If there is a sinkhole in your yard, the City of Ankeny will need to determine the cause. Sometimes the cause is settling, other times it might be related to a storm sewer or sanitary sewer pipes or manhole / intake structures.
If it is determined the cause of the sinkhole is one of the public sewer systems, the City of Ankeny will repair the sewer, fill the hole, and re-seed the area. If the sinkhole is on public property but is not caused by the public sewer system, City crews will fill the hole and re-seed the area.
If the sinkhole is not caused by the public sewer system and is on private property, it is the property owner's responsibility to fill the hole.