Norway rats along creeks and foundations.
Norway rats are the larger, ground-dwelling rat most common around Fairfax. They burrow along foundations, under sheds and decks, and beside fence lines, and they follow water and food sources the way a trail leads to a destination. Accotink Creek and Daniels Run, along with the storm drainage that feeds them, give Norway rats a route through the city that connects yard to yard.
A burrow entrance looks like a smooth, worn hole about the size of a tennis ball, often with a shallow, packed-down path leading to it. Homes backing onto a creek, a wooded buffer or a drainage ditch see this pattern most, but any yard with a compost pile, bird feeder or loose trash can draw the same activity.
Roof rats in attics and trees.
Roof rats climb, and they favor attics, upper walls and mature trees with branches that reach toward a roofline. They are less common than Norway rats around Fairfax, but mature tree cover near the Historic District and older streets gives them a route that a Norway rat would not use. Scratching that seems to come from the attic rather than the crawl space is one clue we ask about on the call.
| Sign | Norway rat | Roof rat |
|---|---|---|
| Travel pattern | Ground level, burrows, foundations | Climbs, uses trees and roofline. |
| Common spots | Sheds, decks, fence lines, creek banks | Attics, upper walls, garages under trees. |
| Droppings | Blunt ends, about 3/4 inch | Spindle-shaped, slightly smaller. |
| First step | Ground-level burrow inspection | Attic and roofline inspection. |
Both rats need the same basic response: find where they travel and where they nest, remove the active animals, and close the entry points so new ones cannot follow the same path.
A burrow does not go away because the rat that dug it moves on.
Why rat colonies grow fast.
A female rat can have 4 to 6 litters a year, with 6 to 12 pups each time, and young rats can breed within a few months. A single burrow you notice in October can support a growing colony by the time spring arrives, especially if a nearby food source, such as an unsecured trash can or bird feeder, keeps supplying them through the cold months.
Because of that pace, removing a few rats without addressing the food source or sealing entry points usually means the population rebounds within weeks. Our approach targets both sides of the problem at once.
Not sure this matches what you are seeing? Describe it on the call and we will help you sort it out.
Call (888) 686-4821Treatment, sealing and yard changes together.
Rat control that lasts combines three things: removing active rats, sealing structural entry points, and reducing the food and shelter that drew them in the first place.
- We inspect burrows, fence lines, sheds and the foundation, along with attic and roofline access if roof rats are suspected.
- We set traps and, where appropriate, tamper-resistant bait stations along established travel paths rather than at random spots in the yard.
- We seal foundation gaps, vent openings and roofline access points with materials rats cannot gnaw through.
- We point out food sources, such as pet food left outside or an unsecured compost pile, that keep drawing new rats back.
Sealing multiple entry points across a property is covered in detail on our rodent exclusion page, and outdoor burrow treatment is part of our backyard and outdoor rodent control service.
Fence lines, sheds and outbuildings.
Older Fairfax properties near the Historic District often have a detached shed, garage or workshop separate from the main house, and each one is a potential rat shelter on its own. Newer homes closer to the city's edges can still have gaps under a deck or shed foundation that a rat finds within its first season nearby.
We check every structure on the property, not just the main house, since a rat burrow under a shed can support activity that eventually reaches the house itself.
Cold-season rat activity.
Rats push toward shelter as the weather turns cold, the same as mice do, but rats are more likely to stay outdoors in a burrow or crawl space rather than move fully indoors. A burrow near a foundation that seemed dormant in summer can become active again once temperatures drop and the rat looks for a warmer route inside.
What a rat visit involves.
A rat visit typically covers more ground than a mouse call, since burrows and travel paths can span the whole yard. Our rodent inspection and estimate service explains how we scope that inspection before any treatment begins.
Sources and standards
Public guidance behind the advice on this page. It describes general practice and rules, not a claim about any one provider.
- CDC: Hantavirus Prevention: The seal up, trap up, clean up approach to rodent-proofing a home that public-health guidance recommends.
- US EPA: Restrictions on Rodenticide Products: How federal rules limit consumer rodenticides to ready-to-use bait stations and keep second-generation anticoagulants for professionals.