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SESK: Stuff Everyone Should Know · sesk.info/osha-utility-locate-before-excavating

What must an employer do before excavating near underground utilities?

Find where underground utilities are before digging.

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  1. Dig slowly by hand and watch for lines
  2. Ask the crew if anyone knows where lines are
  3. Determine where underground utilities are before digging ✔

Why: 1926.651(b)(1) requires the estimated location of sewer, phone, fuel, electric, water and other underground lines to be determined before an excavation is opened.

Huh, didn't know that: Calling 811 is the common way to have underground utility lines located before digging.

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Why did the utility locate happen before digging? To avoid underground surprises.
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References

Answer: Determine where underground utilities are before digging. 1926.651(b)(1) requires the estimated location of sewer, phone, fuel, electric, water and other underground lines to be determined before an excavation is opened.

  1. 29 CFR 1926.651(b)(1) www.law.cornell.edu/cfr/text/29/1926.651
    shall be determined prior to opening an excavation
    Checked 2026-10-10.
  2. OSHA 2226, Trenching and Excavation Safety www.osha.gov/sites/default/files/publications/OSHA2226.pdf
    One common industry practice is to call 811, the "Call Before You Dig" number
    Checked 2026-10-10.

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