How to write a strike prevention and dig safe program for crews

Last updated 2026-07-11

What is a strike prevention and dig safe program, and who needs one?

A strike prevention program is a written document that tells everyone on your crew, before a single shovel hits the ground, exactly what steps to take to find and protect underground utilities. It covers who calls 811, how long to wait for locates, what the tolerance zone around a marked utility looks like, what hand-dig rules apply, and what to do if something goes wrong anyway.

OSHA has no standalone standard titled 'dig safe.' It relies on 29 CFR 1926.651(b), which requires employers to determine whether underground utilities exist before digging and to contact the appropriate agencies ^[1]. State dig laws stack their own requirements on top. Your written program has to stitch together three things: federal excavation rules, state one-call law, and the individual utility companies' rules.

Who needs one? Any employer whose crews dig, trench, bore, or run mechanical equipment near the ground surface. Landscapers. Plumbers. Electricians. General contractors, telecom crews, irrigation installers, highway crews. OSHA's excavation standard at 29 CFR 1926 Subpart P applies to all excavations in construction, and the General Duty Clause (Section 5(a)(1) of the OSH Act) can reach general industry employers when the hazard is recognized ^[2].

If your people dig, you need this in writing. Verbal is not a program.

What does OSHA actually require before you dig?

The core requirement lives in 29 CFR 1926.651(b)(1): "The estimated location of utility installations, such as sewer, telephone, fuel, electric, water lines, or any other underground installations that reasonably may be expected to be encountered during excavation work, shall be determined prior to opening an excavation." That sentence is the legal foundation of your program ^[1].

OSHA does not set a specific wait time or mandate a locating method, because states run their own one-call laws. What OSHA demands is a good-faith effort to identify what's underground. Dig without locating utilities you knew were there, and that's a willful violation. Willful violations carry fines up to $161,323 per violation as of 2024 ^[3].

Beyond the locate itself, 29 CFR 1926.651(b)(2) says once locations are determined, the work has to be done "in a manner so as to avoid damage to or minimize interference with utilities." That phrase is the legal hook for your tolerance zone rules, your hand-dig requirements, and your spotter policy. Write your program to hit each element by name.

OSHA also expects a competent person on every excavation site. That person has to classify soil, spot hazards, and hold authority to stop work. Put their utility-strike duties in this program, not buried in the general competent person section of your safety manual.

What is the 811 call-before-you-dig process, and how does it fit into a written program?

811 is the national one-call number. Federal law designated it (the Pipeline Safety Improvement Act of 2002 required the FCC to assign it), and state one-call centers administer it ^[4][12]. When you call or file online, the center notifies member utilities, who then have a set window, usually 2 to 3 business days depending on the state, to mark their lines at the dig site.

Your written program has to name who calls 811 on each job. On small crews that's usually the foreman. On bigger projects it might be the project manager or site superintendent. Say the call happens before any site prep that disturbs soil, more than before the main excavation.

Then there's ticket expiration. Most state tickets stay valid for 10 to 45 days. Crews should never lean on a months-old ticket for a new dig phase. Write a hard rule: if work pauses more than X days, re-notify before resuming.

Here's the gap most small business programs miss. 811 does not reach every utility. Private service laterals from the property line to a building, some municipal lines, and privately owned systems often sit outside the one-call system. Your program should require crews to ask property owners about private lines and to pull historical drawings where they exist. An 811 marking tells you where public utilities were at last record. It does not promise nothing else is buried there.

How do you define and document the tolerance zone in your program?

The tolerance zone (also called the excavation zone or hand-dig zone) is the area around a marked utility where mechanical excavation is banned and only hand tools or soft-digging equipment are allowed. Most states set it at 18 to 24 inches on each side of the mark, but you have to look up your own state's law, because it varies ^[5].

Your program should name the exact distance your state requires, name the law that governs it (your state's excavation or dig safe act), and list the approved methods for working inside the zone. Hand tools, hydro-excavation, and air-knife excavation are the usual options. Backhoes and trenchers stay out of the zone unless your state law allows otherwise and you have an engineer-of-record sign-off.

Document the tolerance zone on every dig permit. If you run a pre-dig checklist (you should), make the tolerance zone measurement a required field. That builds a record that your crew thought about the zone before the equipment moved.

