There are actually 3 kinds of roaches that we deal with in the greater Philadelphia region; German, American, and Oriental. Lighter infestations can be cleared up in 1-3 visits and some take ongoing treatment to maintain that control. Whether or not you need maintenance on a 1, 2 or 3 month basis highly depends on the condition of your home both sanitation and structurally. As food and clutter become more available the rate of population growth increases.

1. German or "kitchen" roaches can most often be eliminated fully when you are not in a home sharing a wall with a neighbor that is the source of the problem. When the neighbor is the source of the infestation, ongoing prevention becomes more necessary as the infestation never gets addressed at the source - but that doesn't mean you have to see them on your side.
2. American or "flying" roaches typically show up in basements and then can make their way upstairs through opening in walls and floors. These are more likely to be eliminated or more completely controlled long term after an adequate amount of treatment as they are less likely to be deeply embedded.
3. Oriental roaches or "waterbugs" typically enter through unused drain pipes in a basement or through foundational cracks after climbing out city sewers. They tend to be less severe when it comes to infestations but since they populate sewers there can be always be a.nearby population trying to enter your home. Regular visits from Peerless can ensure there is a consistent barrier of pesticides and baits to attack them before they enter or if they get inside.