3 county-level rules, plus city-specific rules for 2 cities in St. Louis County, Missouri.
Verified from official government sources
SLCRO §1005.230 (Grading) and §1114.200 (Design Requirements) require grading permits or approved improvement plans before any grading. Erosion and siltation controls are mandatory. Grading that alters watersheds is prohibited.
St. Louis County Code §1005.230 / §1114.200
Sec. 1005.230. — Grading. Grading that creates a change in watersheds, as well as the grading of natural resources, is not permitted. A grading permit, or approved improvement plans, is required prior to any grading on the site. Erosion and siltation control devices are required by the Department of Highways & Traffic.
St. Louis County Chapter 1008 implements NFIP floodplain regulations. New and substantially improved structures in Special Flood Hazard Areas (SFHAs) along the Mississippi, Missouri, and Meramec Rivers must have their lowest floor (including basement) elevated to or above Base Flood Elevation (BFE), referenced to NAVD88.
St. Louis County Code Chapter 1008
Chapter 1008. — The special flood hazard areas of unincorporated St. Louis County, Missouri are subject to inundation which results in loss of life and property, health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base.
SLCRO §1115.105.2 exempts site/land-disturbance work of less than 30 cubic yards of soil moved AND less than 2,000 sq ft of disturbed area from the building-permit requirement. Larger projects require a grading permit and erosion controls.
St. Louis County Code §1115.105.2
Miscellaneous site/land disturbance work involving less than thirty (30) cubic yards of earth/soil moved and less than two thousand (2,000) square feet in area, resodding or seeding grass areas up to ten thousand (10,000) square feet, landscaping, gardens, shrubbery and planting boxes that does not create a change in the property elevation along property lines, block drainage or create erosion ...
2 cities in St. Louis County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
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