Scratching In The Walls: Is It Mice, And Who Do You Call?

Scratching in a wall after dark, small dark droppings along a baseboard and a gnawed corner on a cereal box add up to mice. Noise overhead in the middle of the day, heavier and slower, usually means something larger. Settle that question first, because mouse work is about finding the entry and placing devices correctly, not about buying more traps.

Late September is when this starts in Stark and Summit County. Nights cool off, fields and gardens get cut back, and the food that kept mice outside all summer thins out in the same few weeks. The National Pest Management Association puts rodent pressure at roughly 21 million American homes invaded each winter, so a house that was quiet in August is in plenty of company by October.

How To Confirm It Is Mice

Sound alone is weak evidence. Physical sign is not. Walk the rooms next to where you hear the noise with a flashlight and check for these five things:

• Droppings. Dark, pointed and about the size of a grain of rice. Along a wall, behind the stove, inside a drawer or under a sink.
• When you hear it. UC IPM describes the house mouse as active mainly at night, so noise that starts at dusk fits. Activity in broad daylight suggests either a large population or a food supply that ran short.
• Gnawing. Shallow paired grooves on cardboard, food packaging, plastic bins or the edge of a cabinet.
• Nesting material. UC IPM describes mouse nests built from finely shredded paper and other fibrous material, tucked into a wall void, a cabinet or upholstered furniture.
• The pets. A dog or cat fixed on one spot along a wall for several days is reading something you cannot hear.

Where you find the sign narrows the search more than most people expect. UC IPM puts a house mouse within about 10 to 30 feet of its nest, so droppings in one kitchen drawer point at that end of the house, not at the whole building. If you want the full identification walk through, including how a mouse differs from a rat or a deer mouse, we covered it in rats or mice.

Why It Is Worth Acting On Now

Two reasons, and neither is squeamishness. The first is health. The CDC counts rodents among the carriers of more than 35 diseases worldwide, passed on directly through droppings, urine, saliva and bites, or indirectly through ticks, mites and fleas that fed on an infected animal. The second is the building itself. Rodents gnaw constantly, and the National Pest Management Association names chewed wiring as one of the real risks, with the fire hazard that comes with it.

Timing matters too. A mouse that gets in during the last week of September has the whole winter to breed inside a heated wall. The Ohio Department of Natural Resources gives the house mouse several litters a year of 3 to 11 young, with a gestation of 18 to 21 days. Dealing with it in September or October means dealing with what just walked in, rather than with what a heated wall void produced by February.

Who Do You Actually Call?

Not every noise in a wall belongs to the same trade, and calling the wrong one costs a week. Match your situation to the row.

What A Professional Does That A Trap Line Does Not

Most of the visit is inspection. The work runs the outside of the building at ground level and up: utility penetrations, the dryer vent, the gap under a garage door, siding corners, the sill plate, the point where a deck ties into the house. Then the inside, following the sign you found back toward the void it came from. University of Missouri Extension puts the threshold at a quarter inch, so anything wider than that is a candidate, and on older Canton and Massillon housing stock there are usually more of them than a homeowner expects.

Sealing is the part that lasts, which is why professional rodent management leads with exclusion, closing gaps as small as a dime, and then control and monitoring for whatever is already inside. Placement follows the biology: devices go within that 10 to 30 foot range of the nest and along the wall lines mice travel, not in the open floor where people would put them. Monitoring is what tells you it worked, since a quiet week is not proof by itself.

The Part Store Bought Bait Cannot Do

Consumer rodent bait is regulated tightly, and it is worth knowing why. The EPA requires consumer products to be sold with a bait station that securely contains the poison, no longer permits loose bait forms, and caps how much poison a consumer product may contain. Second generation anticoagulant baits are kept out of consumer products entirely, though the EPA does allow pest management professionals to use them in homes.

The stations themselves are graded. The EPA describes ready to use Tier 1 stations as resistant to tampering by young children and by dogs and weather resistant, usable indoors and outdoors within 50 feet of a building, while a Tier 4 station protects bait only from dust and may be used indoors only where young children and pets have no access at all. On a house with a toddler or a beagle, that grading is what decides where a station can responsibly sit. All of State Termite's treatments are pet safe and kid safe, and mice and rats are covered under State Shield Essential, the quarterly plan, along with ants, spiders, centipedes and cockroaches. If pests come back between treatments, so do we, at no cost.

None of it closes the hole, which is the point. Bait and traps reduce what is inside. Only sealing changes what can come in next October.

What To Do Before The Visit

• Write down times and rooms. Three nights of notes on where and when you hear it is genuinely useful to whoever inspects.
• Photograph the sign before you clean. Droppings, gnaw marks, the gap you found outside.
• Do not vacuum or sweep droppings. The CDC advises against it because stirring the material can put particles into the air. Gloves, disinfectant, let it sit, wipe it up with paper towels.
• Secure the food supply. Pet food in the garage, birdseed, grass seed and anything in a paper bag on a basement shelf. Glass or hard plastic containers, lids on.
• Leave any traps where they are. Moving them every morning resets whatever progress they were making.

State Termite has worked Stark, Summit, Portage, Wayne and Tuscarawas counties since 1933, from the office in North Canton and a second one in Hartville. If the scratching is keeping somebody awake, get a free estimate or call 330-494-6199, and tell us which room it started in and what time of night you hear it.