Virginia is home to rats year-round, with the Norway rat being the most common species across the state. These rodents thrive wherever people live, from Northern Virginia suburbs to downtown Richmond, and they become especially visible in fall and winter when they push indoors seeking warmth and food. Whether you’ve spotted signs of activity on your property or you’re trying to prevent an infestation, here’s what you need to know about rats in Virginia.
The Norway Rat Dominates Virginia
The Norway rat is the primary rat species you’ll encounter in Virginia. It’s not native to the state (or the continent), but it has established itself so thoroughly that it has displaced the black rat in most areas through sheer aggression and adaptability. Adults range from about 12 to 18 inches in total length, including the tail, and weigh roughly half a pound to just over a pound. Their fur is reddish-brown to black on the back with a pale or white belly, and the tail is scaly and two-toned.
Norway rats are burrowers. They dig underground tunnel systems with multiple exits, and as many as a dozen rats may share a single burrow network. You’ll find these burrows along foundations, under debris piles, near streambanks, and around garbage areas. They’re nocturnal and colonial, meaning where there’s one, there are almost certainly more. In Fairfax County, wildlife officials note that Norway rats will nest underground up to 150 feet from their food supply, so the burrow entrance and the food source drawing them in may not be in the same spot.
While roof rats (black rats) do exist in parts of the southeastern United States, Norway rats have largely pushed them out of Virginia. The Norway rat’s willingness to live almost anywhere, from sewers and fields to walls and crawl spaces, gives it a significant competitive advantage. If you’re dealing with a rat problem in Virginia, you’re almost certainly dealing with this species.
When Rats Are Most Active
A common misconception is that rats are only a winter problem. In Virginia, they stay active all twelve months. That said, their behavior shifts with the seasons in ways that directly affect homeowners.
Fall is the critical window. As nighttime temperatures drop, rats begin moving indoors looking for warmth, reliable food, and safe places to breed. If they find entry points in September or October, they’ll settle in and establish nests that persist through winter. By the time you notice signs of activity in December or January, the infestation may already be well established. Winter drives them deeper into homes: attics, wall voids, basements, garages, and crawl spaces all become nesting sites. They’ll target pantries, pet food bowls, and garbage for sustenance.
Spring and summer don’t bring relief. Rats remain active outdoors, burrowing in yards and around foundations, breeding in warm weather, and taking advantage of gardens, compost bins, and outdoor pet food. The population you see indoors in winter often reflects the population that’s been thriving outdoors all summer.
Where Infestations Are Most Common
Rats follow people, so Virginia’s most densely populated areas see the most rat activity. Northern Virginia’s urban and suburban communities, including Fairfax County, report consistent Norway rat and house mouse problems. Richmond has enough rodent activity that its city health department actively investigates pest infestation complaints and maintains a dedicated environmental health division for these issues.
But rat problems aren’t limited to cities. Any Virginia property that provides food, water, and shelter can attract them. Suburban homes with bird feeders, accessible garbage cans, pet food left outdoors, or overgrown landscaping near the foundation are all at risk. Rural properties with livestock feed, barns, or compost piles face similar challenges. Norway rats will even establish feral populations away from human habitation when conditions allow, though they strongly prefer living near people.
Signs of Rats on Your Property
The Richmond City Health Department identifies four key indicators: droppings, runways, burrows, and sightings of live or dead rats. Norway rat droppings are dark, capsule-shaped, and about three-quarters of an inch long. Fresh droppings are moist and dark; older ones turn gray and crumbly.
Runways are the paths rats travel repeatedly between their nest and food source. Along walls, fences, and foundations, you may notice grease marks (dark smudges from their oily fur), worn trails in grass or dirt, or gnaw marks on wood and plastic. Burrows appear as holes roughly two to three inches in diameter, often near foundations, under concrete slabs, or along garden borders. If you see a burrow with fresh dirt pushed out around the entrance, it’s actively in use.
Because Norway rats are nocturnal, seeing one during daylight often signals a large population. When numbers are high, competition for food forces some rats out during the day.
Health Risks From Virginia Rats
Rats carry diseases that can spread to humans through droppings, urine, saliva, and contaminated surfaces. One concern is hantavirus pulmonary syndrome, a rare but serious lung illness. The virus spreads primarily when people breathe in air contaminated with rodent urine, droppings, or saliva, or when they touch contaminated materials and then touch their nose or mouth. Symptoms start one to eight weeks after exposure, beginning with fever, fatigue, and muscle aches before progressing to coughing and shortness of breath as fluid builds in the lungs. The breathing problems appear 4 to 10 days after the initial flu-like symptoms and can become life-threatening.
That said, hantavirus is rarely reported in Virginia. About 94% of hantavirus infections in the U.S. occur west of the Mississippi River, and the primary carriers are deer mice, cotton rats, and white-footed mice rather than Norway rats. The more practical health concerns from Norway rats in Virginia include leptospirosis (spread through rat urine in water), salmonella contamination of food and surfaces, and rat-bite fever. Rats also carry fleas and ticks that bring their own disease risks.
If you’re cleaning up an area with rat droppings, the Virginia Department of Health recommends spraying the droppings with a bleach and water solution before disturbing them. Always wear gloves when handling contaminated materials or dead rodents. Never sweep or vacuum droppings dry, as this can launch particles into the air.
Controlling and Preventing Rats
Effective rat control combines three strategies: eliminating the food source, sealing entry points, and reducing the existing population. Sanitation comes first. Rats need only a few ounces of food per day, so even small attractants matter. Store garbage in tight-lidded containers, bring pet food inside at night, clean up fallen fruit from trees, and keep compost bins secured. Removing the food source makes baiting and trapping far more effective because rats have fewer alternatives.
Rat-proofing your home means sealing gaps larger than half an inch. Focus on where utility pipes enter the house, gaps under doors, foundation cracks, and openings around vents. Steel wool, metal flashing, and hardware cloth resist gnawing better than foam or caulk alone.
For active infestations, the Richmond City Health Department recommends contacting a licensed pest control company for private property. Virginia regulates pesticide use through the Virginia Pesticide Control Act, and commercial rodenticide application requires proper licensing. If you live in a multi-unit dwelling such as a condo, apartment, or community governed by a homeowners’ association, Virginia law requires landlords and property managers to notify residents about pesticide applications before they happen.
Reporting Rat Problems
If you’re dealing with rats on your own property, the responsibility falls on you or your landlord to hire a licensed pest control operator. But if you’re seeing rat activity that suggests a broader public health issue, such as infestations around restaurants, in public spaces, or in rental properties where a landlord isn’t responding, you can file a complaint with your local health department’s environmental health division. In Richmond, that division handles rodent and pest infestation investigations directly and can be reached at 804-205-3912. Other Virginia localities have similar environmental health offices that accept rodent complaints, and your local health district’s website will have the relevant contact information.