National City has some of the oldest housing stock in the South Bay, and older homes tend to have the most rodent entry points. Decades of settling, past repairs, and add-ons leave gaps at the roofline, around utility penetrations, and along foundations that rats and mice are quick to find. The bay and the Sweetwater channel nearby add moisture and cover that Norway rats favor.
Roof rats climb into attics here just as they do elsewhere in San Diego, using trees and fences to reach the roof. Norway rats stay lower near the channel, drainage, and crawlspaces, burrowing around foundations. House mice are a constant in the older kitchens and garages, entering through small gaps and breeding through the mild winters.
We handle National City homes by inspecting the full exterior and interior, sealing the entry points with materials rodents cannot chew through, and removing the active rats and mice with traps and bait placed along their runways. On older homes the sealing is detailed work, because there is rarely just one way in, and closing all of them is what keeps the fix from unraveling.
A follow-up visit confirms the rodents are gone rather than assuming the traps did the job. Call 619-353-8532 to reach a rodent exterminator who serves National City and the South Bay.