Environmental Rules in Cass County, MO (2026)
4 rules for unincorporated Cass County, Missouri.
Verified from official government sources
Stormwater Management
Unincorporated Cass County runs a storm water management program under the federal Clean Water Act's NPDES Phase II rules. The Big Creek, Mount Pleasant, and Raymore townships require a land disturbance permit and a Storm Water Pollution Prevention Plan before soil-disturbing work begins.
Cass County Stormwater Management Rules
Some RestrictionsCass County Code § 400.510
Under the Federal Clean Water Act of 1972 and additions, storm water management regulations must be implemented for Cass County, in particular to demonstrate compliance with the National Pollutant Discharge Elimination System (NPDES) Phase II section of that law. The County is required to implement a storm water management program for the management of the impact and potential for pollution of ...
Erosion Control
Zoning Order Section 400.520 requires erosion and sediment controls on any land-disturbing use in unincorporated Cass County: silt fences, straw bale barriers, check dams, and sediment traps to keep soil and pollutants from leaving the site during construction.
Erosion & Sediment Control in Cass County
Some RestrictionsCass County Code § 400.520(A)(2)
Section 400.520. Management Methods. ... Install erosion and sediment controls which, when implemented, prevent or minimize erosion of the surface soils and control the amount of sediment or pollutants leaving a site. Such controls may be accomplished by the following: ... Installing perimeter controls to intercept and detain small amounts of sediment, such as silt fences, straw bale barriers, ...
Flood Zones
The Cass County Floodplain Management Order, Zoning Order § 400.400, applies to every unincorporated parcel FEMA maps within the floodway (FW) or flood fringe (FF) district. Section 400.450(C) bars any construction, substantial improvement or surface disturbance in those districts without a county permit.
Floodplain Development Rules, Cass County
Significant RestrictionsCass County Code §§ 400.400, 400.450
The provisions of this Subsection shall apply to all unincorporated areas of Cass County identified on the Flood Insurance Rate Maps (FIRM) or Floodway Maps as promulgated by the Federal Emergency Management Agency (FEMA) and determined to be within the floodway (FW) and flood fringe (FF) districts as defined in this order. The County shall enforce these floodplain regulations to meet provision...
Flood Elevation Requirements
Cass County's Floodplain Management Order requires new or substantially improved residences in flood-hazard districts to have their lowest floor elevated at least two feet above the Base Flood Elevation, the county's freeboard standard defined at Zoning Order § 400.430 and applied at § 400.460(B).
Flood Elevation Freeboard Rule, Cass County
Some RestrictionsCass County Code §§ 400.430, 400.460(B)
FREEBOARD A factor of safety to limit damage above a Base Flood Elevation (BFE). ... Freeboard for this Order is two (2) feet above the Base Flood Elevation. ... All residences to be placed or substantially improved to more than fifty percent (50%) of the current market value within the FW, FF and the A Zone districts shall be elevated on a permanent foundation such that the lowest floor of the...
All Cass County ordinances
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