Market Hardware, Smarter Websites & SEO for Septic System Contractors. The Yext script you entered is empty or incorrect: . How to Obtain a Site Evaluation, Septic Permit and a Licensed System Contractor A Quick Guide Through the Three-Step Process Obtaining an on-site wastewater treatment and disposal system (OWTDS) in Delaware is a three-step process. Name: Mailing Address: All information and costs are found on this form. General Assembly