Overview
Excavation and digging around homes, streets, and job sites commonly encounters buried utilities such as gas, steam, electricity, telecommunications, and fuel lines. When those lines are damaged the result can be injury, service interruptions, regulatory fines, and very large financial losses for contractors and property owners.
Many states require that excavators use the national 811 "Call Before You Dig" one-call system so utilities can mark underground facilities before work begins. Markouts reduce risk but do not eliminate the need for careful planning, proper procedures, and appropriate insurance or bonds.
Key takeaways
- Always contact the one-call system before any excavation, even for small or familiar projects.
- Marked utilities are only as reliable as records and recent inspections; treat shallow digs with caution.
- Standard insurance often excludes certain pollution or underground utility damage exposures, so review coverages carefully.
How it works
Before digging, the excavator notifies the local one-call center and requests a markout for the planned work area. Utility owners respond with colored markings that indicate the type and approximate location of buried facilities.
Response times and marking methods vary by jurisdiction and utility owner. For programs and insurance issues related to coordinated marking and notification systems, see Insurance for One-Call Systems for more on managing the operational and liability aspects.
What it may cover (and what it may not)
Depending on the policy, contractors insurance can cover third-party property damage, bodily injury, and legal defense costs tied to an accidental strike. Separate or specialized policies may be needed for pollution cleanup or contamination caused by a punctured fuel or oil line.
Not all policies respond to underground incidents or pollution claims, and exclusions often apply for professional errors, deliberate damage, or failure to follow one-call procedures. For a focused look at utility and pollution exposures on construction sites, consult Underground Utility and Pollution Risks in Construction.
Common mistakes to avoid
- Assuming a buried line is where records indicate without verifying marks on site.
- Using temporary wooden stakes instead of white paint or other visible markings for the dig area.
- Failing to notify the one-call center for every independent excavation activity, including small or routine digs.
- Relying on general liability coverage without confirming pollution, underground utility, or bond requirements.
Questions to ask an agent
What coverages apply if an excavation damages a utility line and causes a pollution event or business interruption? Request clear explanations of limits, exclusions, and required endorsements.
Do I need a performance or excavation bond in addition to liability coverage for grading and trenching work? For specifics about bonds and coverage for grading projects, review Excavation and Grading Bond Insurance.
Ask your agent about incident reporting expectations and whether failing to use one-call services affects coverage eligibility.
Next steps
Before you break ground, document the planned work area, notify the one-call center, and confirm marks on site. Keep clear records of contacts and markings in case a claim arises later.
Review your contract wording to allocate responsibility for locating and protecting existing utilities, and verify insurance inclusions and exclusions with your agent.
If you want a formal review of coverages or a quote for appropriate policies and bonds, talk to an agent who understands excavation and underground utility risks.
Frequently Asked Questions
Do I always have to call the one-call center before digging?
Yes; most states require notification before excavation, and calling helps reduce the risk of striking buried utilities.
Will a utility owner’s mark eliminate all risk of damage?
No; markings are approximate and based on records—careful digging practices and verification are still necessary.
If a strike causes pollution, will my general liability policy cover cleanup?
Not always; pollution and environmental cleanup often require specific coverage or endorsements, so check policy terms.
What should I do immediately after a utility strike?
Secure the area, call emergency services if needed, notify the utility owner and one-call center, and document the incident for claims and regulators.