Fire pit rules in St. Louis County, MO — also called outdoor burning, recreational fire, or open flame ordinances — cover fuel types, clearances, and when burning is allowed.
Recreational bonfires are exempt from St. Louis County's open-burning ban only when limited to 16 square feet, fueled with clean untreated wood, monitored at all times, and equipped with an extinguishing means. Local fire-district notification is required.
Under SLCRO §612.340 (Air Pollution Nuisance Prohibited) and Missouri 10 CSR 10-6.045, smoke or odor that crosses property lines is itself a nuisance. The recreational-burning exemption requires: ≤16 sq ft burn area, only clean untreated wood, continuous monitoring, immediate extinguishment available (hose or extinguisher), and prior contact with the local fire protection district. Trash, leaves outside September 16–April 14 window in unincorporated areas, and treated/painted wood are all prohibited.
SLCRO §612.340 violation; up to $1,000 fine and abatement order. Missouri DNR can layer civil penalties for air-quality violations.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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