Underground Utility Strikes
29 CFR 1926.651 · This talk in Spanish
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Why it matters
Hitting a gas line or a buried power cable can cause serious injuries or even death. OSHA requires you to find where underground lines are likely to be and get the utility companies to mark them before you dig. Marks are only as good as what happens after, so NIOSH says to dig by hand within 2 feet of any mark.
Hazards
- ⚠ Striking gas lines causing leaks and explosions
- ⚠ Cutting electric cables energizing soil and equipment
- ⚠ Water main strikes flooding excavations instantly
- ⚠ Fiber and communication cuts with massive liability
- ⚠ Unmarked private lines: irrigation, septic, site lighting
Controls and safe practices
- ✓ Call 811 and wait for all utilities to respond before digging; per 1926.651(b), the location of underground installations must be determined before opening an excavation.
- ✓ Hand dig or vacuum excavate within 2 feet of any mark, or wider if your state requires it.
- ✓ Check your locate ticket dates under your state rules, and call again if the work runs past them or the marks fade.
- ✓ Assume private lines exist that 811 does not mark: irrigation, gas to grills and generators, low-voltage lighting.
- ✓ If you hit a gas line: get everyone out right away, keep people away, and call the fire department and the gas company.
- ✓ If a cable is cut, treat everything in contact with the ground as energized; keep everyone back.
What OSHA says
Exact words from the official text, with a link to each paragraph.
“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.”
“Utility companies or owners shall be contacted within established or customary local response times, advised of the proposed work, and asked to establish the location of the utility underground installations prior to the start of actual excavation.”
“When excavation operations approach the estimated location of underground installations, the exact location of the installations shall be determined by safe and acceptable means.”
“While the excavation is open, underground installations shall be protected, supported or removed as necessary to safeguard employees.”
“Plan to dig by hand when working within 2 feet of a mark-out, to make sure you do not hit a utility line or conduit with heavy equipment.”
Site check before the talk
Walk the site and tick each line. Each line comes from the text quoted above.
- ☐Find out where underground lines are likely to be before the first bucket goes in. (29 CFR 1926.651(b)(1))
- ☐The utility companies or owners were told about the work and asked to mark their lines before digging starts. (29 CFR 1926.651(b)(2))
- ☐As digging gets close to a marked line, find its exact spot by safe means. (29 CFR 1926.651(b)(3))
- ☐Lines exposed in an open hole are protected, supported, or removed so nobody gets hurt. (29 CFR 1926.651(b)(4))
- ☐Dig by hand within 2 feet of any mark. (NIOSH Publication No. 2022-139)
Quotes checked word for word against the official OSHA text on October 5, 2026. This is a summary for a crew talk, not legal advice; the full official text governs. How we check
Crew discussion questions
- Do we have a valid locate ticket for today’s digging, and when does it expire?
- Where are the marks, and does anything about them look wrong or incomplete?
- What private lines could exist on this property that were never marked?
- What is our exact response if we smell gas?
Applicable OSHA standards
29 CFR 1926.651
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