California Government Code 4216: Notice, Marking, and Penalties

California Government Code 4216 is the state’s call-before-you-dig law. It requires anyone planning to excavate to notify the regional notification center by calling 811 at least two working days before breaking ground, so utility operators can locate and mark their buried lines. The statute sets out who must call, how the dig area gets marked, how close you can get to a marked line with power equipment, what to do if you hit something, and how much a violation costs. Penalties run up to $100,000 per violation in the worst cases.¹

Who Has to Follow the Law

The statute defines “excavator” broadly: any person, contractor, subcontractor, corporation, public agency, or other entity that digs using its own employees or equipment. An “operator” is anyone who owns, operates, or maintains a subsurface installation.² Both sides carry independent duties, and both can be penalized.

Two homeowner situations sit outside the law. A homeowner who hires a licensed contractor for work on their own property that does not require a government-issued permit is not personally on the hook; the contractor is. A residential owner who is not a licensed contractor and who digs on their own principal residence for a home improvement project that does not require a permit is also exempt.³ The moment a permit enters the picture, the exemption is gone. Exempt or not, calling 811 is still the safer move; hitting a gas line in a backyard is dangerous whether or not the state can fine you for it.

How to Notify Before You Dig

Every non-emergency excavation begins with a call or online request to 811, which routes the notice to the appropriate regional notification center. The excavator must give this notice at least two working days before digging, and the notification date itself does not count toward those two days. The notice cannot be more than 14 calendar days ahead of the planned start. An excavator can specify a later start date within that 14-day window. Projects that qualify as “continual excavation” get a longer window of six months.¹

A dig ticket is valid for 28 days from issuance. If the job runs longer, renew the ticket by the end of the 28th day, either online through the notification center or by calling 811.¹ Missed renewals are one of the easier ways to trip a violation on a long project, so build the renewal date into the schedule. If markings fade or get disturbed while the ticket is still active, the excavator can ask the operator for a remark. The operator then has two working days, not counting the request date, to redo the marks.⁴

Marking the Dig Area

Before contacting the notification center, the excavator must delineate the planned dig area with white paint so operators know where to focus. The law directs excavators to follow the Common Ground Alliance’s Best Practices for delineation, though the statute controls where the two conflict.² If the site is not delineated, the operator can choose to hold off on marking its lines until the excavator finishes.¹

White paint is the default. Flags, stakes, whiskers, or combinations are allowed when the excavator determines that white paint could be confused with traffic or pedestrian markings on streets and highways. To use an alternative, the excavator must contact the regional notification center and let operators know.²

What Operators Must Do

Once notified, the operator has to act before the legal excavation start date. It has three options: locate and field mark its installations in the delineated area, provide the excavator with information about where its lines are to the extent that information is available, or advise the excavator that it has no installations there. Locating must be done by a qualified person using at least a single-frequency locating device, with access to alternative verification sources.⁴

Field markings follow the American Public Works Association’s uniform color code: red for electric, yellow for gas, blue for water, and so on.² Where multiple installations of the same type run together, the operator must indicate the number present. Abandoned installations the operator knows about get an “A” inside a circle. Operators are not required to indicate depth.⁴

The Tolerance Zone

The tolerance zone extends 24 inches on each side of the operator’s field marking.² How you measure the 24 inches depends on how the line was marked:

A single centerline marking: 24 inches on each side of the mark, which is assumed to run down the center of the installation.
A single marking with the installation’s size specified: 24 inches plus half the specified size on each side.
Width markings that show the horizontal width of the installation: 24 inches from each outside marking.

Inside the tolerance zone, excavation has to be done with hand tools or non-destructive methods such as vacuum excavation to carefully expose the utility. The statute defines a “hand tool” as any excavation tool powered entirely by human effort, not by a motor, engine, or hydraulic or pneumatic device.² This is where most damage happens, and where enforcement tends to focus after an incident.

High-Priority Installations Get an Onsite Meeting

Some buried lines are classified as “high-priority subsurface installations” because a strike would be catastrophic. The category covers high-pressure natural gas pipelines operating above 60 psig, petroleum pipelines, pressurized sewage pipelines, high-voltage electric lines at 60 kV or above, and hazardous materials pipelines.²

If your planned excavation is within 10 feet of one, the operator has to contact you and set up an onsite meeting before the legal excavation start date, or at another mutually agreed time. You discuss the excavation methods and tools you’ll use, and what information the operator will supply to help verify the exact location. Digging cannot begin until the meeting is done.¹

If You Hit a Line

Utility damage happens even on careful projects. What matters legally is what you do in the minutes after. Reporting obligations scale with severity:

Any damage at all — breaks, leaks, nicks, dents, gouges, or damage to protective coatings or cathodic protection — requires immediate notice to the operator. If you don’t have the contact, call the regional notification center to get it.
Damage to a high-priority installation requires calling 911 first, then notifying the operator right after.
If the damage releases any flammable, toxic, or corrosive substance, call 911 immediately, then contact the operator.

Beyond notifying the operator, the excavator must also report the damage to the regional notification center within 48 hours. Skipping that report is a separate violation. The only carve-out is when the excavator is also the operator of the damaged line and found the damage during routine maintenance, and no gas or hazardous liquid escaped.⁵

When the Two-Day Notice Doesn’t Apply

The two-working-day notice does not apply in a true emergency. The statute defines an emergency as a sudden, unexpected event with clear and imminent danger that demands immediate action to prevent or reduce harm to life, health, property, or essential public services. The law lists fires, floods, earthquakes, riots, accidents, damage to a subsurface installation that needs immediate repair, and sabotage as examples.²

The bar is high. Falling behind schedule or having a crew already on site does not qualify. Anyone invoking the emergency exception should be ready to document the circumstances if the Dig Safe Board reviews it later.

Penalties

The California Underground Facilities Safe Excavation Board, known as the Dig Safe Board, investigates violations and administers penalties.² Civil penalties are tiered by the violator’s state of mind and the consequences:

Negligent violation: up to $10,000 per violation.⁶
Knowing and willful violation: up to $50,000 per violation.⁷
Knowing and willful violation that damages a gas or hazardous liquid pipeline and causes a release: up to $100,000 per violation.⁷

These apply to both excavators and operators. An operator that fails to mark on time faces the same framework as an excavator who dug without calling 811. The penalties are civil rather than criminal, but on a project with multiple unmarked crossings a per-violation figure adds up fast.

Defenses If Something Goes Wrong

An excavator who did everything the statute requires has a credible defense against penalties. Proper 811 notice, delineation, respect for the tolerance zone, and hand tools or non-destructive methods near marked lines — that record shifts responsibility when the operator’s markings turn out to be inaccurate. The law is built around shared accountability, not one-sided fault.

Operators have their own defenses. Depth information is not required, so damage caused by a line being shallower than expected does not by itself establish an operator violation. And if the excavator’s delineation was inadequate or misleading, the operator’s duty to mark accurately is limited by what it had to work with.

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California Legislative Information. California Code Government Code 4216.2
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California Legislative Information. California Code Government Code 4216
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California Legislative Information. California Government Code 4216.8
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California Legislative Information. California Code Government Code 4216.3
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California Legislative Information. California Government Code 4216.4
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California Legislative Information. California Code Government Code 4216.6
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California Legislative Information. California Government Code 4216.6