A table helps crews hold the rules in their head across utility types:

Utility type	Typical tolerance zone	Special consideration
High-pressure gas	24 inches each side	Often requires utility company standby
Electric (distribution)	24 inches each side	De-energize request if work is very close
Telecommunications	18 inches each side	Can still carry current; treat as energized
Water/sewer	18 inches each side	Pressurized lines shift; confirm depth
Petroleum products	24 inches each side	Vapor hazard; no mechanical sparking

These are general ranges. Your state may be stricter, and specific utility agreements can add more on top ^[5].

What sections does a written dig safe program need to include?

Here's a practical outline. Not every business needs every sub-element, but between OSHA's excavation standard and state dig laws, most of these have to be addressed somewhere.

1. Purpose and scope. One paragraph on what the program covers and who it applies to. Nobody who touches digging work gets left out of scope.

2. Responsibilities. Name the roles: competent person, crew foreman, individual employee. Each role gets its own list of duties. 'Management is responsible for safety' does not meet OSHA's intent.

3. Pre-dig planning. The 811 notification requirement, who makes the call, the minimum wait period, and what to do when markings are unclear or missing.

4. Utility marking interpretation. Spell out the APWA Uniform Color Code (red = electric, yellow = gas, orange = communications, blue = water, green = sewer, purple = reclaimed water) ^[6]. Crews should know these by memory, but keep them in the program as a reference.

5. Tolerance zone rules. Exact distance, approved methods inside the zone, restrictions on mechanical equipment.

6. Competent person duties. Soil classification, pre-work inspection, stop-work authority.

7. Hand-digging and soft-dig procedures. Step by step: expose the utility by hand, find its depth and direction, extend the hand-dig zone as needed, then resume mechanical work outside the zone.

8. Emergency response. What to do when a utility is struck: kill ignition sources if gas, call 911, call the utility, evacuate, and stay out until the utility company clears the site. Write it out step by step. Adrenaline wrecks decision-making.

9. Incident reporting and investigation. Tie this to your overall incident report process and OSHA's recordkeeping requirements.

10. Training requirements. Who gets trained, on what, by whom, how often.

11. Program review schedule. Review annually at minimum, and after any utility strike.

If writing this from scratch feels like the project you'll keep postponing, SafetyFolio's safety program generator can produce a state-specific first draft in about 15 minutes, which you then review and sign.

How do you write the emergency response section for a utility strike?

This is the section most programs botch by keeping it too short. 'Call 911 and evacuate' is not enough. Your crew needs the sequence, because the first minute after a gas line strike or a nicked electrical cable is pure chaos.

Natural gas strike: (1) Stop all mechanical equipment, but do not switch off electric tools or vehicles, because a spark from flipping a switch can ignite pooled gas. (2) Evacuate everyone upwind and away, at least 300 feet is the conventional fire-department guideline, though real safe distance depends on conditions. (3) Call 911. (4) Call the utility's emergency line, which belongs in your program's appendix. (5) Keep everyone out until the utility company and fire department clear the scene. The smell fading does not mean it's safe.

Electrical cable strike: (1) Do not touch the equipment that made contact. Ground gradients can kill at a distance. Move away in small shuffling steps, both feet close together, because striding creates a voltage difference between your two feet. (2) Call 911. (3) Notify the utility. (4) Set a perimeter. Nobody approaches until the utility de-energizes the line. This is the same energy-control logic behind lockout-tagout: assume live until proven dead.

Water or sewer strike: (1) Stop work. (2) Stabilize the trench walls if soil saturation raises a collapse risk. (3) Notify the utility and the municipality. The emergency is slower than gas or electric, but contaminated work area and street flooding are real secondary hazards.

Utility emergency numbers go in the program appendix and on a laminated card in every crew truck. If your foreman has to hunt for the number after a strike, the program already failed.

What training do crews need, and how do you document it?

OSHA's competent person requirement for excavation (29 CFR 1926 Subpart P) means every excavation site gets inspected by someone who can identify hazardous conditions and has authority to act ^[1][11]. That person needs training. The rest of the crew needs enough to read a utility marking, know their role in the tolerance zone, and run the emergency steps.

