Precision works flats, rowhouses, and small commercial buildings across San Francisco, from the dense blocks near the Mission to streets that back right up against Glen Canyon Park and Mount Sutro's eucalyptus forest. Green space here is close and steep rather than spread out, and that changes what moves into a building from the edges. We look at what borders a property as closely as the property itself.


Rodents move freely between the wooded slopes of Mount Sutro, Glen Canyon Park, and McLaren Park and the buildings that border them, especially in dense rowhouse blocks where one shared wall can carry an infestation down an entire street. Roaches and flies concentrate around food service and multi-unit housing citywide, while ants and earwigs push in from garden beds and ivy along canyon edges after the fog rolls in and keeps everything damp. Millipedes turn up in basements and garden-level units near Golden Gate Park and the Presidio's wooded stretches, and mosquitoes breed in the still water that collects near Lake Merced.
San Francisco does not have farmland or open desert at its edges the way a lot of cities do, but it has something almost as effective at pushing wildlife and insects into buildings, steep, wooded open space that sits inside the city limits rather than outside them. Mount Sutro's eucalyptus forest, Glen Canyon Park, and McLaren Park all border residential blocks directly, with no buffer of yards or fencing in between in a lot of spots. Rodents especially treat that edge as one continuous territory, moving from the tree cover into a building's crawl space, wall void, or shared basement without much of a gap to cross.
The city's fog and cool, damp air do the rest of the work. Even in summer, when San Francisco stays cooler than almost anywhere else in California, the persistent moisture along the western neighborhoods near Ocean Beach and Lake Merced keeps millipedes, earwigs, and ants active later into the year than in a drier climate. Because so much of the city is rowhouses and multi-unit buildings sharing walls and plumbing chases, we treat the building as a whole rather than one unit at a time whenever the source looks like it is coming from a shared wall or the green space next door, since a single unit's treatment does not hold if the pressure is coming from outside the building.


See at Pest World!


See at Pest World!