Reporting Sinkholes

What causes sinkholes?

Sinkholes form when groundwater dissolves rocks in the ground creating a void. In our District, while this is possible, the more common issues are related to infiltration of the underground pipes. An example would be cracks in the storm and sewer pipes. When it rains, it washes out dirt into the pipes creating a void. The other issue we see is the natural settling of dirt and soil above pipes. When pipes are replaced or repaired, you cannot compact the soil because it would potentially crack the pipes. Over time, the ground will sink while it compacts itself. The solution that issue is backfilling more dirt into the depression. Whatever the issue, a dye test can be conducted by MOC to determine the exact issue and make the appropriate repairs.