Since 1984, D.F. Clark, Inc. has strived to provide quality service and integrity to our customers. Starting as an excavation contractor, D.F. Clark has grown into a Full Service Septic System Company offering all aspects of service in the wastewater industry. D.F. Clark, Inc. offers the following services: Title V Inspections Septic System Installations maintenance of On-site wastewater technology Septic Repair replacement of Individual Components Site Development.