text: I'm sure you're aware that you have to find their breeding site. Once the site is found it must be thoroughly scraped, cleaned, and dried. \n\nThe locations vary widely, but are usually associated with rotting fruit, vegetables or meat, wet organic soil, potted plants, cut flowers, garbage disposals, pet cages and floor drains. \n\nLarge infestations of these flies are often the result of broken drains or garbage disposals that allow organic matter to accumulate in out-of-the-way places such as wall voids, under floors, in basements, or in the soil of crawl spaces. Phorid flies often serve as an indicator of a broken sewage line. As organic-rich waste-water passes through a damaged line, some of the solution seeps into surrounding soil. This can provide the perfect breeding ground for phorid flies. If you have an ongoing phorid fly problem, consider having the sewage lines inspected for leaks and repaired as needed