Rodent Control in Auburn, WA: Keeping Rats and Mice Out of Damp Puget Sound Homes

What to look for

Auburn deals with four rodents, and each favors a different part of the property. Roof rats climb; in the Puget Sound area they're known for living in attics, which they reach by fences, wires and overhanging branches. Norway rats dig, tunneling under decks, sheds and slabs, and roughly 40 inches of rain a year keeps the soil soft enough to make that easy. House mice move into kitchens, wall voids and garages through gaps no wider than a pencil. Deer mice are the health concern: the Washington State Department of Health says infected deer mice live throughout the state, and they tend to settle in sheds, garages and other outbuildings. With winter lows averaging around 36F, none of these animals face the kind of hard freeze that thins rodent numbers in colder places. Breeding slows in the cold months but does not stop, so a few animals spotted in October can turn into a crowded attic by spring.

• 1Scratching or scurrying in the ceiling after dark, the classic roof rat complaint.
• 2Dark, spindle-shaped droppings about the size of a raisin in insulation or along the garage wall.
• 3Tiny, rice-like mouse droppings in drawers, under the sink or behind the stove.
• 4Greasy rub marks on beams, baseboards and the spots where pipes enter a wall.
• 5Fresh burrow holes with fanned-out soil beside the foundation, under a deck or below a compost bin.
• 6Footprints about 1/2 inch long in dust or on a muddy sill, which WDFW describes as typical for rats.
• 7Shredded paper, fabric or insulation packed into a nest inside a stored box or shed corner.

Treatment options and typical costs

Prices are typical published ranges. Ask what’s included before you compare quotes.

Roof rat or Norway rat: which one is in your Auburn house?

UC IPM notes that Norway rats raise 4 to 6 litters a year while roof rats have 3 to 5 litters of up to 8, so either one rebuilds quickly if the openings stay open. Norway rats call for foundation work, burrow monitoring and exterior stations. Roof rats call for tree trimming, roofline sealing and attic trapping. The difference shapes the plan. The Washington Department of Fish and Wildlife describes rat footprints about 1/2 inch long, which helps separate rats from mice in dusty spots. Burrow openings with fresh dirt by the foundation, gnawed holes at the bottom of a garage door, or activity in a crawlspace point to Norway rats. Footsteps and scratching overhead at night point to roof rats. Listen and look. Norway rats are heavier, stay low, and dig burrows under decks, sheds, slabs and woodpiles. Roof rats are agile climbers that run along fences, power lines and branches, then nest high in attics and the tops of walls. Auburn homes deal with both species, and they split the house between them. Where you notice the activity usually tells you which rat you have.

How rodent pressure shifts through the year in Auburn.

Summer is the easiest season to seal the house, because fewer rodents are inside to get trapped behind new barriers. June through August, with highs around 77F, rats forage outdoors on garden produce, fallen fruit, pet food and bird seed. Air them out before you start, and wet everything down rather than sweeping. Sheds, detached garages and storage rooms that sat closed all winter may hold droppings and nests. March through May brings spring cleaning, and that's when deer mice become a health issue. Average lows near 36F are cold enough to keep rodents indoors but not cold enough to kill off outdoor colonies, so roof rats in attics and mice in wall voids keep breeding through the dark months. December through February rarely shuts things down. This is when most people first notice a problem. Nights cool off, the rain returns in earnest, and mice and Norway rats that spent the summer outside start hunting for dry nesting spots in garages, crawlspaces and walls. September through November is the busiest stretch in Auburn.

What a good first inspection should cover.

If someone proposes a monthly bait contract without ever going into the attic or crawlspace, keep looking. Do they seal entry points themselves or refer that work out? What's the plan for droppings and insulation? How often will they return to check traps? Will they use snap traps, bait stations or both, and where? Which species do they think it is, and what tells them so? Ask a few direct questions. A written list of entry points is the most valuable thing you get from the visit, because it shows exactly what sealing involves and lets you compare one quote against another. Ask them to show or photograph what they find: droppings, rub marks, burrows, chewed vents and gaps. In a climate as damp as western Washington's, they should also check for softened wood around vents, fascia and sill plates, since rodents chew wet wood more easily. Expect the provider to go into the attic, look into the crawlspace if you have one, and walk the outside along the foundation and roofline. A useful rodent inspection covers the whole structure, top to bottom, and it takes time.

Deer mice, sheds and hantavirus in the Auburn area.

If the contamination is heavy, ask a provider whether they handle cleanup and what protective gear their crew wears. Never sweep or vacuum, because that lifts the virus into the air you breathe. Spray droppings and nests with a solution of 1.5 cups of bleach per gallon of water until soaked, wait 5 minutes, then wipe up with paper towels and seal everything in a bag. Put on rubber or plastic gloves. Open doors and windows and leave the space alone for 30 minutes. The CDC cleanup steps are simple. For Auburn households, the risky jobs are opening a shed after winter, clearing out a detached garage, or shifting boxes in a storage room where deer mice have been living. People usually get sick by breathing dust from dried droppings, urine or nesting material. Nationally, the CDC has counted 890 cases since 1993, with 94% of them west of the Mississippi. State health officials count 1 to 5 Washington cases annually, with about one death for every three people diagnosed. Hantavirus is rare in Washington, but it is serious, and the deer mice that carry it live in every part of the state.

How to compare two rodent quotes for an Auburn home.

A somewhat higher quote that seals the house usually costs less over time than a cheaper one that only traps. Ask how long return visits are covered and what conditions cancel that coverage, since unsealed openings or later construction are often excluded. Finally, read the terms for what happens if rodents come back. Will the crew follow the CDC bleach method? Is insulation removal part of the price or a separate line? Then compare cleanup. A quote with several follow-up checks over a few weeks is a different product from one that sets traps once and leaves. How many visits are included, how far apart, and who removes the catches? Next, look at trapping. Hardware cloth and sheet metal outlast foam on its own. Does each quote list specific entry points, such as crawlspace vents, roof returns, utility lines and garage door corners, along with the material for each? Start with exclusion. With a median home value near $530,000 in Auburn, the bigger financial risk is chewed wiring, soiled insulation and moisture damage, not the price of a few traps. Put the quotes side by side and compare what's included, not just the bottom line.

Simple ways to keep rodents away

• Trim tree limbs and shrubs back from the roofline so roof rats can't jump onto the house.
• Cover crawlspace and attic vents with sturdy hardware cloth instead of window screen.
• Pack small gaps around pipes with steel wool, then seal over it with caulk.
• Stack firewood and lumber off the ground and away from the siding.
• Use a closed compost bin and leave out meat, dairy and cooked food.
• Rake up fallen fruit and spilled bird seed, which feed rats through the wet months.
• Keep pet food and chicken feed in metal cans with tight lids.
• Replace worn door sweeps on the garage and exterior doors, where mice simply walk in.

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