For the competent person, training usually covers soil classification, excavation hazard recognition, utility locating basics, and emergency procedures. OSHA sets no specific hour count, but the training has to be adequate for the hazards the person will face. An osha training course built around excavation, or an osha 30 construction-track course that includes Subpart P, gives you a defensible documented foundation.

For the broader crew, document training on a sign-in sheet with the date, the trainer's name, the topics covered, and each person's signature. Keep it as long as the employee works for you, plus three years. OSHA can pull training records during an inspection and will check whether the records match the hazards your crew actually faces.

Run refresher training after any strike or near-miss, and before your crew works an area with unfamiliar utility density: dense urban underground, or older industrial sites where the historical records are junk.

How do near-misses fit into a dig safe program?

A near-miss is any event where a utility was struck or nearly struck without a serious injury or outage. The General Duty Clause turns on a 'recognized hazard.' So if your crew logs near-misses and you change nothing, a later injury carries extra enforcement weight. You knew.

Your program should define what counts as a reportable near-miss for dig work: unexpected contact with a utility even when nothing broke, discovery of an unmarked utility inside a tolerance zone, equipment traveling over a marked line without authorization. Each one triggers an internal investigation, not a verbal shrug.

The investigation doesn't need to be a long report. A one-page form asking what happened, what the contributing factors were, and what changes is plenty. The discipline is in asking, not in paperwork volume. Keep the records. Patterns in near-miss data show you where the program is thin before a fatality shows you instead.

What do the injury and fatality numbers actually look like for utility strikes?

The DIRT Report (Damage Information Reporting Tool), published by the Common Ground Alliance, is the main industry source for underground damage data. The 2022 DIRT Report found excavation damage to underground utilities happens roughly every 100 minutes in the United States ^[8]. The most common root cause is failure to notify before digging, about 30% of all damage events. Locate request errors and inadequate locate depth each add sizable shares.

Fatalities are harder to pin down. The Bureau of Labor Statistics tracks construction deaths by event category, and contact with underground utilities feeds into both electrocution deaths and gas explosion events, but BLS does not break out underground utility strikes as a standalone line ^[9]. So nobody has a clean national count of dig-strike deaths; the closest you get is inferring from the electrical and explosion categories.

The money exposure is real. The Common Ground Alliance puts the average cost of a single underground damage event, counting repair, downtime, and indirect costs, somewhere between $5,000 and $250,000 depending on the utility and location. Gas and electric strikes trend to the top of that range ^[8].

Those numbers are why OSHA treats excavation as a high-hazard operation and why 29 CFR 1926 Subpart P carries the penalty exposure it does ^[11].

How do state one-call laws interact with your federal OSHA obligations?

Every U.S. state has a one-call law that sets the notification timeline, the required locate depth, the enforcement mechanism, and the civil penalty structure for damage. These run separate from OSHA. You can break a state dig law without touching OSHA, and break OSHA without touching the state law. In practice, a real strike usually trips both ^[4].

When the two conflict, your program follows the stricter one. If your state says wait 72 hours before digging, your program says 72 hours, even though OSHA sets no specific time. If your state mandates a 24-inch tolerance zone and general practice suggests 18 inches, you write 24.

State Plan states can go stricter than federal OSHA on excavation. California's Cal/OSHA has extra requirements in its excavation safety orders. Washington and Michigan do too. If you operate in a state plan jurisdiction, check the state's own standards before you finalize the program ^[10].

The simplest way to stay current: bookmark your state's one-call center site and your state OSHA agency page. Check both when you do your annual review.

What are the most common mistakes in dig safe programs, and how do you avoid them?

Vague scope. Programs that say 'all excavation work' without naming job types, locations, and crew roles leave too much to guesswork. Be specific: name the equipment your crews run, the typical dig depths, the areas where you work.

Missing private utility language. A program that mentions only 811 skips the private lateral problem entirely. Roughly half of underground damage events involve facilities outside the one-call system. Your program should require crews to ask property owners about private lines, pull as-built drawings where they exist, and hire a private locating service for known-complex sites.

No escalation path. If a foreman finds markings unclear or absent after the waiting period, the program should tell them exactly what to do: re-call the one-call center, contact the specific utility directly, and if it's still unresolved, get written clearance from a supervisor before proceeding. 'Use your judgment' is not a program.

