoff control, and post-construction runoff control. ... (s)Criminal prosec...
Erosion Control
In unincorporated Ascension Parish, any development must have an erosion/sedimentation control (ESC) plan prepared by the project Engineer and approved by the Office of Planning and Development before work begins, under UDC Section 17-509. Sites disturbing more than one acre must also file a state storm water pollution prevention plan (SWPPP) with the parish Engineering Department under Louisiana's LPDES permit program.
Ascension Parish Erosion and Sediment Control
Some RestrictionsAscension Parish UDC § 17-509
A.An erosion/sedimentation control (ESC) plan shall be developed by the Engineer and submitted for approval to address potential sediment migration from the project site during construction activities. It will be the responsibility of the Contractor to maintain drainage ditches and detention ponds and to provide adequate bank stability and erosion protection until the site is fully stabilized. ...
Flood Zones
Any development in a special flood hazard area of unincorporated Ascension Parish needs a development permit under Chapter 9.5 of the parish code. Ascension Parish Code § 9.5-8 requires the permit, § 9.5-6 applies the chapter to every mapped special flood hazard area, and § 9.5-9 bars locating, altering or changing the use of any structure or land there without full compliance.
Ascension Parish Floodplain Development Permits
Some RestrictionsAscension Parish Code §§ 9.5-6, 9.5-8, 9.5-9
This chapter shall apply to all areas of special flood hazard with the jurisdiction of Ascension Parish Council. ... A development permit shall be required to ensure conformance with the provisions of this chapter. ... No structure or land shall hereafter be located, altered, or have its use changed without full compliance with the terms of this chapter and other applicable regulations.
Flood Elevation Requirements
Ascension Parish requires new buildings in the highest-risk flood zones to sit a full foot above the base flood elevation, not just even with it. Ascension Parish Code § 9.5-33(f) sets that one-foot freeboard for every primary building in FEMA Flood Zone A and Zones A1 through A99 in unincorporated Ascension Parish, on top of the parish's general elevation and floodproofing standards.
Ascension Parish Flood Elevation Freeboard Rule
Some RestrictionsAscension Parish Code § 9.5-33(f)
Minimum elevation for development. All primary buildings located on land which is designated as FEMA Flood Zone A, A1-A99 shall be constructed with a minimum elevation of one (1) foot above the base flood elevation.
All Ascension Parish ordinances
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