Environmental Rules in Jefferson County, MO (2026)
4 rules for unincorporated Jefferson County, Missouri.
Verified from official government sources
Stormwater Management
Unincorporated Jefferson County requires a land disturbance permit for any project disturbing 5,000 square feet or more, with structural stormwater Best Management Practices mandatory at one acre. The Department of Public Works administers permits under Chapter 505, with violations charged as misdemeanors carrying at least a $200.00 fine per day.
Jefferson County MO Stormwater Land Disturbance Permit
Some RestrictionsJefferson County Code of Ordinances § 505.190(A)
Permit Required. No person may engage in any land disturbance activity, including persons engaged in land disturbance activity related to utility installation or maintenance, without first obtaining a land disturbance permit from the County, except as provided in this Chapter. All new or redevelopment projects disturbing five thousand (5,000) square feet or greater are required to obtain a land...
Erosion Control
Jefferson County requires a land disturbance permit before any grading, clearing or construction activity that disturbs 5,000 square feet or more of unincorporated county land. Projects of one acre or larger must install stormwater best management practices, and permit fees scale with the acreage disturbed under Chapter 505 of the county code.
Jefferson County Land Disturbance Permit
Some RestrictionsJefferson County, MO Code of Ordinances § 505.190(A)
Permit Required. No person may engage in any land disturbance activity, including persons engaged in land disturbance activity related to utility installation or maintenance, without first obtaining a land disturbance permit from the County, except as provided in this Chapter. All new or redevelopment projects disturbing five thousand (5,000) square feet or greater are required to obtain a land...
Flood Zones
Jefferson County requires a floodplain development permit for any construction in mapped A, AE, AO or AH flood zones on its current FIRM panels, issued by the Director under Chapter 405, Section 405.040 of the county code, adopted December 4, 2025.
Jefferson County Floodplain Development Permit
Significant RestrictionsJefferson County, MO Code § 405.040(A)
Lands To Which Chapter Applies. This Chapter shall apply to all lands within the jurisdiction of Jefferson County, Missouri, identified as numbered and unnumbered A Zones, AE, AO, and AH Zones, on the Flood Insurance Rate Map (FIRM) panel numbers 29099CIND1C and 29099CIND2C dated October 2, 2025, as amended, and any future revisions thereto. In all areas covered by this Chapter, no development ...
Flood Elevation Requirements
Jefferson County requires new and substantially improved structures in mapped flood zones to elevate the lowest floor three feet above base flood elevation, or floodproof non-residential buildings to that height, under Section 405.060(B)(1) of the county's Flood Damage Prevention chapter.
Jefferson County 3-Foot Freeboard Requirement
Significant RestrictionsJefferson County, MO Code § 405.060(B)(1)(a)-(b)
Residential Construction. New construction or substantial improvement of any residential structures, including manufactured homes, shall have the lowest floor, including basement, elevated to three (3) feet above base flood elevation. The elevation of the lowest floor shall be certified by a Missouri licensed land surveyor, engineer, or architect. Non-Residential Construction. New construction ...
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