Training records that don't match the work. If your crews dig near high-voltage electric but your records show only a generic excavation class that never mentioned electrical hazard, an OSHA inspector will spot the gap in a minute.

No post-strike review trigger. Programs reviewed only once a year miss the point. Any utility contact, however minor, should automatically trigger a review of the relevant section. Write that in.

And the classic: the program lives in a binder at the office and never reaches the field. A digital copy on phones or a laminated one-page summary in every truck fixes it. The written program is worth nothing if the person making the call has never read it.

How do you build a pre-dig checklist that actually gets used?

A checklist works when it's short enough to use in the field and specific enough to catch the real hazards. Here's a structure that fits on one page.

Project information: date, location address, crew foreman name, job number.

811 notification: ticket number, date called, utilities notified, wait period confirmed (yes/no), markings present and visible (yes/no).

Private utility check: property owner asked about private lines (yes/no/N/A), as-built drawings reviewed (yes/no/N/A), private locate service used (yes/no/N/A).

Site conditions: ground water expected (yes/no), soil type (type A/B/C per OSHA classification), overhead lines within equipment swing radius (yes/no).

Tolerance zone: marked on site (yes/no), distance per state law recorded (XX inches), hand-dig method confirmed (hand tools/hydrovac/air knife).

Competent person designation: name, qualified signature.

Emergency information: utility emergency numbers confirmed on site (yes/no), nearest hospital (address), crew briefed on emergency procedures (yes/no).

Keep signed checklists in the job file. They're your defense when an incident happens and OSHA asks whether you did pre-dig planning. They're also a data source when you review the program: a pile of 'no' answers in one field tells you where training or process is breaking down.

If you want a pre-built version inside a full written program, the SafetyFolio generator produces a state-specific dig safe program with a pre-dig checklist template you can put in your crews' hands the same day.

Frequently asked questions

Do I legally have to have a written dig safe program, or is verbal training enough?

OSHA's 29 CFR 1926.651 requires you to determine utility locations before digging, but it does not explicitly say the procedure has to be written. Enforcement practice, though, treats written documentation as evidence of a compliant program. Without one, you have nothing showing the required steps were taken, which makes any citation much harder to contest. Write it down.

What is the APWA uniform color code for utility markings?

The American Public Works Association code runs: red for electric power, yellow for gas or petroleum, orange for communications and fiber, blue for potable water, green for sewer and drain, purple for reclaimed or irrigation water, and pink for temporary survey marks. White marks the proposed excavation area. Your crew should know these by heart, and your written program should include them as a quick reference.

How long after calling 811 do I have to wait before digging?

Wait times are set by state law, not OSHA, and usually run 48 to 72 business hours. Some states let you shorten the window in true emergencies if you notify utilities directly. Check your state's one-call center for the exact number. Your written program should state the required wait for every state where your crews work, more than your home state.

What is a tolerance zone and what can my crew do inside it?

The tolerance zone is the area within a set distance on each side of a utility mark where mechanical digging is banned. Most states set it at 18 to 24 inches. Inside the zone, crews use hand tools, hydro-excavation (potholing), or air-knife methods to expose the utility before any mechanical equipment gets closer. Your state's one-call law defines the exact distance.

What should my crew do immediately if they hit a gas line?

Stop all equipment but do not switch anything off, because sparks ignite gas. Evacuate everyone upwind and away, at least several hundred feet. Call 911. Call the gas utility's emergency line. Keep the area clear until the utility company and fire department confirm it's safe. These steps belong on a laminated card in every crew truck, more than in the binder at the office.

Does 811 cover all underground utilities, including private lines?

No. The 811 system notifies member utilities, typically public utilities and large private operators. Privately owned service laterals from the street to a building, irrigation systems, some fiber runs, and older municipal lines may sit outside the system. Your program has to require crews to ask the property owner about private lines and review any available as-built drawings before treating 811 markings as full clearance.

Who counts as a competent person for excavation under OSHA?

OSHA defines a competent person as someone able to identify existing and predictable hazards and authorized to take corrective action. For excavation that means they can classify soil type, recognize signs of cave-in and utility hazard, and hold real authority to stop work. Completing an excavation-specific course plus an OSHA 30 construction-track program gives a defensible documented basis for the designation.

How often should a dig safe written program be reviewed?

