Roof Rats in Vallejo: Roof Rats vs Norway Rats and the Local Rat Problem

Vallejo’s rat problem

Rats are not new in Vallejo, but they have been getting more attention. In summer 2025 the city stepped up trapping and street sweeping after a rodent surge around downtown and the ferry terminal, as NBC Bay Area reported.

From what we see across the city, a few things keep rat numbers high here:

• Water on three sides. The Napa River, Mare Island Strait, San Pablo Bay and the Carquinez Strait give rats water and shoreline cover.
• Mild weather all year. Vallejo rarely freezes, so rats breed in every season.
• Lots of food. Restaurants downtown and along Sonoma Boulevard, backyard fruit trees, compost bins, bird feeders and pet food left outside.
• Older housing. Many homes in central and south Vallejo date back to the early and mid 1900s, with open eaves, worn vent screens and raised foundations.
• Dense greenery. Ivy, palms and overgrown hedges are classic roof rat homes.

When outdoor numbers are high, rats push into homes. That is when we get the calls about noises in the attic.

Roof rats vs Norway rats: quick comparison

Size and color alone can fool you. Young Norway rats are small and some roof rats are brown. The tail length, ears and where the rat lives are the more reliable clues. UC IPM’s Pest Notes on rats has good photos of both.

Roof rats: what they look like and how they live

Roof rats are agile climbers. You might see one running along the top of a fence or across a power line at dusk. They nest above ground in trees, dense ivy, palm fronds, woodpiles and attics.

They are also cautious. Roof rats avoid new objects for a while, which is why traps sometimes sit untouched for a few days. They like fruit, so homes with citrus, plum or avocado trees often have them. If you find half-eaten fruit still hanging on the tree or hollowed-out oranges, that is a strong roof rat sign.

Indoors, roof rats stay in the upper parts of the house: attics, false ceilings, the tops of walls and cabinets. Read more in our guide to rats in the attic and walls.

Norway rats: what they look like and how they live

Norway rats are heavier, stronger and ground-based. They dig burrows about three inches wide in soil along foundations, under concrete slabs, sheds, decks and woodpiles. Fresh dirt and holes near your foundation can be a sign.

In Vallejo, Norway rats are common near the waterfront, storm drains and older sewer lines. In homes they show up in crawl spaces, garages and basements, and in the lower walls. They are bolder than roof rats and will eat almost anything.

How to tell which rat you have

If you have not seen the rat, the evidence will usually tell you:

• Noises overhead, droppings in the attic: roof rats.
• Burrows by the foundation, droppings in the garage or crawl space: Norway rats.
• Gnawed fruit in the trees: roof rats.
• Holes chewed in garbage bags or compost: either, but often Norway rats.
• Droppings with pointed ends: roof rats. Blunt, fat droppings: Norway rats.

Our signs of rats and mice guide explains droppings, rub marks, tracks and gnawing in more detail.

Why the type of rat changes the treatment

Treatment that works for one rat often misses the other.

• Roof rats are controlled by trapping in the attic and along their travel routes, trimming trees and ivy back from the roof, and sealing the roofline, vents and eaves.
• Norway rats are controlled by trapping at ground level, closing burrows, sealing foundation gaps and crawl space vents, and removing ground-level shelter and food.

Some Vallejo homes have both. That is common on properties near the water with big yards and raised foundations. A full inspection, from the roofline to the crawl space, tells you where to focus.

Keeping rats out of your Vallejo home

You cannot control the rats on your street, but you can make your home a poor target:

1. Trim branches and ivy at least three feet back from the roof and walls.
2. Pick up fallen fruit and harvest ripe fruit quickly.
3. Bring pet food and bird seed inside at night.
4. Use bins with tight lids for garbage and compost.
5. Store woodpiles and boxes off the ground and away from the house.
6. Repair vent screens and close gaps around pipes, cables and AC lines.
7. Check the garage door seal and the corners at the bottom of the door.
8. Fix leaks and drippy outdoor faucets. Rats need water too.

For traps, placement and what to avoid, read how to get rid of rats.

When it is time to call us

If rats are already inside, prevention alone will not fix it. Call (707) 000-0000 if you hear rats in the attic or walls, see droppings indoors, or keep seeing rats outside your home. We inspect the whole property, identify the rat, trap, seal the entry points and follow up. Our rodent control in Vallejo page explains the full process, and the rodent removal cost guide explains what goes into the price.