Roof Rats in St. George: What Homeowners and Buyers Should Know

Until a few years ago, rats were rarely seen in St. George. Since about 2021, pest control companies have reported a steady rise in roof rats, and by 2026 local news was covering neighborhoods with large infestations and homeowners facing major repair bills. In one reported case, rats chewed through water lines and HVAC components in a home's attic, causing flooding and about $85,000 in damage. Here's what roof rats are, why they've spread here, and how homeowners and buyers can protect themselves. To browse homes, see St. George homes for sale.

What Roof Rats Are

Roof rats are agile climbers that prefer to live up high, in trees, attics, wall voids and rooflines, rather than burrowing. They're slimmer than the Norway rats common in many cities and can squeeze through gaps about the size of a quarter. Because they nest overhead and come out at night, an infestation can go unnoticed until damage appears.

Why They're Spreading in St. George

Pest control companies point to a few local factors:

• Water: in a dry climate, especially after dry winters, rats move into homes looking for water and chew into plumbing to get it.
• Growth and construction: land clearing for new development can push rodents into nearby established neighborhoods.
• Food and cover: fruit trees, bird feeders, pet food, chicken feed and dense landscaping provide food and shelter.
• Shared walls: condos, townhomes and apartments let rats move between units, and well-watered areas such as golf courses have seen spikes.

Signs of Roof Rats

• Scratching or scurrying sounds in the attic or walls at night
• Droppings in the attic, garage or behind appliances
• Chewed wiring, insulation, irrigation lines or fruit
• Grease marks along beams, pipes or entry points
• Unexplained water stains or leaks, which can mean chewed pipes

How to Keep Them Out

1. Seal entry points. Close gaps around roof vents, HVAC and plumbing penetrations, garage doors and eaves with steel mesh, hardware cloth or metal flashing, since rats chew through foam and plastic.
2. Trim trees and shrubs so branches don't touch the roof or walls.
3. Remove food and water: pick up fallen fruit, store pet food and feed in sealed containers, and fix leaky irrigation.
4. Clear clutter such as woodpiles and debris near the house.
5. Use professional help for active infestations. Trapping and baiting work best as part of a plan from a licensed pest control company, especially in attached housing where neighbors need to act too.

Rodents can carry diseases, so avoid handling droppings or nesting material directly. The CDC's guide to cleaning up after rodents covers how to do it safely.

What Homebuyers Should Check

• Ask the seller about any history of rodents, pest treatment or water damage.
• Have the inspector check the attic for droppings, chewed wiring, damaged insulation and gaps at vents and penetrations.
• Look closely at attached homes, since shared walls and attics make one unit's problem everyone's problem. Ask the HOA whether it runs a pest control program.
• Review insurance coverage. Many homeowners policies exclude damage caused by rodents, though sudden water damage may be treated differently. Ask the insurer before you need it.

For more on preparing for an inspection, see this guide to home inspections in St. George, and for other local realities, the 10 realities of moving to St. George.

Bottom Line

Roof rats are a newer problem in St. George, but they're manageable with prevention: seal the house, remove food and water, keep trees trimmed back, and get professional help early. Buyers should add a careful attic inspection to their checklist. For help finding a home, contact Best Utah Real Estate.