Before you dig anywhere in California, state law requires you to notify the underground utility notification system by dialing 811 at least two working days ahead of breaking ground. The Dig Safe rules in California apply to everyone who moves earth, from utility crews to homeowners setting a fence post, and the penalties for skipping the call reach $100,000 per violation on top of full liability for any damage you cause.
Who Has to Call 811
The notification requirement reaches every person or entity that moves earth with their own employees or equipment. General contractors, subcontractors, utility companies, public agencies, and homeowners in their own yards are all covered. There is no small-project exemption. Installing a mailbox triggers the same legal duty as trenching for a commercial foundation.
California defines “excavation” broadly: any operation that moves, removes, or displaces earth, rock, or other ground material using tools, equipment, or explosives. The statute specifically covers grading, trenching, digging, ditching, drilling, augering, tunneling, scraping, and cable or pipe plowing, with a catch-all for “any other way.”1California Legislative Information. California Government Code 4216 Planting a tree, building a deck, or putting in a fence all qualify. If you’re disturbing the ground, you need a ticket.
How to Submit the Request
Start by pre-marking your proposed dig area in white. Use spray chalk or water-based paint on paved surfaces, and white flags or stakes on unpaved ground. These markings show the locators exactly where you plan to work.2DigAlert. DigAlert – Utility Locating California
Then contact your regional notification center by dialing 811 or filing through its online portal. California has two centers: USA North 811 for Northern California and parts of Nevada, and DigAlert for Southern California. The service is free.3USA North 811. USA North 811 Homepage Give the exact location — address, cross streets, or coordinates — and describe the work. The center issues a ticket and notifies every utility operator with infrastructure in the area.
Timing is strict. Submit at least two working days before your planned start, and no more than 14 calendar days in advance. The day you file does not count toward the two-day minimum.4California Legislative Information. California Government Code 4216.2
What Happens During the Waiting Period
You cannot legally start digging until two full working days have passed. During that window, every utility operator with subsurface installations in the area must do one of three things: mark the location of their lines, tell you they have no facilities in your dig area, or provide whatever location information they have.5California Legislative Information. California Government Code 4216.3 Only qualified locators may do this work.
Operators mark facilities using the American Public Works Association’s uniform color code:6American Public Works Association. APWA Uniform Color Code
- Red: electric power lines, cables, and conduit
- Yellow: gas, oil, steam, and petroleum lines
- Orange: communication, alarm, or signal lines
- Blue: potable water
- Green: sewers and drain lines
- Purple: reclaimed water, irrigation, and slurry lines
- Pink: temporary survey markings
- White: proposed excavation (your pre-markings)
You have to maintain and protect these marks throughout the job. If they fade from weather or foot traffic, stop and request re-marking before continuing.
How Long the Ticket Lasts
An 811 ticket stays valid for 28 calendar days from issuance. If your project runs past that window and the ground marks are still clearly visible, renew online or by calling 811 before day 28.4California Legislative Information. California Government Code 4216.2
Let the ticket lapse mid-job and the rules reset. Stop digging, request a new ticket, and wait through the full two-working-day response period again before resuming.
Digging Safely Around Marked Lines
The tolerance zone is the area within 24 inches on each side of the operator’s mark. Inside that zone, you must locate the exact position of every subsurface line using hand tools before switching to any power-driven or boring equipment.1California Legislative Information. California Government Code 4216 Most residential projects will rely on hand digging.
Vacuum excavation is an alternative, but only if you declared your intent to use it when you obtained the ticket and the operator agreed. If the operator objects through its electronic positive response, hand tools are your only option. Power-operated equipment can be used to remove existing pavement within the zone, but only when no known installation runs through the pavement itself. Treat every line as active, even one you suspect is abandoned.7California Legislative Information. California Government Code 4216.4
If hand excavation can’t pinpoint a line, you can request additional records from the operator, which must be provided within one working day.
Private Lines That 811 Will Not Mark
Here is the gap that catches property owners off guard: 811 only covers utility-owned infrastructure. Lines running from the service meter to your building — electrical feeders, gas lines, private water and sewer laterals — are private, and the notification centers do not mark them. By some industry estimates, 60 to 65 percent of underground utilities on a given property are private.
Responsibility for locating those lines falls on the property owner. If you’re digging near your building’s service connections, hiring a private utility locator to sweep the area is the practical fix for what 811 leaves out.
Emergency Excavation
The two-day notice does not apply to emergencies. California defines an emergency as a sudden, unexpected event involving clear and imminent danger that demands immediate action to prevent loss of or damage to life, health, property, or essential public services — fires, floods, earthquakes, gas leaks, broken water mains.1California Legislative Information. California Government Code 4216
You can begin work without waiting, but the exemption doesn’t erase the duty to take reasonable precautions. Call 811 as soon as practicable so operators can respond. A situation that doesn’t actually meet the statutory definition will not shield you from penalties.
If You Hit a Line
Strike a gas or hazardous liquid line and cause any leak of flammable, toxic, or corrosive material, and you must call 911 immediately. The same applies to any damage to a high-priority subsurface installation. Do not try to fix it yourself.7California Legislative Information. California Government Code 4216.4 Evacuate if you smell gas or see liquid escaping, and notify the operator. Report even minor damage: a small gouge on a gas line can fail later.
Penalties for Skipping the Call
Civil penalties under Government Code 4216.6 come in three tiers:
- Negligent violation: up to $10,000 per violation
- Knowing and willful violation: up to $50,000 per violation
- Knowing and willful violation that damages a gas or hazardous liquid line with an escape of flammable, toxic, or corrosive material: up to $100,000 per violation
These apply to excavators and to utility operators that fail to meet their own obligations.8California Legislative Information. California Government Code 4216.6 The California Underground Facilities Safe Excavation Board (the Dig Safe Board) investigates strikes and can recommend penalties, while the Contractors State License Board and the Public Utilities Commission enforce against licensed contractors and regulated utilities.9Legal Information Institute. California Code of Regulations Title 19 4200 – Categories of Sanctions The Attorney General, district attorneys, and local permitting agencies can also bring civil actions.
The excavator is also liable for the full cost of repairing damaged infrastructure. A ruptured gas main or severed fiber trunk generates repair bills that dwarf the statutory fines. The statute preserves all existing civil remedies for personal injury and property damage, so an injured party can sue independently of any government enforcement.
Federal OSHA Rules on Commercial Jobs
California’s 811 system protects utilities. Federal OSHA regulations under 29 CFR 1926 Subpart P add a separate layer focused on worker safety. OSHA requires the estimated location of underground utilities to be determined before opening any excavation, and utility companies to be contacted and asked to mark their installations before work begins.10Occupational Safety and Health Administration. Specific Excavation Requirements While the excavation is open, underground installations must be protected, supported, or removed as necessary to keep workers safe.
On commercial projects, complying with 811 satisfies part of the OSHA utility-location obligation, but OSHA’s broader trench-safety standards — cave-in protection, soil classification, and protective shoring — apply independently and carry their own penalties.