Hitting an underground power line or gas main mid-dig isn't just a project delay — it can be fatal and carries serious legal liability. Knowing how to use a call 811 utility locating service before any excavation protects your crew, your property, and your wallet. Here's exactly what you need to know to dig safely and legally.
What Is 811 and Why It Exists
811 is the federally designated "Call Before You Dig" number in the United States. Managed by the Common Ground Alliance, it connects callers to their state's one-call notification center, which then alerts utility companies to come mark underground lines near the planned dig site.
Every state requires notification before digging — typically 2 to 3 business days in advance. Skipping this step can result in fines ranging from $1,000 to $10,000 or more, depending on the state and severity of any damage caused.
What 811 Covers (and What It Doesn't)
Public utilities — natural gas, electric, water, sewer, telecom, and cable lines — are generally covered under 811 marking services. Utility companies are legally required to send locators to spray-paint or flag their lines before your deadline.
However, 811 does not cover:
- Private utility lines (lines running from the meter to your building)
- Irrigation systems and private water lines
- Abandoned pipes and lines not tracked by active utilities
- Lines on private property not served by a public utility
This gap is where private utility locating services become essential. If you're digging near a commercial complex, agricultural property, or any site with extensive private infrastructure, you'll likely need a professional locating company in addition to 811.
Step-by-Step: How to Call Before You Dig
Step 1: Call 811 or submit online You can dial 811 directly or use your state's online portal (many states offer web-based ticket submission). Have your address, dig location description, type of work, and planned start date ready.
Step 2: Wait the required notice period Most states require 48 to 72 business hours. Don't start digging the moment you hang up — wait for all utilities to respond and mark their lines.
Step 3: Understand the color-coded markings Utility markers follow a universal color system:
- 🔴 Red – Electric power lines
- 🟡 Yellow – Gas, oil, or steam
- 🟠 Orange – Telecommunications and cable TV
- 🔵 Blue – Potable water
- 🟢 Green – Sewer and drain lines
- ⚪ White – Proposed excavation area
- 🩷 Pink – Temporary survey markings
Step 4: Dig carefully within tolerance zones Even with markings, hand-dig or use vacuum excavation within 18 inches of either side of any marked line. Power tools can shift soil in ways that don't respect painted lines.
Step 5: Call again if your project changes Locate tickets expire — usually within 15 to 30 days depending on the state. If your start date shifts or your dig area expands, submit a new ticket.
When to Hire a Private Utility Locating Service
If your project involves any of the following, a private locating company is worth the investment:
- Large-scale grading or trenching projects
- Sites with known or suspected private utility networks
- Municipalities, campuses, or older properties with unmapped lines
- High-consequence environments where 811 markings alone feel insufficient
Private locators use ground-penetrating radar (GPR), electromagnetic locators, and sometimes tracer wire detection to identify lines that 811 crews won't touch. Expect to pay $300 to $1,200+ for a professional private locate, depending on site size and method complexity.
Choosing the Right Provider
Not all locating companies are equal. When evaluating providers, look for:
- Certifications from the National Utility Locating Contractors Association (NULCA)
- Experience with your specific project type (residential vs. commercial vs. municipal)
- Clear documentation and as-built reports provided after the locate
- Liability coverage and insurance certificates
- Transparent per-visit or hourly pricing with no hidden call-out fees
Mercoly makes it easy to compare and find trusted utility locating and 811 service providers in one place, so you're not hunting through disconnected directories or relying on outdated referrals.
Common Mistakes to Avoid
- Assuming 811 covers everything — it doesn't; private lines are your responsibility
- Digging before all utilities have responded — even partial responses aren't clearance
- Letting a ticket expire — always recheck validity before breaking ground
- Ignoring marks because they seem "far away" — tolerance zones exist for a reason
- Not documenting — photograph all markings before digging in case of disputes
Whether you're installing a fence post or managing a major excavation, taking 20 minutes to use a call 811 utility locating service and hire the right professionals can save lives and prevent six-figure damage claims.
Start comparing qualified utility locating providers today and dig with confidence.