California Hydrovac & Excavation Regulations
Excavation law, 811 notice rules, tolerance zone and penalties for California, with citations to the statutes and the one-call center.
Last reviewed October 18, 2026. General information only, not legal advice. Laws change and vary by locality and utility, so always contact 811 and confirm current requirements before you dig. Read the disclaimer
California at a Glance
Call 811 before you dig
- One-call center
- USA North 811Northern and Central CaliforniaVisit website for USA North 811 (opens in a new tab)
- Phone
- 811
- Also serving
- DigAlert (Underground Service Alert of Southern California), Southern CaliforniaWebsite for DigAlert (Underground Service Alert of Southern California) (opens in a new tab)
- Notice required
- At least 2 working days (not counting the date of notification) and no more than 14 calendar days before excavating
- Tolerance zone
- 24 inches
- Ticket life
- 28 days from the date of issuance
- Maximum penalty
- $100,000 (knowing and willful violation that damages a gas or hazardous liquid pipeline)
California excavators must contact a regional notification center at least 2 working days, and not more than 14 calendar days, before digging. USA North 811 serves Northern and Central California, and DigAlert (Underground Service Alert of Southern California) serves Southern California. The law is Government Code 4216 to 4216.24.
Inside the tolerance zone, excavators must find the exact location of installations with hand tools before using power equipment. Section 4216.4 allows a vacuum excavation device to expose installations in the tolerance zone under the conditions it sets.
Tolerance Zone
24 inches
The tolerance zone is 24 inches on each side of the operator's field marking (Gov. Code 4216). Excavators must determine the exact location of installations with hand tools before using power equipment (4216.4).
Key Regulations
Government Code Section 4216
Primary excavation safety law covering notification, the tolerance zone and marking standards.
Citation: Cal. Gov. Code 4216-4216.24
Dig Safe Board
Senate Bill 661 created the California Underground Facilities Safe Excavation Board ("Dig Safe Board"), which enforces the excavation law starting July 1, 2020.
Citation: Cal. Gov. Code 4216(b), 4216.6
Vacuum Excavation in the Tolerance Zone
Within the tolerance zone, excavators must find the exact location with hand tools before using power equipment. A vacuum excavation device may be used to expose installations in the tolerance zone under the conditions in 4216.4 (notice to the regional center and operator agreement).
Citation: Cal. Gov. Code 4216.4
Penalties for Violations
The California Underground Facilities Safe Excavation Board (the "Dig Safe Board") enforces the law and can impose civil penalties.
Maximum penalty: $100,000 (knowing and willful violation that damages a gas or hazardous liquid pipeline)
- Civil penalty up to $10,000 (negligent) or $50,000 (knowing and willful); up to $100,000 for knowing and willful damage to a gas or hazardous liquid pipeline
- Damage must be reported immediately to the operator, to 911 for gas or hazardous liquid escapes or high-priority damage, and to the regional notification center within 48 hours
Licensing and Permits to Confirm
Licensing depends on the type of work and the city or county. Treat these as items to check with the California licensing board and your local permit office before bidding work.
- California State Contractors License Board (CSLB) license with the appropriate classification
- City and county business licenses where required
- CSLB requires liability insurance only for LLC licensees ($1M to $5M depending on personnel); workers' compensation is required for contractors with employees
Sources
Last reviewed October 18, 2026. Facts on this page were checked against these statutes, rules and one-call center pages.
- Cal. Gov. Code 4216 (definitions) (opens in a new tab)
- Cal. Gov. Code 4216.2 (notice and ticket life) (opens in a new tab)
- Cal. Gov. Code 4216.4 (tolerance zone and vacuum excavation) (opens in a new tab)
- Cal. Gov. Code 4216.6 (penalties) (opens in a new tab)
- DigAlert (Southern California) (opens in a new tab)
- CSLB: LLC insurance requirements (opens in a new tab)
Disclaimer
This guide is general information about state excavation and one-call (811) laws. It is not legal advice, and reading it does not create an attorney-client relationship.
Laws, rules and one-call center procedures change, and requirements can differ by city, county, utility operator and type of work. Facility operators may also set their own requirements. Before any excavation, contact the state one-call center through 811 and confirm current requirements in the statute and rules cited on this site. For questions about your obligations or liability, consult the statute directly or a licensed attorney in the state where the work takes place.
Hydrovac News makes no warranty that this information is complete, current or accurate, and is not liable for any loss or damage resulting from reliance on it.
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