Photo: Rodent entering a structural flaw caught on surveillance cameras deployed at a facility having captures.
By: Jeff Waggoner, ACE
Facilities that handle food, pharmaceuticals, or other vulnerable commodities must keep rodents out. Even one mouse or rat can contaminate product through droppings, urine, and hair, creating adulteration risks and regulatory problems. The trail-camera image above shows a rodent using a narrow structural gap in an industrial setting at night—exactly the kind of vulnerability exclusion is meant to eliminate.
For teams new to pest management, the guiding principle is prevention. Integrated Pest Management (IPM) starts by physically keeping pests out rather than relying mainly on traps after they enter.
What the Regulations Require…
FDA rules treat exclusion as a core expectation. Under 21 CFR 117.35(c) for human food plants, pests must not be allowed in any area of the plant. Effective measures must exclude them from manufacturing, processing, packing, and holding areas and protect food from contamination on the premises.
Pharmaceutical manufacturing follows a parallel standard in 21 CFR 211.56. Buildings used to manufacture, process, pack, or hold drug products must be free of infestation by rodents and other vermin. Written procedures must assign sanitation responsibilities and describe methods that prevent contamination of product, equipment, and packaging.
Distribution and commodity storage operations face comparable expectations from regulators, customers, and third-party auditors. The goal in every case is the same: stop entry before contamination can occur.
Why Exclusion Works…
House mice can squeeze through openings about ¼ inch wide (roughly the diameter of a pencil). Rats need roughly ½ inch. Common entry points include gaps under doors, worn dock seals and levelers, utility penetrations for pipes and conduits, foundation cracks, and unscreened vents or roof openings.
Durable materials matter. Copper mesh packed into gaps and covered with sealant, metal flashing, hardware cloth, and specialized rodent-proof door sweeps resist gnawing far better than foam, rubber, or ordinary caulk alone. Sealing these points, then maintaining them, is the highest-return step in any program.
Practical First Steps…
- Inspect the exterior and interior for any gap ¼ inch or larger.
- Prioritize doors, loading docks, and service penetrations.
- Work with a reputable manufacturer of rodent-proof materials on selecting the right solution for each opportunity.
- Properly trained installers should be used who will routinely inspect, repair and warranty materials is important.
- Maintain a clear perimeter free of vegetation and debris that provides cover.
- Monitor with non-toxic baits and tools such as electronic sensors and trail cameras to verify that exclusion is holding and to detect activity early.
Enhance sanitation efforts as it reduces food and water sources and supports the program, but the newly installed physical barriers are the primary defense when an unwanted guest desires entry.
How DynamicIPM Fits In…
Proactive rodent exclusion is a core part of our DynamicIPM service offering. By combining thorough structural exclusion, targeted monitoring, and a focus on root-cause prevention, DynamicIPM helps facilities stay ahead of rodent pressure, support regulatory compliance, and protect product integrity with less reliance on purely reactive measures.
For facilities building or strengthening their pest program, a professional exclusion assessment is the most practical place to start. Connect with FSS to schedule one today. www.FSSZone.com