Are you concerned you may have a rodent infestation? Don’t panic. 

If you’re wondering, “What is a sign of a rodent infestation,” rest assured there are several ways to help you detect unwanted rodents in your home and office, including droppings, gnaw marks, unusual noises, nests, or foul odors. 

If you have any of these signs, it’s important to take action to appropriately eliminate them before the rodents cause significant damage to property or cause health risks. 

Five Signs You Have a Rodent Infestation

A rodent infestation means a large number of rodents living close to humans, and their presence can lead to various health issues, including allergies, asthma, Hantavirus Pulmonary Syndrome (HPS), or Salmonellosis. 

It’s important to look for early signs before the rodent infestation becomes severe, but what is a sign of a rodent infestation? Let’s take a look. 


Rodent droppings are among the most common signs of a rodent infestation in a home. These small, dark pellets can be found where rodents nest and forage for food. 

Droppings may differ in shape and size depending on the rodent species that has invaded your home. For example, mouse droppings are typically smaller and more pointed at the ends, while rat droppings tend to be larger with rounded ends.

Common places to find rodent droppings include cupboards, drawers, pantries, under sinks, behind appliances like refrigerators or ovens, and near any potential food sources such as pet food dishes or garbage cans.

It’s essential to clean up any discovered droppings promptly using gloves and disinfectant spray before vacuuming or sweeping the area thoroughly, as this helps prevent exposure to harmful bacteria that could cause illness.

You should regularly inspect these areas for new signs of activity even after an initial cleanup. 

Gnaw Marks

Rodents, such as mice and rats, have strong teeth that continuously grow. They constantly gnaw on different materials like wood, plastic, or even electrical wires to keep their teeth from becoming too long.

You might find gnaw marks in areas of your home including: 

  • Furniture: Check for small bite marks or scratches on wooden furniture legs or edges.
  • Walls: Look for holes chewed through drywall near baseboards or corners where rodents may try to create entry points into other rooms.
  • Kitchen cabinets and pantries: Inspect shelves and food packaging for any signs of damage caused by rodent chewing.
  • Pipes and wiring: Examine exposed pipes under sinks or in basements for evidence of rodent activity; also, check electrical wiring throughout the house since damaged wires can pose a fire hazard.

Unusual Noises

If you hear peculiar noises from your walls or ceilings, particularly in the evening, it could indicate a rodent infestation in your home. At night, rodents become more active and can be heard scurrying around in the walls or ceilings. As they move around inside walls or ceilings, their scratching and scurrying can create unsettling sounds that may keep you up at night.

Here are some common types of noises associated with rodents:

  • Scratching: This is usually caused by rodents’ claws as they climb or navigate through tight spaces within your home’s structure.
  • Gnawing: If you hear persistent gnawing sounds, it might indicate that rodents are chewing on woodwork, wires, or other materials to create nesting sites or access points for food sources.
  • Squeaking: Rodents communicate with each other using high-pitched squeaks, which can sometimes be audible to humans.


Mouse or rodent nests look like a messy pile of garbage, including paper shreds and sometimes insulation. These nests are typically small, around 6” in diameter, but if you find one (or several), it means rodents have taken up residence in your home. 

Foul Odors

Unwanted rodents will leave behind a strong odor from the accumulated urine and feces. Urine smells like ammonia, and the odor will stand out if left uncleaned and untreated, especially if there is an infestation. 

Call a quality rodent control expert if there is a musky smell in your home or office combined with any of the other warning signs on this left. 


Don’t let a rodent infestation go unnoticed; if you see any of these signs of an infestation in your home or workplace, it’s important to act quickly. 

If you’re wondering, “What is a sign of a rodent infestation,” fear not. If you find droppings, gnaw marks, signs of a nest, smell a foul, musky odor, or hear sounds like scurrying, clawing, or chewing, there’s a good chance unwanted pests have moved in. 

The experienced pest control professionals at Bay Area Rodent Solutions have over 12 years of experience and will use their expertise to identify the extent of the infestation, provide effective treatment options, and offer guidance to prevent future issues. 

Contact us today.