Hitting the shovel into unmarked ground is how burst gas lines, severed electrical cables, and destroyed fiber networks happen—often at a cost of thousands in repairs and potential safety hazards. Calling 811 before you dig is your legal requirement in most U.S. states and the fastest way to know what's underground. Here's what you need to know about when, why, and how to use professional utility locating services.
Why 811 Locating Matters Before Any Digging Project
One call to 811 connects you to a one-call center that notifies all utility companies operating in your area. Within 2–5 business days, trained locators arrive and mark the approximate location of buried utilities—water, sewer, gas, electric, and telecommunications. This service is typically free or low-cost (around $0–$50 depending on your state), but skipping it can cost you tens of thousands in repair bills, legal liability, or worse.
The law varies by state, but most require 811 notification before digging for any project—even small fence installations or tree planting. Ignoring the requirement opens you to fines, lawsuits from utility companies, and criminal charges in some jurisdictions if someone is injured.
When You Legally Need to Call 811
You must call 811 before digging if you're:
- Installing a fence, deck, or pergola
- Planting trees or shrubs
- Digging a pool, pond, or drainage system
- Installing a driveway, patio, or hardscape
- Boring or trenching for any purpose
- Running a gas grill line or sprinkler system
- Excavating for a foundation or addition
Even small projects count. Utility locating is the non-negotiable first step before breaking ground.
How to Request Utility Locating Services
Call 811 or use an online ticket system. Most states have a centralized 811 number; some regions maintain separate one-call centers. You can also submit a locate request online through your state's one-call center website.
Provide accurate information. Be specific about your project location, the type of work you're doing, and the size of the area. Give a street address, GPS coordinates if available, and describe the scope clearly.
Mark your area. Use white paint or flags to outline the zone where you'll be digging so locators know exactly where to mark utilities.
Wait for markings. Within the prescribed timeframe (typically 2–5 business days, sometimes sooner for rush requests), locators will arrive and paint or flag the lines. Gas is usually marked in yellow, electric in red, water in blue, sewer in green, and telecom in orange.
Verify markings before you dig. Call 811 again if markings seem unclear or incomplete, or if they don't match your expectations for the project scope.
Choosing a Professional Locating Service
If you're hiring a contractor, they should handle the 811 call as part of their scope. If you're managing the project yourself, you can request locating through 811. For specialized or complex projects—like industrial excavation or high-voltage line locations—you may want to hire a private locating company for a second opinion or supplementary service.
When comparing locating service providers, look for:
- Licensing and insurance (especially if hiring a private locator)
- Turnaround time (some offer same-day or rush services for $50–$200)
- Coverage area (confirm they serve your specific zip code)
- Online platforms (convenient ticket submission and tracking)
- Track record with your contractor or past customers
Mercoly helps you compare trusted utility locating and 811 service providers in your area, making it easier to verify credentials and response times before hiring.
Cost and Timeline Expectations
Through 811, the service is free or under $50 in most states. Private locating companies charge $100–$500+ per locate, depending on complexity, acreage, and urgency. Rush services can double the cost but guarantee same-day or next-day marking.
Plan for a standard 2–5 business day wait. If your project deadline is tighter, ask about expedited options when you submit your request.
Frequently Asked Questions
Q: What happens if a locator misses a utility and I hit it during digging? You're still liable—811's role is to notify utilities, not guarantee zero risk. Always hand-dig cautiously around marked lines and call a private locator for confirmation if you're unsure.
Q: Can I dig before the full 5 days if nothing shows up? No. All utilities must have a reasonable opportunity to respond. Digging early violates state law and voids liability protection.
Q: Do I need to call 811 for every small project, or just major excavation? Yes—even small projects like planting a tree or installing a mailbox post require notification. The cost is minimal; the risk of hitting a line is the same regardless of project size.
Ready to locate utilities safely? Find certified locating services and 811 providers near you today.