San Diego Rodent Library
The rats and mice that get into San Diego homes, the signs they leave, and what actually keeps them out.
Roof Rat
The most common rat in San Diego. Slim, dark, a strong climber. Nests up high in attics, trees, and rooflines, and follows fruit trees, ivy, and utility lines to the roof.
Norway Rat
Heavier and stockier than the roof rat, and stays low. Burrows near water, sewers, drainage, and crawlspaces, entering at ground level around foundations.
House Mouse
Small, gray-brown, and active year-round here. Slips through gaps the width of a dime and stays close to food in kitchens, pantries, and garages.
Deer Mouse
More common where homes meet open space and canyons. Bi-colored, with a white belly. Tends to nest in sheds, garages, and outbuildings on the edges of town.
Signs you have a rodent problem
The earliest signs are usually sound and droppings. Scratching, gnawing, or scurrying overhead after dark points to roof rats in the attic. Droppings along walls, in the garage, or under the sink show where rodents are traveling. You may also find gnaw marks on food packaging, wiring, or irrigation lines, shredded insulation or paper used for nesting, grease marks where rodents squeeze through the same gap, or chewed fruit under the trees.
What actually keeps rodents out
Rodents come back when the entry points are never closed. That is why sealing is the core of real rodent control. We find the roof, vent, pipe, garage, and foundation gaps rats and mice use, seal them with materials they cannot chew through, and remove the rodents already inside with traps and bait. A follow-up visit confirms the activity has stopped. Trapping alone is a treadmill, sealing is what breaks the cycle.
San Diego rodents: FAQ
Common questions about identifying and controlling rats and mice in San Diego.
What is the most common rodent in San Diego homes?
The roof rat. The mild climate, fruit trees, ivy, palms, and canyons all favor roof rats, and they nest in attics after climbing in from the roofline. Norway rats and house mice are common too.
How can I tell rats from mice?
Rat droppings are large, up to three quarters of an inch, and concentrated along runways. Mouse droppings are small and pointed, about the size of a grain of rice, and scattered near food. Rats also leave coarser gnaw marks and grease trails.
Where do rodents usually get in?
Roof rats use the roofline, eaves, and vent gaps. Norway rats enter low around foundations and crawlspaces. Mice use small gaps under garage doors, around pipes, and along exterior doors.
What actually gets rid of rodents for good?
Sealing the entry points, not just trapping. Traps clear the rodents inside, but without sealing, new ones follow the same path back in. Sealing plus trapping plus a follow-up is what lasts.
Got rodents? Let's get them out.
Call now and connect with a local San Diego rodent exterminator. Describe what you are hearing or finding and get honest help. Same-day service is often available.