Annually at minimum. Also trigger a review after any utility strike, after a near-miss, when your crew starts working in a new state, or when your area's one-call laws change. A program that was accurate two years ago may carry outdated wait times, tolerance distances, or emergency contact numbers. Set a calendar reminder and make the annual review a documented event with a sign-off date.

What OSHA penalties apply to excavation violations involving utility strikes?

Serious violations carry penalties up to $16,131 per violation. Willful or repeated violations can reach $161,323 per violation as of 2024, and both figures adjust for inflation each year. Dig without locating utilities you knew were there, and OSHA can classify it as willful. A single strike that exposes multiple program deficiencies can produce multiple citations and stacked penalties.

Can I use the same dig safe program for general industry and construction crews?

Not without changes. OSHA's excavation standard at 29 CFR 1926 Subpart P applies to construction. General industry excavation falls under the General Duty Clause and potentially parts of 29 CFR 1910 depending on the work. The core elements of a dig safe program overlap, but the cited standards, competent person requirements, and soil rules differ. Write separate scope sections if you run both types of operation.

Do I need a dig safe program if my crews only dig occasionally?

Yes. OSHA's requirements attach to the hazard, not the frequency. A crew that digs twice a year still has to call 811, respect tolerance zones, and have a competent person present. Infrequent digging is actually higher risk, because crews are out of practice. A short, clear written program and a pre-dig checklist matter more for occasional diggers than for crews who do this daily.

What records do I need to keep related to dig safe activities?

Keep 811 ticket numbers and confirmation records for each job. Keep signed pre-dig checklists. Keep training records showing who was trained, on what, and when. Keep any incident or near-miss reports tied to utility work. No single OSHA regulation lists all of these for dig work specifically, but General Duty Clause enforcement and state one-call civil liability both depend on whether you can show you followed the required steps.

How do I handle a situation where 811 markings are absent or unclear after the waiting period?

Do not dig. Re-call the one-call center and request re-notification. Contact the specific utility directly if you know which one is missing. Document the date, time, and outcome of every contact. If clear markings still don't come, bring in a private locating service. Proceed only once you have reasonable confidence in the utility locations, and keep your escalation record in case you ever need to show OSHA or a court that you acted in good faith.

Sources

1. OSHA, 29 CFR 1926.651(b) Excavation standard, underground installations: Employers must determine the location of underground utilities prior to opening an excavation, per 29 CFR 1926.651(b)(1).
2. OSHA, OSH Act of 1970, General Duty Clause Section 5(a)(1): The General Duty Clause requires employers to provide a workplace free from recognized hazards likely to cause death or serious harm.
3. OSHA, Penalties overview and 2024 adjustments: Willful or repeated OSHA violations carry maximum penalties of $161,323 per violation as of 2024.
4. Common Ground Alliance, 811 national one-call program: 811 is the federally designated national one-call number enabling excavators to notify utilities before digging.
5. Common Ground Alliance, Best Practices for Damage Prevention: Tolerance zones vary by state law and typically range from 18 to 24 inches on each side of a marked utility.
6. American Public Works Association, Uniform Color Code for Underground Utilities: The APWA Uniform Color Code defines colors for utility marking: red (electric), yellow (gas), orange (communications), blue (water), green (sewer), purple (reclaimed water).
7. Common Ground Alliance, 2022 DIRT Report (Damage Information Reporting Tool): The 2022 DIRT Report found underground utility damage occurs roughly every 100 minutes in the U.S.; failure to notify before digging accounts for approximately 30% of all damage events.
8. Bureau of Labor Statistics, Injuries, Illnesses, and Fatalities program: BLS tracks construction fatalities by event category; contact with electrical hazards including underground systems is a leading cause of construction deaths, though underground strikes are not a separate reported category.
9. OSHA, State Plans overview: Twenty-two states and jurisdictions operate OSHA-approved State Plans that can adopt excavation rules stricter than federal OSHA standards.
10. OSHA, 29 CFR 1926 Subpart P, Excavations: 29 CFR 1926 Subpart P covers excavation safety in construction including soil classification, protective systems, and utility identification.
11. Pipeline and Hazardous Materials Safety Administration (PHMSA): The Pipeline Safety Improvement Act of 2002 required the FCC to designate 811 as the national one-call excavation notification number.