California Government Code 4216: 811 Tickets, Tolerance Zone, Penalties

California Government Code Section 4216, the state’s “Call Before You Dig” law, requires anyone planning to disturb earth in California to mark the dig area in white, notify underground utility operators through the 811 regional notification center at least two working days before starting, and wait for every operator to locate and mark its lines before breaking ground. The rule covers contractors, public agencies, and homeowners equally, and the penalties for ignoring it reach $100,000 per incident when a gas or hazardous liquid line is damaged.

Who the Law Applies To

The statute defines “excavator” broadly. Any person, company, contractor, public agency, or other entity that uses its own employees or equipment to move earth falls within it.¹ A homeowner renting a trencher for a sprinkler line is an excavator. So is a highway contractor boring for conduit. If you’re moving earth with tools or equipment, the law reaches you.

“Excavation” itself covers grading, trenching, drilling, augering, tunneling, cable plowing, and any similar method of displacing earth, rock, or ground material. A property owner whose underground lines serve only their own property and stay under their control is not treated as an “operator” for notification center membership purposes, but that same owner is still an excavator the moment they start digging.¹

Mark the Area in White First

Before you contact 811, you have to delineate the planned excavation. That means marking the path or boundary in white using paint, chalk, flags, stakes, or a combination.² The markings must be clearly visible and cannot be mistaken for traffic or pedestrian controls. If white paint would create that confusion near a crosswalk, for example, use flags or stakes instead and tell the notification center you’ve done so.¹

Call 811 and Get a Ticket

Once the area is marked, contact the regional notification center. Across most of California that’s DigAlert, reached by dialing 811, calling 800-422-4133, or filing online through the DigAlert Direct portal.³ Your notification must come in at least two working days before your planned start, not counting the day you call, and no more than 14 calendar days ahead of it.² The center issues a ticket number and notifies every utility operator with lines in your work area.

A standard ticket is good for 28 days. If work runs longer, renew before the end of the 28th day, either online or by phone. Miss the renewal and you must stop digging, file a fresh ticket, and wait again for every operator to respond before resuming.⁴

What the Utility Operators Have to Do

Each operator on your ticket must respond before the legal start date. Their main job is to locate and field mark their underground lines within the area you delineated. Where several lines of the same type run together, they mark how many. If an operator has no lines in the area, it simply says so. The person doing the locate must be qualified and use at least a single-frequency utility locating device.⁵

Marks follow the APWA Uniform Color Code, which the statute makes mandatory:

Red for electric power lines and lighting cables
Yellow for gas, oil, steam, or petroleum
Orange for communication and signal lines
Blue for potable water
Green for sewer and drain
Purple for reclaimed water and irrigation

Known abandoned lines get a circled “A” so you know inactive infrastructure may still be present.⁵

Every operator also has to submit an electronic positive response through the notification center before your legal start date.⁵ The response tells you the area is clear, the lines are marked, the site couldn’t be marked because of access or missing delineation, or the operator needs to coordinate with you directly. You cannot begin digging until every operator on the ticket has fulfilled its obligations through this system.⁴

If the marks fade during the job, stop digging in that area, refresh your own white delineation if needed, and request remarks. The operator then has two working days to remark.⁵

The Tolerance Zone and Hand-Digging

The colored marks create a “tolerance zone” where careless digging is most likely to cause damage. The statute sets that zone at 24 inches on each side of a field marking.¹ A single centerline paint stripe creates a 48-inch-wide zone. For larger utilities marked on both outside edges, the zone extends 24 inches past each edge.

Inside the tolerance zone, you must find the exact location of the line by hand before running any power equipment. That’s potholing: physically exposing the utility so you know where it sits. Treat every line as active, even one that looks abandoned.⁶

Two narrow exceptions exist. You can use a vacuum excavation device inside the zone if you told the notification center you would use one when you got your ticket and the operator has agreed. An operator that does not agree must note that on its electronic positive response. And power equipment can remove existing pavement if no known utility is embedded in the pavement itself.⁶

Emergency Digging

The two-working-day wait has one exception: a genuine emergency, defined as a sudden, unexpected event involving clear and imminent danger that demands immediate action to prevent harm to life, health, property, or essential public services.¹ A burst water main flooding a neighborhood qualifies. A project deadline does not. Even in an emergency, contact the notification center as soon as possible; the waiting period is waived, but the duty to exercise reasonable care around underground utilities is not.

If You Hit a Line

Damage a gas or hazardous liquid line, or any “high priority” subsurface installation, and see flammable, toxic, or corrosive material escaping? Call 911 immediately. Then contact the utility operator; the notification center will give you the operator’s contact information if you don’t have it.⁶

The reporting duty is broader than catastrophic strikes. You have to notify the operator immediately upon discovering any damage to underground infrastructure, including nicks, dents, gouges, and scratches to coatings or cathodic protection systems.⁶ Within 48 hours of discovering or causing damage, you also have to notify the regional notification center. A minor nick that goes unreported can develop into a slow failure that gets traced back to your job site months later.

Penalties

Civil penalties under Government Code 4216.6 apply to both excavators and operators, and they escalate with the violator’s culpability:

Up to $10,000 per violation for a negligent violation⁷
Up to $50,000 per violation for a knowing and willful violation⁷
Up to $100,000 per violation for a knowing and willful violation that damages a gas or hazardous liquid pipeline and causes a release of flammable, toxic, or corrosive material⁷

These are per-violation figures. A project that fails to notify, then ignores the tolerance zone, then skips damage reporting can stack multiple fines. On top of the administrative penalties, the excavator is on the hook for the cost of repairing the utility, lost revenue from any service interruption, and any personal injury claims. The California Underground Facilities Safe Excavation Board, created by the Dig Safe Act of 2016, investigates accidents and enforces the statute.⁸

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California Legislative Information. California Code GOV 4216
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California Legislative Information. California Code Government Code 4216.2
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DigAlert. Contact Us
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California Legislative Information. California Code GOV 4216.2
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California Legislative Information. California Code Government Code 4216.3
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California Legislative Information. California Code GOV 4216.4
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California Legislative Information. California Code Government Code 4216.6
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California Energy Safety. Underground Infrastructure Directorate