Hello Doug and thanks for your post.
Can you please elaborate on the "hole" that is appearing in your yard. Can you tell us where it seems to appear, size and depth of the hole and what you've done to remedy the situation?
While you're doing that, let me just add that holes that appear in the soil can come from many sources, but the two most common are:
Pests - gophers and moles can dig up soil as they root through the ground for shoots and bugs. You can often tell that a pest was in your yard because you'll see dirt brought up "over" the sides of the hole, as if something come up from the ground when it exited the hole. If this is the type of hole you're seeing, then a good pest control company should be able to address the problem of the gophers or moles.
Water Leaks, Collapsed Lines or Plumbing Problems - Slow leaks can cause erosion around a water line that appears first as a very "green" patch in the lawn (if you have lawn in the area) or creates a small sink hole in the ground where the water is washing away the subsoil. Sewer lines leading away from the home can similarly rupture or break leaving a section of soil that collapses over time. If the pipe and plumbing issues are not repaired, then, even after filling in the hole, the problem will likely recur--not right away, but eventually and in the same general location. To resolve these problems, talk with your plumber who can use sound waves to find a leak and then make the necessary repairs.
In addition to pests and water leaks, depending on where you live and the soil conditions, holes in the ground can appear due to geological instability, poor compaction, underground or alluvial water, poor drainage, and even fault line movements. Most of these issues would appear in the natural hazard report that you were provided when you purchased your home. If you feel that the hole is appearing due to a geological issue, then contact a geologist for assistance and advice. Unfortunately, stabilizing soil on your property is usually the responsibility of the homeowner, so there is not--to my knowledge--a governmental oversight group that will do this for you at their cost. Get professional help to determine why earth is moving on your property and advice on how to ensure that it doesn't damage or threaten your home.
Allison James Estates