Delaware · New Castle County
15 businesses hold a DNREC Class F liquid waste licence and a company address in New Castle County, from the register refreshed August 31, 2026.
7 Del. Admin. Code 7101 licenses eight separate on-site wastewater trades in Delaware, and only Class F (Liquid Waste) allows pumping out a septic tank. Class E builds systems and Class H inspects them; neither may pump one. Every business here holds Class F.
Delaware licenses the person, not the firm, so a company holds one licence per qualified employee. These businesses hold 41 Class F licences between them, and each card lists the numbers.
DNREC publishes a company address, not a county, and not a service area. The county on a card is where that address sits, worked out from Census place and ZIP data — a Class F licence is valid statewide, so a business in the next county may well serve your address.
7 businesses on this page sit in a town that spans a county line, so they appear on each county it spans; the cards say so.
These businesses are based around CLAYTON, DELAWARE CITY, MIDDLETOWN, NEW CASTLE, NEWARK, SMYRNA, WILMINGTON. DNREC publishes the licence number, company name, address and phone, and refreshes the register weekly, so the number on a card can be checked against the state's own list before you book.
Portable-toilet, plumbing and grease-trap firms hold Class F too. 5 of 15 here name septic or sanitation; the rest are flagged so you can confirm household septic tank pumping first.