811 vs Private Utility Locating in Colorado

811 is a free public utility notification system. When you call 811, utility owners are notified and required to mark their lines before excavation. It is a critical safety step and, under Colorado law, a legal requirement before any excavation. But understanding what 811 actually does, and what it does not do, is essential for anyone managing a project that involves digging.

How Colorado 811 Works

Colorado 811 is operated by the Utility Notification Center of Colorado (UNCC). When you submit a locate request either by calling 811 or through the online portal, the UNCC notifies all member utility owners whose infrastructure falls within the defined excavation area. Each utility owner is then responsible for marking their own facilities, typically within two business days (not including the day of notification).

The system covers participating facility owners: electric, natural gas, water, sewer, and telecommunications providers who have registered their service territories with UNCC. The key word is participating. If a utility owner is not a member, or if infrastructure falls outside their defined service area, it may not be marked when calling in an 811 ticket.

What 811 Covers

811 typically coordinates marking for publicly owned or utility-provider-maintained infrastructure such as:

• Electric transmission and distribution
• Natural gas mains and service lines
• Water mains (to the meter or service point)
• Sanitary sewer mains
• Telecommunications (provider dependent)
• Fiber optic lines (where the provider participates)

However, 811 does not guarantee that all utilities will be located. Privately owned lines beyond the meter are often excluded. This is not a flaw in the system, it is simply the boundary of what 811 is designed to address.

Common Misconceptions About 811

There are several misunderstandings that create risk on job sites:

• "811 locates everything." It does not. 811 only coordinates marking for member utility owners. Private lines, abandoned infrastructure, and utilities on private property past the meter are typically not included.
• "If nothing is marked, nothing is there." Absence of markings does not mean absence of utilities. It may mean the infrastructure is not traceable, the utility owner did not respond, or the line is privately owned.
• "811 provides depth information." Standard 811 markings indicate approximate horizontal position only. Depth is not typically provided through the 811 process.
• "One call covers everything on site." An 811 ticket covers the defined excavation area and the utility owners who respond. If your scope changes or expands, a new or updated ticket may be required.

When Private Locating Is Required

Private utility locating is typically needed when:

• Working beyond the public right-of-way on private property
• Investigating utilities on commercial or industrial sites
• Supporting design-phase infrastructure planning
• Verifying undocumented or incomplete records
• Locating private electric, irrigation, storm drain, or fire suppression lines
• Performing due diligence before property transactions
• Working on sites with known abandoned or legacy infrastructure

Private locating provides independent field verification and, when required, documentation suitable for engineering workflows and asset management. Unlike 811, a private locator works for you, they are accountable to the project, not to individual utility owners.

Real-World Scenarios Where Private Locating Prevents Problems

Consider a commercial tenant building out a new parking area. 811 marks the gas and electric in the right-of-way, but the site has private storm drains, irrigation lines, and underground electrical serving exterior lighting, none of which 811 will touch. Without a private locate, the excavation crew has no information about those lines.

Or take a fiber installation along a county road. The 811 markings show the major utilities, but an old water service lateral that was never properly documented runs at an unexpected angle. A private locator using electromagnetic methods and direct connection can trace that lateral and prevent a water main break that would shut down the road and cost tens of thousands in emergency repairs.

These are not edge cases. They are routine situations that happen on Colorado job sites every week.

How 811 and Private Locating Work Together

The two services are not competitors, they are complementary. The best practice for any excavation project in Colorado is:

• Always call 811 first. It is the law, and it addresses the public utility infrastructure that carries the highest consequences if struck (gas, high-voltage electric).
• Evaluate what 811 does not cover. Review the marks against your project scope and site conditions. If there are gaps (private property, undocumented lines, areas with no marks), private locating fills those gaps.
• Use private locating for depth and documentation. When your project requires depth estimates, engineered exhibits, or GIS-compatible data, those are deliverables that come from a private locating provider, not 811.

Colorado Damage Prevention Laws

Colorado's damage prevention statutes (C.R.S. 9-1.5-101 et seq.) require excavators to notify the UNCC before digging and to exercise reasonable care in the tolerance zone around marked utilities. Utility owners are required to mark their facilities within the statutory timeframe. Failure to comply, on either side, can result in liability for damages.

What the law does not do is require utility owners to locate private infrastructure they do not own. That responsibility falls on the property owner or the party performing the work. This is exactly where private locating fits into the regulatory framework: it addresses the infrastructure that the law does not require 811 to cover.

The Key Difference

811 is a notification system. Private locating is a professional service.

811 tells utility owners where you plan to dig so they can protect their assets. Private locating investigates what is actually in the ground at your specific site, using professional equipment and trained technicians who are accountable to your project scope.

What to Look for in a Private Locating Provider

Not all private locating firms are equal. When evaluating a provider in Colorado, consider:

• Equipment and methods: Do they use professional-grade electromagnetic locating equipment? Can they perform direct connections where access allows?
• Documentation: Will they provide a written report, marked-up site map, or GIS data — or just paint on the ground?
• Experience with your project type: Commercial sites, road projects, and residential renovations each have different requirements.
• Colorado-specific knowledge: Familiarity with local soil conditions, utility patterns, and the 811 process matters.
• Clear communication: A good locator will tell you what they found, what they could not find, and what limitations apply, not just mark and leave.

If you are unsure whether your project needs a private locator, contacting a qualified firm for a brief consultation can prevent delays, damage, and liability. Most experienced providers can tell you quickly whether their services apply to your situation.