Environmental Rules in St. Tammany Parish, LA (2026)
5 rules for unincorporated St. Tammany Parish, Louisiana.
Verified from official government sources
Stormwater Management
St. Tammany Parish bans illicit discharges into its Municipal Separate Storm Sewer System (MS4) and drainage infrastructure under UDC Section 900-6.9. Construction sites of one acre or more need a stormwater pollution prevention plan, and sites of five acres or more also need an LDEQ notice of intent.
Stormwater Discharge Rules in St. Tammany Parish
Some RestrictionsSt. Tammany Parish Code of Ordinances § 900-6.9(C)
No person shall introduce or cause to be introduced into the MS4, drainage infrastructure, conveyances, or waterways of the parish any illicit discharge, including non-stormwater discharges that are not composed entirely of stormwater, except as expressly provided for in this section. No person shall introduce or cause to be introduced into the MS4, drainage infrastructure, conveyances, or wate...
Erosion Control
St. Tammany Parish requires every construction site in the unincorporated parish, from single-family lots to subdivisions, to install and maintain Best Management Practices controlling silt, sediment, mud and clay discharge under its MS4 stormwater ordinance. Projects need an approved Stormwater Agreement and Construction Stormwater Site Plan before a building, site work or subdivision permit issues, plus an LDEQ SWPPP for sites disturbing an acre or more.
St. Tammany Parish Construction Erosion Control Rule
Some RestrictionsSt. Tammany Parish Code of Ordinances § 900-6.9(F)
F.Stormwater Discharges from Construction Activities.1.No construction activity nor development shall degrade water quality in the receiving stream or adversely affect the MS4.2.All construction projects involving site work of any kind, including but not limited to subdivision development, minor subdivision development, residential construction, commercial construction, and roadway construction...
Flood Zones
St. Tammany Parish requires a Floodplain Development Permit for any construction, alteration or land-use change in a mapped special flood hazard area, and new or substantially improved residences must set their lowest floor at least 12 inches above the base flood elevation.
St. Tammany Parish Floodplain Development Permit
Significant RestrictionsSt. Tammany Parish Code of Ordinances § 900-6.7
Establishment of Development Permit. A Floodplain Development Permit shall be required to ensure conformance with the provisions of this ordinance... Residential Construction. new construction and substantial improvement of any residential structure shall have the lowest floor (including basement), at or above the base flood elevation plus 12 inches... Penalties for Non Compliance. Violation of...
Boat Dock Permits
Boat houses, piers and docks accessory to a home in unincorporated St. Tammany Parish answer to Sec. 600-6.2(1). A boat house cannot be lived in, tops out at 20 feet in height and 1,600 square feet (800 square feet on a state-designated scenic river), and together with other accessory buildings cannot cover more than half the required rear yard.
St. Tammany Parish boat house and dock rules
Some RestrictionsSt. Tammany Parish Code of Ordinances § 600-6.2(1)
1.Boat houses and boat slips located in residential districts. The following regulations shall apply to accessory boat houses and boat slips located in residential districts:a.A boat house shall not be used for habitation.b.The height of a boat house shall not exceed 20 feet as measured from the required lot elevation.c.No boat house shall exceed 1,600 square feet, except that any boat house co...
Flood Elevation Requirements
St. Tammany Parish requires new and substantially improved residential and nonresidential structures in special flood hazard areas to set the lowest floor, including any basement, at least 12 inches above the base flood elevation shown on the parish's 1999 FIRM. A Floodplain Development Permit and a licensed engineer's elevation certification are mandatory before construction begins in the unincorporated parish.
St. Tammany Parish Flood Elevation & Freeboard Rule
Some RestrictionsSt. Tammany Parish Code of Ordinances § 900-6.7(E)(2)(a)
a.Residential Construction. new construction and substantial improvement of any residential structure shall have the lowest floor (including basement), at or above the base flood elevation plus 12 inches. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection as proposed in section (D)—Adm...
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