Coming Home After a Pest Control Treatment
Why this matters
Most pest control treatments ask very little of a household, but what they ask is specific, and it happens in the first few hours and the first few weeks. Come back in before a spray has dried and a child or a dog can carry it on hands and paws. Wipe the baseboards the next morning and you can remove the treatment you paid for. Spray a store-bought product on a trail of ants that is feeding on bait and you can undo a week of progress in a minute.
And the thing that worries people most, seeing more insects after a treatment than before, is very often a sign the treatment is working. This card explains what to do when you come home, what to expect over the following weeks, and which signs mean you should call the company back or call for help.
The label and the tech's instructions are what you follow
Every pesticide product sold in the US carries a label approved under federal law, and the company is required to use the product the way that label says. For you, the useful part of the label is usually one or two sentences about when people and pets can be back in a treated area. On many household and lawn products that wording is "until sprays have dried" or a stated number of hours, and some products add instructions such as removing pets or covering fish tanks.
The technician knows which products went where and reads those instructions for you. If they left a written notice, a door hanger or a service ticket, it should say what was applied, where, and when you can go back in. Keep it. If they only told you out loud, write it down with the time.
Some states also require a posted sign at the edge of a treated lawn for a stated period, and some let neighbors sign up to be notified before an application next door. Those rules are set by each state, and the company is responsible for following them. See related: Pesticide Posting and Re-Entry Notification.
Before the visit, tell the company about anyone who needs extra care: an infant, a pregnant household member, someone with asthma or chemical sensitivity, and every animal in the house, including fish, birds, reptiles and cats. Some products are a poor fit for some animals, and the tech can only choose around what they know.
What the different treatments ask of you
Treatments differ a lot in how much they ask. The tech should tell you which kind you had.
| Treatment | Where it goes | What it asks of you |
|---|---|---|
| Interior crack-and-crevice spray | Thin bands along baseboards, under sinks, into gaps | Stay out of treated rooms until dry; do not wipe treated edges for the period the tech gives |
| Gel or bait stations | Small dots or closed stations in cabinets, behind appliances | Leave them alone; do not clean them up or spray near them |
| Flea treatment | Carpets, pet bedding areas, sometimes the yard | Stay off treated floors until dry; then vacuum often (see below) |
| Exterior perimeter spray | A band around the foundation, around doors and windows | Keep kids and pets off the band until dry; do not hose it off |
| Lawn or yard spray | Turf, beds, shrubs | Keep everyone off until dry; follow any posted sign; hold off watering if told |
| Granules | Spread on lawn or beds | Follow the watering instruction; keep pets off until watered in, if told |
| Mosquito barrier spray | Undersides of leaves, shrubs, shady areas | Stay out of the yard until dry |
Coming back into the house
Wait the full time. Use the time on the notice, not a guess. On a warm, dry day a light interior or perimeter spray often dries within an hour or two, but humidity, shade and cool weather stretch that, and some products set their own longer times. If you are not sure, call the company and ask.
Keep children and pets out of treated areas until they are dry, even after the rest of the house is fine to use. Babies and pets spend their time on the floor and put their hands and mouths on everything.
Open windows if the tech suggests it. Some treatments leave a faint odor for a few hours. Fresh air helps; the tech or label will say whether it is needed.
Put things back where they were, then leave the treated edges alone. You may have moved food, dishes, toothbrushes and pet bowls out of the way. Put them back, and wash pet bowls if they were left out. Do not wipe, mop or steam-clean the baseboards and cabinet edges that were treated until the tech's stated time has passed; interior crack-and-crevice treatments are meant to stay in place for weeks.
Fish tanks. If the tech asked you to cover an aquarium, keep it covered with plastic wrap or a damp towel and turn off its air pump until the time they gave, because the pump pulls room air through the water. Turn the pump back on as soon as the cover comes off; fish need it. Birds and small caged animals are often moved to another room or out of the house during treatment, because their breathing is especially sensitive.
Why you may see more insects for a while
This is the part that surprises people, and it is normal for most treatments.
