Animals in Your Chimney — A CO Risk You Can't Smell
Chimney animal entry is more common in St. Louis than most homeowners realize. Missouri's mix of mature trees, diverse wildlife, and pre-war homes with uncapped chimneys creates ideal conditions for animal entry. The problem compounds over time — a small gap in the cap becomes a squirrel highway, nesting material accumulates and restricts the flue, and by the time odors appear inside, the contamination is already significant.
Animals We Commonly Find in St. Louis Chimneys
Chimney Swifts (Protected Migratory Birds)
Chimney swifts are federally protected under the Migratory Bird Treaty Act — it is illegal to disturb an active swift nest. They typically occupy chimneys from May through October, then migrate south. Our approach: confirm the species, document the nest, and schedule cap installation after the birds have departed. We never disturb active swift nests.
Squirrels
The most common St. Louis chimney visitor. Squirrels enter through failed or missing caps and frequently become trapped in the firebox. Active nests require careful removal and sanitization — squirrel nesting material is highly combustible and must be completely cleared before the chimney can be safely used.
Raccoons
Raccoons typically don't fall into chimneys — they use them intentionally as nesting sites, particularly females with young in late spring. Raccoon removal requires care due to Missouri's rabies prevalence and the animals' protective instincts around young. We handle removal humanely and legally, and sanitize thoroughly afterward.
Bats
Bats found inside the living space (not just the chimney) require immediate professional response due to Missouri's bat rabies risk. We remove bats humanely, seal entry points, and sanitize affected areas. Our technicians are vaccinated for rabies as a precaution.
Our Animal Removal Process
- Species identification — determines legal removal method and timing
- Humane removal of animal and complete nest material extraction
- Flue sanitization — enzyme treatment to eliminate odors and pathogens
- CO safety check — calibrated equipment to confirm safe flue operation
- Stainless steel cap installation — prevents all future animal entry
- Level I inspection to confirm no structural damage from nesting