Before you break ground on any excavation project, verifying that your contractor has marked and located underground utilities isn't optional—it's a legal and safety requirement that prevents catastrophic damage and injury. Many contractors rush this step, yet a single hit to a gas line or electrical conduit can cost tens of thousands in repairs and shut down your entire worksite. Knowing how to verify proper utility location ensures your project stays on schedule and within budget.
Why Underground Utility Location Matters
Unmarked utilities are the leading cause of construction accidents. When excavators strike buried cables, pipes, or conduits, the consequences range from minor property damage to fatalities. Beyond the safety angle, hitting utilities triggers expensive emergency repairs, project delays, fines, and potential litigation. Your excavation contractor should treat utility location as a non-negotiable first step, not an afterthought.
What Utilities Need to Be Located
Before any digging begins, your contractor must identify and mark all subsurface infrastructure on your property. This includes:
- Electrical lines and conduits (primary and secondary service)
- Natural gas lines (often the most hazardous)
- Water and sewer mains
- Telecommunications cables (fiber and copper)
- Irrigation systems (common in residential and landscaping projects)
- Storm drains and French drains
- Propane lines (if applicable)
Each utility type requires different marking colors and verification methods. Your contractor should know these standards and enforce them.
How to Verify Proper Location Procedures
Ask your excavation contractor directly what their utility location process looks like. A legitimate contractor will have a documented procedure and won't hesitate to explain it. Here's what you should confirm:
Call 811 or your regional utility locating service. This free service (in the US) sends a technician to physically mark buried utilities with paint or flags. Confirm your contractor has called 811 at least 2–3 business days before excavation begins. Request written confirmation that the call was logged.
Require on-site utility marking before any equipment moves. Painted lines or flags should clearly mark all utilities. Your contractor should photograph or document these markings. If the contractor skips visible marking or proceeds without it, stop the work immediately.
Ask for a locate ticket number. The 811 system issues a ticket number for every request. This number tracks the service call and proves that utilities were marked. Your excavation contractor should provide you with this ticket for your records.
Verify contractor training on utility awareness. Operators of excavation equipment should be trained to recognize utility markings and understand the risks. Ask if operators have completed OSHA-recognized utility awareness training or equivalent certification.
Red Flags in Contractor Behavior
If your excavation contractor exhibits any of these behaviors, reconsider hiring them:
- Dismisses utility location as unnecessary for small projects (utilities don't recognize project size)
- Doesn't know the 811 process or admits they rarely use it
- Can't explain what utilities are present on your property or in your area
- Refuses to wait for marking and wants to "get started right away"
- Has no record of previous utility locate tickets from past projects
- Quotes significantly below market rates and seems to cut corners on safety steps
Typical Costs and Timeline Impacts
Utility location adds minimal cost to most excavation projects—typically $200–$800 depending on property size and complexity. The 811 service itself is free, though private utility locating companies may charge $300–$1,500 if extra precision is needed (e.g., near critical infrastructure). Budget 3–5 business days for the locate process. Rushing this step to save a few days often costs far more in delays and emergency repairs later.
What You Should Require in Writing
Before work begins, your contract should specify:
- That utility location is a prerequisite to excavation
- The contractor's responsibility to call 811 and document the service
- That work stops immediately if utilities are suspected but not marked
- Your right to inspect marked utilities before equipment arrives
- That the contractor assumes liability for any utility strikes caused by failure to locate
Finding Verified Contractors
When comparing excavation contractors, Mercoly makes it easy to find and vet trusted providers in your area. You can review contractor credentials, past project details, and customer feedback—all in one place—to ensure you're hiring someone who takes utility safety seriously.
Frequently Asked Questions
Q: Is calling 811 the contractor's job or mine? Most contracts place responsibility on the contractor, but as the property owner, you're legally liable if utilities are damaged. Clarify in writing who will make the call, then verify it was actually made.
Q: Can I proceed with excavation if 811 says no utilities are in the area? Yes, but only if the locate ticket confirms the search was completed and marked "no utilities found." Don't assume—always wait for documented confirmation.
Q: What happens if the contractor hits a utility despite proper marking? If utilities were correctly marked and the contractor hit one anyway, the contractor's insurance typically covers the damage, and they may face regulatory fines. If utilities weren't marked, liability depends on your contract and local law.
Start your search for certified, safety-conscious excavation contractors today on Mercoly to compare verified providers and protect your project.