Why Your NYC Building Still Has Pests After Spray?
You finally booked the exterminator. They sprayed. You aired out the place. And then… you spot a roach in the bathroom, a mouse darting behind the stove, or fresh bed bug bites that make you question reality. In New York City, this is painfully common because in a multi-unit building, “spray” is usually just one small piece of the puzzle. NYC health guidance is blunt about what actually stops pests from coming back: remove their food, water, shelter, and pathways and fix building conditions like leaks, cracks/holes, and clutter. Spray kills some pests, but it doesn’t fix the building Pests don’t live in your apartment because they love your vibe. They’re there because the building offers: NYC explicitly tells residents to report the conditions that attract pests like leaks and cracks/holes, and escalate via 311 if management won’t fix them. So if your building still has pests after spray, it’s often because the habitat stayed intact. 9 Reasons NYC pests come back after extermination 1) Your unit got treated, but the building didn’t In NYC, infestations often bounce between apartments through shared walls, pipe chases, hallways, and trash areas. Treating one unit can become whack-a-mole unless the building coordinates inspections and fixes. 2) Entry points weren’t sealed (the #1 “silent failure”) If gaps stay open, pests treat your apartment like a subway stop. NYC materials on building pest-proofing emphasize sealing holes and cracks, door sweeps, and sealing around pipes, risers, gas lines, and electrical lines. 3) Leaks and moisture stayed unresolved Roaches and mice don’t just want food, they want water. NYC guidance repeatedly calls out fixing leaks and moisture problems as core to preventing reinfestation. 4) “Spray-only” is the wrong method for many NYC pests For example, NYC pest guidance warns against foggers and bombs and emphasizes safer, targeted approaches. And NYC’s pest-proofing guidance highlights cockroach bait gels/traps as a standard recommendation in IPM-style work. 5) Eggs and hidden harborages survived A treatment may knock down what’s visible, but pests hide in cracks, behind appliances, wall voids, and under sinks. Without sealing + follow-up, survivors repopulate. 6) Prep wasn’t done (or couldn’t be done) Many treatments depend on access: under-sink cabinets cleared, stove pulled out, clutter reduced. In real NYC apartments, “move everything” is often unrealistic, so the plan needs to adapt (more visits, targeted baits, sealing work). 7) No monitoring + no follow-up visit A legit program checks progress. IPM programs rely on a cycle of inspect → identify → monitor → evaluate → respond, not a one-and-done spray. 8) Overuse of pesticides can backfire NYC warns that pesticides can create health risks and linger on surfaces if misused.The goal is less routine pesticide use, more targeted control. 9) Food and trash access didn’t change NYC specifically recommends storing food in sealed containers and keeping garbage sealed/removed daily as part of keeping pests from returning. What you should expect after a treatment (and when it’s a red flag) It’s not unusual for residents to still notice pests after the first visit, especially in buildings with shared infestations and structural gaps. Red flags that suggest the plan is failing (not just “in progress”): Pest-specific reality checks (NYC edition) Roaches (especially German roaches) Why roaches return: water access + tiny gaps + neighbouring units + wrong method.NYC’s building materials specifically recommend cockroach bait gels/traps plus sealing and leak repair as core moves. What works better than “spray-only”: Mice and rats Why mice and rats return: entry points + trash access + exterior issues.NYC pest-proofing guidance calls out door sweeps and sealing holes/cracks and notes how small gaps can be enough for rodents. What actually moves the needle: Bed bugs Bed bugs are their own boss level. NYC guidance says to expect at least two treatment visits and a third follow-up to confirm elimination, and foggers/bug bombs are not effective for bed bugs. If your landlord isn’t responding, NYC guidance points residents to 311/HPD complaints pathways. The NYC building checklist that actually prevents reinfestation For tenants (what you can control) For landlords/managers (what must happen building-wide) NYC also tells residents: if management doesn’t fix the conditions that attract pests, call 311. The long-term solution: IPM (Integrated Pest Management) If you want pests gone for good, you want IPM, a strategy that treats the building like a system. At its core, IPM is a cycle of:inspect → identify → monitor → evaluate → choose the right control method, while reducing reliance on routine pesticide applications. In NYC apartments, that typically means: Conclusion Spraying can knock pests down but in NYC buildings, it rarely knocks them out. When roaches, mice, or bed bugs keep showing up after treatment, the real issue is usually the building environment: gaps they can enter through, moisture they can drink, and hiding places they can breed in. Until those conditions are fixed and the work is coordinated across units, pests will keep treating your building like a 24/7 buffet with free housing. If you are still seeing pests after a spray? Book an inspection and we’ll identify exactly where they’re coming from, seal key entry points, and build a treatment plan that actually holds. FAQs: 1) Why am I still seeing pests after the building was sprayed? Because spray doesn’t remove the root causes entry points, moisture/leaks, food access, and pests moving between units. NYC guidance emphasizes fixing conditions like cracks/holes and leaks alongside treatment. 2) How long after pest control is it normal to see roaches or bugs? A short period of sightings can happen as pests move through treated areas. But if you’re still seeing frequent activity after the first week especially in kitchens/bathrooms you likely need follow-up + sealing + moisture control, not just more spray. 3) Can my neighbors cause my apartment to keep getting pests? Yes. In NYC multi-unit buildings, pests travel through shared walls, pipe chases, risers, hallways, and utility openings. Treating one unit without building-wide coordination often leads to reinfestation. 4) Why doesn’t “spray-only” pest control work long term? Spray









