Call 811 before the grinder starts

Missouri law changed in August 2025: people who dig must contact Missouri 811 two business days before starting, and, as reported, the locate ticket covers 21 days of work (confirm the exact window when you request your locate). Stump grinding disturbs soil, so call before the machine arrives.

Updated October 25, 2026

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The rule

• Contact Missouri 811 at least two business days before excavation. Weekends and legal holidays do not count (Diggins, MO explainer; Ameren Missouri on SB 133).
• The work should finish within 21 days of the start date. Past that you need a new ticket.
• Request a locate at missouri-811.org or by dialing 811.

What gets marked and what does not

The public locate service marks utility lines in the right-of-way and on your property up to the meter. It does not mark private lines: sprinkler wiring, an invisible dog fence, landscape lighting, a yard drain, a septic line or a private gas line to a grill or generator. Tell the pro about anything you know of, and mark sprinkler heads before the machine arrives.

Who calls

Often the pro does. Do not assume. Ask in the quote conversation, and if you are not sure, call yourself. It costs nothing and an unmarked line is a costly mistake.

Statute

The underlying law is Missouri's underground facility safety statute, RSMo 319.025, as amended in 2025.

Planning a job? Request a quote and mention what is buried in the yard.

Common questions

Does stump grinding count as excavation?

Missouri 811 defines excavation broadly, as any operation that moves or disturbs the ground. We found no source that mentions stump grinding by name, so we treat it as covered and advise you to call. Ask your pro who is making the call.

How many days ahead?

Two business days under SB 133, which took effect August 28, 2025, with weekends and legal holidays not counted. One news outlet reported three full working days, so call early and confirm with Missouri 811.

Is 811 free?

Yes, requesting a locate is free for the person digging.

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