Before you dig, build, or excavate anywhere on your property, calling 811 is non-negotiable—it's how utility companies mark underground lines so you don't hit gas, water, electric, or fiber cables. Getting it right takes just a few minutes and could save you thousands in damage costs and potential safety hazards. Here's exactly what to do.
Why You Must Call 811 Before Any Digging
Striking an underground utility line isn't just expensive—it's dangerous. Hitting a natural gas line can cause explosions, electrical lines can electrocute, and water/sewer breaks create environmental hazards. When you call 811 (or your regional equivalent), utility locators are dispatched to mark all underground infrastructure on your property with spray paint, flags, or both. Most calls are free or cost a small administrative fee ($5–$25 depending on your state), and locating work typically happens within 2–5 business days.
Step-by-Step: How to Call 811
1. Call 811 from your phone Dial 811 and choose the option for your state. Some states have regional call centers; others route to a single 811 coordinator.
2. Provide your location and project details Be ready to tell the operator:
- Your address (where the digging will happen)
- Type of work (fence post, landscaping, pool installation, foundation work, etc.)
- Approximate area and depth of digging
- Whether you're a homeowner, contractor, or excavator
3. Receive a confirmation and ticket number You'll get a ticket number and a timeframe (usually 2–5 business days). Write it down or save it in your phone—you may need it later.
4. Mark your property boundaries The call center will ask you to mark where you want utilities located. Use your own paint, chalk, or flags to outline the area, or the locators can mark it during their visit.
5. Wait for the locators to arrive and mark utilities Utility locators—whether direct employees or contracted through a private locating company—will visit your property, locate underground lines using specialized equipment (electromagnetic locators, GPR, or a combination), and mark them with spray paint and flags. Different colors indicate different utilities: red for electric, yellow for gas, blue for water, green for sewer, and orange for telecom/fiber.
What to Expect From 811 Services
Timeframe: Most states require utility location within 2–5 business days of your call. Rush services are available in some areas for an additional fee (typically $25–$50), with 24-hour turnaround.
Accuracy: Locators are trained to mark the surface location of underground lines, but depths and exact routes below grade may not be 100% precise, especially in areas with aging infrastructure or private utility lines. Always hand-dig or use caution in marked areas.
Private lines: 811 coordinates marked utilities, but not all private utility lines (like propane, irrigation, or fiber installed by private contractors) are included. Ask your property's previous owner or utility company about any private lines.
Marks fade: Paint and flags can disappear within weeks in harsh weather. Take photos or note line locations for future reference.
Common Mistakes to Avoid
- Calling too late: Don't wait until the day before your project. Call at least a week in advance to ensure timely marking.
- Incomplete information: Vague descriptions of your digging location waste locator time and can result in missed utilities.
- Ignoring marks: Respect all marked lines. If you're unsure about a mark, contact the utility company before proceeding.
- Assuming 811 covers everything: Private lines, especially on rural or older properties, won't always show up. Do your due diligence with property records and neighbors.
Finding Trusted Locating Contractors
While 811 is a free coordination service, if you need faster turnaround, more detailed documentation, or locate services beyond standard utility marking, private locating companies offer premium services. Rates typically range from $150–$400 for residential projects, depending on size and complexity. When comparing providers, look for certifications (like Certified Locator credentials), insurance, and customer reviews. Mercoly makes it easy to compare and find trusted utility locating services in your area, connecting you with vetted contractors in one place.
Frequently Asked Questions
Q: Is calling 811 really free? Yes, the initial call and standard utility location are free in all 50 states. Some states charge a small administrative fee ($5–$15), and rush services have additional costs.
Q: What if I'm a contractor—do I still call 811? Absolutely. Contractors and excavators are legally required to call 811 before any ground disturbance work; many states impose fines on contractors who dig without locating.
Q: Can I start digging immediately after marks are placed? Not quite. Once marks are placed, you should begin digging within a few days; marks can fade or become inaccurate after 2–4 weeks, so refresh them if there's a delay.
Find verified utility locating providers and compare services near you to ensure your project stays safe and on schedule.