Before you dig, build, or excavate anywhere on your property, you need to know exactly where underground utilities run. The 811 system is designed to prevent costly—and dangerous—utility strikes by coordinating professional locating services. Understanding how it works puts you in control of your project timeline and keeps everyone safe.
What Is 811 and Why It Matters
811 is a nationwide free utility locating service that connects excavators (that's you, if you're digging) with utility companies operating in your area. When you call or submit an online request, the 811 center dispatches professional locators who mark the precise location of gas lines, electric cables, water pipes, and telecommunications infrastructure on your property using paint or flags.
Calling 811 before digging isn't just smart—it's the law in most states. Hitting a gas line can trigger an explosion; striking electrical lines risks electrocution and fire. Beyond safety, utility strikes cost you money: repair bills typically range from $5,000 to $50,000 depending on the utility damaged.
Step 1: Submit Your Locate Request
Start by calling 811 directly or visiting your state's 811 center website to submit a request online. You'll need to provide:
- Your name, phone number, and property address
- A description of your planned work (digging, boring, trenching, etc.)
- The location on your property where you'll be working
- The approximate depth you plan to excavate
Most 811 centers accept requests 24/7. Response times typically range from 2 to 5 business days, though some utilities offer expedited locating for an additional fee ($50–$150) if your project timeline is tight. Online submission is faster than phone calls and creates a digital record of your request.
Step 2: Receive Your Locate Ticket
Once submitted, you'll receive a locate ticket number. This is your proof that you've requested locating—keep it handy. The 811 center distributes your request to all utilities operating in your area: electric companies, gas providers, water departments, telecommunications carriers, and sometimes private utility operators.
Check your ticket details carefully. Make sure the address, work area, and scope of work are accurate. Incorrect information can lead to missed markings or locate crews arriving at the wrong location.
Step 3: Utilities Mark Their Lines
Each utility company sends a locator to your property to physically mark where their underground infrastructure runs. They typically use:
- Paint or chalk (white, yellow, red, blue, green, or orange) to draw lines on the ground
- Flags placed at key points
- Color codes standardized nationwide (for example: yellow = gas, red = electric, blue = water)
The locating crew may need access to your yard and sometimes to areas in the street or sidewalk. Mark-out typically takes 1–3 hours depending on the complexity of underground systems in your area and property size. Multiple crews may visit at different times since each utility schedules independently.
Step 4: Verify All Markings Before You Dig
Once markings appear, don't start work immediately. Walk the marked lines to ensure they match your planned work area. If you're planning trenching that extends beyond the marked lines, or if you notice any unclear markings, call 811 again to request a re-mark or clarification.
The markings are valid for roughly 30 days (vary by state), so time your locate request close to your actual work start date. If 30 days pass without digging, request a fresh locate.
Step 5: Call 811 Again If Circumstances Change
If your work scope changes—you decide to dig deeper, wider, or in a different location—submit a new 811 request. Don't assume old markings cover the new area.
What You Pay (Or Don't)
The 811 locate request itself is free. Utility companies are required to absorb the cost as part of their service obligation. However, some utilities charge expedited fees ($25–$150) for same-day or next-day locating if you need faster turnaround.
If you hire a professional locating contractor outside the 811 system (for private utilities, complex residential projects, or re-marks), expect to pay $150–$500 per visit depending on your region and property size. On Mercoly, you can compare and find trusted utility locating providers in your area to get transparent pricing upfront.
Frequently Asked Questions
Q: What happens if a utility line isn't marked? Some private utilities (irrigation, septic, propane tanks) aren't connected to the 811 system, so request separate locating from those service providers or hire a private locator experienced with your area's infrastructure.
Q: Can I hand-dig without an 811 mark-out? Technically you can hand-dig cautiously with proper clearance, but 811 marks give you legal protection and peace of mind—always call first.
Q: Do I need 811 locating for small projects like planting trees or installing a mailbox? Call 811 for any project where you'll break ground more than 12 inches deep; shallow work is lower risk, but marking is still recommended to be certain.
Ready to dig safely? Call 811 before you break ground, or use Mercoly to find professional locating services in your area if you need additional expertise.