An accident at an Encana Corp well last month is still wreaking havoc on a small area of Karnes County.

Related: Eagle Ford Well Explodes

In what the county sheriff is calling the worst environmental disaster in more than 20 years, the well blow-out displaced numerous families and left trees, fields, roads and houses covered in oil.

The clean up effort is proving costly and has included resurfacing more than half a mile of roadway of FM 792. Encana is also making a full environmental assessment of the area including bringing in veterinarians, soil testers and arborists.

Encana spokesman Doug Hock confirmed that there are five households that are still not able to return home and another couple of unoccupied homes that are not yet accessible.