Trinity Subsurface locates private underground utilities for contractors, engineers and facility owners across Sussex County, from Lewes, Rehoboth Beach and Milton to Georgetown, Millsboro, Seaford and the communities around the Inland Bays. Our technicians find the electric, water, gas, storm, sewer and communication lines that Miss Utility does not mark, using electromagnetic (EM) equipment and ground penetrating radar (GPR), mark them in paint and flags, and deliver a field sketch within 24 hours.

Delaware requires excavators to call Miss Utility of Delmarva (811) before digging, but utility owners mark only their own lines, usually up to the meter or property line. Sussex County's fast resort and residential growth, poultry and agricultural processing sites, and shore communities with sandy soils and high water tables leave a lot unmarked past that point: private water and sewer laterals, irrigation, site lighting, community amenity feeds and abandoned services. They are private, and only a private locator will mark them.
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 or property line. Community water and sewer laterals, irrigation and site lighting belong to the property owner or HOA and need a private locator.
Most requests are on site within three business days, often sooner. Call (302) 407-3697 and the scheduling team will tell you what is possible.
All of Sussex County, including Georgetown, Millsboro, Lewes, Rehoboth Beach, Milton, Seaford, Laurel, Selbyville, Ocean View and Bethany Beach, plus Maryland's Eastern Shore.
Rated 4.9 out of 5 from 223 Google reviews.
“Third time working with Trinity. Expertise, determination to find the problem and solution, resulting project summaries all outstanding. Highly recommend Trinity!”
Nancy T., Google review
“Their quote was provided promptly, and the technician was punctual, professional, and well-prepared. The work was clearly explained throughout the process.”
Frank B., Google review
“Trinity Subsurface is consistent in their high level of service, responsiveness, and quality of work.”
Craig H., Google review