Trinity Subsurface is headquartered in Wilmington, at 335 Water Street, and locates private underground utilities across New Castle County and the rest of Delaware. Our technicians use EM equipment and ground penetrating radar to find the lines Miss Utility of Delmarva does not mark, then deliver a field sketch within 24 hours.

Delaware law requires a call to 811 before digging, but the utility companies mark only their own lines, usually to the meter. Private lines are the property owner's to find: campus electric and communications, site lighting, private water and fire lines, storm and sanitary laterals, and abandoned services on redeveloped sites around Wilmington's riverfront and industrial corridors.
Our team relies on a variety of technologies and methods to fully examine your site. We use electromagnetic scanning, ground penetrating radar and more to get the best info on subsurface utilities and underground infrastructure.
Our team offers multiple services to support your projects on top of utility locating and concrete scanning. Ask us about additional utility investigation services we can offer for further support beyond GPR locating and scanning.
We aim to provide ongoing support for your current and upcoming projects. Whether you're just starting design or running into unexpected utilities during construction, we'll investigate and assist with any step of your project.



No. Utility owners mark their own facilities, usually up to the meter. Lines past that point need a private locator.
Our headquarters is in Wilmington, so we can often mobilize quickly. Most requests are on site within three business days. Call (302) 407-3697.
All of Delaware, from Wilmington, Newark and New Castle County south to Dover and Sussex County.