Droppings and Urine: Rodent droppings are often the first and most obvious sign of activity. Small, dark pellets can be found along baseboards, in cabinets, or near food storage areas. In larger infestations, urine stains and a strong ammonia-like odor become noticeable, signaling active and ongoing presence. These contaminants not only create sanitation issues but also indicate areas of high rodent traffic.

Gnaw Marks and Property Damage: Rats and mice constantly chew to keep their teeth from overgrowing. They leave behind gnaw marks on electrical wiring, cardboard packaging, pallets, and even structural wood. Over time, this behavior can cause costly repairs, fire hazards from exposed wires, and loss of stored goods. Fresh bite marks are a clear sign that rodents are still active.

Noises and Movement: Employees may hear scratching, squeaking, or scurrying noises inside walls, ceilings, or utility areas—especially at night when rodents are most active. These sounds often indicate hidden nests or travel routes. In severe infestations, movement may even be visible across rafters, pipes, or along floor edges.

Nests and Burrows: Rodents build nests from shredded paper, insulation, fabric, or other soft materials. Indoors, these are often tucked away in dark corners, storage rooms, or behind equipment. Outdoors, burrows around foundations, dumpsters, or landscaping show where rodents are entering and exiting the property. Each nest signals an established infestation with breeding potential.

Grease Marks and Tracks: Rodents leave behind dark, greasy smears on walls, pipes, and baseboards as they follow the same travel routes repeatedly. In dusty areas, footprints and tail marks may also be visible. These trails highlight the exact pathways rodents are using, making them important clues during inspections.

Employee or Customer Sightings: Direct sightings of rats or mice, especially during daylight hours, often mean infestations are large enough to push rodents out of hiding. Reports from staff or customers not only confirm activity but also highlight the reputational risk that comes with visible rodents in a commercial setting.