How do I tell which fly I actually have?
Two minutes of looking saves two weeks of searching the wrong half of the property. Sort by size, color, and how the fly moves. A dull grey quarter inch fly that lands on surfaces and gathers at sunlit glass is a house fly, and it came from outdoors. Search the bin, the pad under it, pet waste, and clipping piles within a short flight of the nearest door. A shiny blue or green fly indoors, or a grey fly with a checkered abdomen, means a carcass. Both point at the same search: attic, wall voids, chimney, and under the crawl area if you have one. A small fuzzy grey fly that sits flat and still on tile is a drain fly, living in pipe film. A small dark fly that runs a few inches before flying is a phorid. That one is the Fort Worth problem child, because Texas A&M AgriLife Extension links it to sewage under slabs and it will outlast any amount of surface cleaning. Write down which one you have before you buy anything, because the four searches barely overlap.
The Fort Worth fly year, month by month
February and March are the cheap months. Nothing much is breeding yet, so this is when door sweeps, screen repair, drain brushing, and a bin wash pay the most for the least effort. April opens the outdoor season. Temperatures are already warm enough for a full cycle to close, and material sitting in yards starts turning over. June through September is the hard stretch. With average highs at 96F, house fly development runs near the seven day end of the Texas A&M curve, and weekly sanitation becomes the minimum rather than a goal. A single missed collection genuinely changes how many flies you have two weeks later. October and November stay productive but calmer, which makes them the best window for a careful inspection: sources are still active enough to trace, without the volume of midsummer. December through March, with lows averaging 35F, outdoor pressure drops away. Anything still flying indoors in those months is a drain, a plumbing leak, or a houseplant, and it should be investigated that way rather than blamed on the weather.
Why slab homes here keep producing humpbacked flies
Phorid flies are the reason people call a second and third company. The pattern is always the same: every drain gets cleaned, the trash gets handled, the flies pause for a week, then they come back. Texas A&M AgriLife Extension names sewage from broken lines under slabs as a recurring indoor source in Texas, and slab construction is everywhere across the Fort Worth area. A hairline crack in a drain line lets water and waste seep into the soil under the concrete. That soil stays permanently damp, stays temperature stable, and is completely out of reach of anything you can spray. The development window makes it worse. Texas A&M gives phorids 14 to 37 days from egg to adult, so after any repair you should expect stragglers for weeks before judging whether it worked. What actually resolves it is a camera inspection of the drain lines, then a plumbing repair. A provider who tells you that early, instead of selling a monthly program that cannot reach the source, has earned some trust.
What a first visit should cover
A good first visit is heavy on questions and walking and light on equipment. If someone arrives, sprays a baseboard, and leaves in ten minutes, you paid for a delay. Expect questions first: which rooms, what time of day, how long it has been going on, and whether anything changed recently such as a remodel, a new pet, a plumbing repair, or new landscaping. Those answers separate indoor sources from outdoor ones before anyone opens a bag. Outside, the walk should cover the container and the ground beneath it, the pet area, compost, stored clippings, and any low spot that stays wet after rain. Inside, water gets run in every drain, the laundry standpipe and condensate pan get checked, cabinets get opened to look for slow leaks, and potted plant soil gets a look. A useful confirmation trick for small flies is taping a clear card sticky side down over a suspect drain overnight. Adults emerging stick to it, and in the morning you know which pipe is producing instead of guessing.
Comparing two fly quotes in Fort Worth
Two proposals with the same number at the bottom often describe completely different work. Read the content before the total. Check whether each one names a source. A quote saying the flies are breeding in the utility room floor drain and the bin pad behind the garage came from an actual inspection. One that lists species and a treatment method could have been written for any address in Fort Worth without anyone leaving the truck. Count the return visits. Fly work needs at least one, because you are waiting out a generation that was already developing. Ask how many are included, over what window, and what happens if flies persist past it. Read the sanitation section. No plan works without material removal, so it should say in writing who removes what and how often. When that part is one vague sentence, the whole burden has quietly been handed to you. Finally, ask what happens if the trail leads under the slab. The right answer names a plumbing camera, not a bigger pesticide package.
Renters, landlords, and who fixes what
Fly disputes in rentals usually come down to one question: is this a housekeeping issue or a building issue. The answer is often visible from the species. Small flies limited to one apartment, tied to a kitchen bin or a produce bowl, are typically a tenant matter and are fixable in a weekend with a brush and a trash routine. Small flies coming from a shared floor drain, a laundry room, a trash chute, or a slab area belong to the building. So does a carcass in a wall void, since nobody can open a wall without the owner. Document it either way. Note the date the flies started, which room, roughly how many per day, and what you already cleaned. A count that stays flat after two weeks of good sanitation is the strongest argument that the source is structural. For a landlord, the cheaper move is almost always the inspection rather than repeated spraying. Recurring service on a property with a broken line under concrete becomes a subscription to the same problem.