Baits draw insects out. Ant and cockroach baits work slowly on purpose: the insect eats the bait and carries it back to the colony or nest, where it reaches insects you never see. For the first several days you may see more ants on the bait, or cockroaches out in daylight, which they normally avoid. Leave them alone. Spraying a store-bought insecticide on a bait trail kills the carriers before they deliver it, and can make the bait less attractive.
Some sprays work through contact, slowly. Many modern perimeter products are designed so insects do not notice them, walk through, and die over a day or more. You may find dying or slow-moving insects inside for a while.
Fleas hatch in waves. Flea eggs and larvae are killed by treatment, but fleas in their cocoon stage are protected and keep emerging for a few weeks. Vacuuming every day or two, including under furniture and along edges, coaxes them out of the cocoon to meet the treatment, and empty the vacuum or its bag into an outdoor trash can each time. Treat the pets themselves only with what your veterinarian recommends; some dog flea products are dangerous to cats.
Disturbed insects move. A treatment can push insects out of wall voids and into the open before they die.
A rough guide: for ants and cockroaches, activity often rises for a few days and then falls off over one to two weeks. For fleas, expect some for two to three weeks. If you are seeing as many or more insects after about two weeks, call the company. Many companies include a return visit between scheduled services for exactly this; ask what yours offers.
Worked example: an ant treatment in a house with a toddler, a dog, a cat and a fish tank
The setup. Odorous house ants in the kitchen. The tech treated at 10 a.m.: bait stations inside two kitchen cabinets and behind the fridge, and a liquid perimeter spray around the outside foundation, about a 3-foot band at the base of the walls. The family had told the company about a two-year-old, a dog, an indoor cat and a 30-gallon fish tank in the living room. The day was 85 F and sunny.
What the tech left. A service ticket naming both products and where they went, with: "Stay off the outside treated band until dry, about 2 hours today. Inside, baits only, no spray. Do not spray anything on ants near the baits. Fish tank does not need covering for this visit." The tech had placed the inside stations where the toddler and the cat could not reach them, inside cabinets with child latches and behind the fridge.
Coming home. The family came back at 1 p.m., 3 hours after the treatment, an hour past the tech's 2 hours. The toddler and the dog stayed inside and the back door stayed closed until the owner walked the foundation band and confirmed it looked and felt dry, including the shaded north side by the hose bib, which was the last part to dry. The dog went out on a leash to the far side of the yard that first afternoon, away from the band.
Day 3. A line of ants was crossing the counter to the cabinet with the bait station, more than the family had seen before. The older child wanted to spray them. The owner left them alone and wiped only the counter top, not inside the cabinet.
Day 6. Fewer ants, mostly at the station itself.
Day 12. No ants on the counter for two days running. The owner noted it on the service ticket and kept it with the rest of the house paperwork.
What would have changed the plan.
- If the tech had sprayed inside, the toddler and the cat would have stayed out of those rooms until the interior spray dried, and the baseboards would not have been wiped for the period on the ticket.
- If it had rained hard within an hour or two of the exterior spray, some products need that time on the surface first, and the call to make is to the company to ask whether the band needs another application, not to re-spray it yourself.
- If ants were still as busy at day 12 as at day 3, that would mean the bait was not being taken or a second colony was involved, and that is a call for a return visit.
Signs that mean call for help, not wait
Call 911 if anyone has trouble breathing, a seizure, collapses, or is hard to wake after an exposure.
Call Poison Control at 1-800-222-1222 for any person who got a product on skin or in the eyes, swallowed some (a toddler with a bait in hand counts), or feels unwell after coming home: headache, nausea, dizziness, eye or throat irritation. Have the product name from the service ticket ready.
For a pet, call your veterinarian or an animal poison control line if a pet ate bait, licked a treated area, or is drooling, vomiting, trembling or unsteady.
Call the pest control company for anything that is not urgent but not right: a strong odor that lasts past the first day, treatment in a place you were told it would not go, stains, or insects still active past the two-week mark.
References
- See related: Pesticide Posting and Re-Entry Notification
- The product label and the company's service ticket, which set re-entry and care instructions for your treatment
- Poison Control: 1-800-222-1222 in the US
- See related: Your House Records File and What Goes In It