Rodent Control in Pomona, CA

Rats and mice do not break into a Pomona house. They walk in through a gap that was already there: a torn crawl space vent screen, the space behind a weep screed, a hole someone cut for a drain line decades ago and never patched. Finding those openings and closing them is the job. Trapping what is already inside is the easy part.

Why Pomona homes get rodents

Pomona sits inland, so summers run hot and dry and winters stay mild. Rats come indoors looking for water as much as food, and no cold snap knocks the population back in January. The housing stock does the rest. Lincoln Park alone has 821 structures built between the 1890s and the 1940s, most on raised foundations with crawl spaces and original wood vents. Wilton Heights and Hacienda Park are similar in age. Phillips Ranch is newer and mostly midcentury, but attached garages and ducted HVAC give rodents their own set of routes. Mature fruit trees and fan palms left over from the valley's citrus years put roof rats within jumping distance of a roof line.

Signs it is rodents and not the house settling

Most Pomona callers hear something before they see anything. Check for:

• Scratching or running overhead that starts 30 to 60 minutes after sunset and stops near dawn
• Dark droppings along baseboards, under the kitchen sink, or on top of ceiling joists
• Greasy rub marks on rafters, pipe runs and fence tops, left by rats using the same route every night
• Gnaw marks on wiring, irrigation line, or the corner of a cardboard box in the garage
• Shredded paper, insulation or fabric pulled into a corner as nesting material
• A sharp ammonia smell when you open the attic hatch
• A dog or cat that will not leave one section of wall alone

One sign is worth checking. Three or more usually means an established population rather than a stray.

Where they get in

Every job starts with the same list, because rodents in Pomona are not creative so much as persistent. The usual openings are crawl space and foundation vents with failed screens, the corner gap under a garage door, dryer and bathroom vent hoods with broken flaps, the gap where plumbing or electrical enters the wall, roof to fascia junctions and lifted tile, gable and eave vents, the chase where HVAC passes through the ceiling plane, and damaged weather stripping at exterior doors.

Size matters more than people expect. A rat gets through anything wider than half an inch. A house mouse needs only a quarter inch. That is why a house can look sealed and still be open.

Which rodent you have changes the fix

Roof rats are the most common in Pomona. They climb, they live high, and they get in at the roof line through a gable vent, a lifted tile, or a branch touching the eave. Attics and palm crowns are normal habitat for them here.

Norway rats stay low. They burrow under slabs, sheds and sewer lines, and they enter through crawl space vents, the corner gap under a garage door, or a broken cleanout.

House mice need only a quarter inch gap. They nest in attic insulation, behind stove and dishwasher panels, and inside stored boxes, and they breed year round.

Ground squirrels and pocket gophers stay outside. They are a yard and slope problem, common near Ganesha Park and the open ground around the Fairplex, and they are handled differently from anything living in your walls.

We trap and seal, and we do not use poison

California has closed off most rodent poison. AB 1788 placed a moratorium on second generation anticoagulant rodenticides in 2020. AB 1322 added diphacinone at the start of 2024. AB 2552, signed on September 25, 2024, added chlorophacinone and warfarin, with penalties reaching $25,000 per day for each violation.

The legal side is only half of it. Poison does not close the hole the rat used, so the next one walks in on the same path. It also kills the animal somewhere inside your wall or attic, which turns a rat problem into a smell problem and then a fly problem. Trapping gives us the carcass. Sealing stops the replacement.

How a Pomona job runs

1. Inspection. We walk the roof line, attic, crawl space, garage and exterior perimeter, and mark every opening a rodent can use. You get photos of what we find.
2. Identification. Droppings, runways, rub marks and burrows tell us whether you have roof rats, Norway rats or mice, which decides where traps go and how tight the sealing has to be.
3. Trapping. Snap traps go on the active runways found during the inspection, not in random corners.
4. Exclusion. Openings are sealed with material rodents cannot chew through. Vents get new screens. Weep screeds, pipe penetrations and roof junctions get closed.
5. Cleanup. Droppings, contaminated insulation and nesting material come out, and the area is sanitized so old scent trails stop pulling new rats in.
6. Follow up. We return to clear traps and confirm activity has stopped before closing the job.

Not every property needs all six in the same depth. A garage with one mouse is not an attic with an established roof rat colony, and the inspection is what tells us which one you have.

What it costs, and what moves the price

The inspection and the written quote are free. After that the number depends on the size and age of the property, which rodent it is, how many entry points the inspection turns up, whether attic or crawl space access is involved, how much contaminated insulation has to come out, and how many follow up visits the job needs. Nobody can give you a real figure over the phone without seeing the building, and a company that quotes a flat price before inspecting is guessing.

The damage, without the scare tactics

Rodent damage in a Pomona home is mostly three things. Gnawed wiring in an attic or wall void, which is the one that actually matters because it is a fire risk and you cannot see it. Insulation that gets flattened, shredded for nesting and soaked with urine, which stops working and has to be replaced rather than cleaned. And contamination in kitchens, pantries and storage areas, where droppings and urine get onto surfaces and into packaging.

The sensible precautions are simple. Do not sweep or vacuum droppings, because that puts dust into the air. Keep an affected attic or crawl space closed off until it has been cleaned properly. If anyone in the house has a breathing condition, leave that space alone and let someone handle it with the right equipment. That is the whole of it. Anyone quoting you on fear rather than on what they found in your attic is selling, not inspecting.

Keeping them out after the job

• Cut tree limbs, palm fronds and ivy back so nothing touches the roof or the eaves. A roof rat needs a bridge.
• Pick up fallen citrus, avocado and other fruit. A productive tree in a Pomona back yard will feed a colony on its own.
• Move pet food, bird seed and grass seed into sealed containers, and stop leaving pet bowls out overnight.
• Fix the water first. A dripping hose bib, a leaking irrigation line or a full condensate pan matters more here than crumbs do.
• Keep bins closed, and off the ground where you can, through the summer especially.
• Clear stacked wood, cardboard and stored boxes off the ground and away from exterior walls.
• Check crawl space and attic vent screens once a year. They rust through, and that is how most Pomona homes quietly lose the seal.

None of this clears an active infestation on its own. It is what stops the next one.

When it is worth calling someone

Some of this you can handle yourself. One mouse in a garage, caught in a trap, with no droppings anywhere else, is one mouse. Call someone when:

• You hear movement overhead night after night
• Droppings keep reappearing after you clean them up
• There are gnaw marks on wiring or a chewed irrigation line
• Your own traps keep catching, week after week
• You have found an entry point you cannot reach or seal safely
• The property is a rental, a restaurant or any food handling business

Repeat catches are the clearest signal of all. It means something outside is still walking in.

Renting in Pomona, or dealing with a problem next door

Under California law, whoever is in possession of a rodent infested property has to eliminate the infestation and correct the conditions causing it, not just set a few traps. In rental housing that responsibility normally sits with the landlord. If a property owner will not act, the Los Angeles County Department of Public Health Environmental Health Division takes rodent complaints and inspects unlicensed sites in Pomona. We can provide a written inspection report you can hand to a landlord or a property manager.

Rodent Control Services in Pomona, CA