Michigan Excavating Contractor Insurance: MISS DIG, XCU and the Endorsement to Look For

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Michigan excavating contractor insurance hinges on two facts that most of the internet reports backwards. Michigan's dig-notice law is a 72-hour clock, not the "three working days" nearly every contractor handbook still prints. And explosion, collapse and underground property damage — the XCU hazards — are covered by the standard modern liability form unless someone endorsed them away. Getting both right tells you exactly what to look for on your own policy. If you run an established site work, sewer, utility or excavating contractor in Michigan, start here.

MISS DIG: it is 72 hours, and the way it counts matters

Michigan's dig law is the MISS DIG Underground Facility Damage Prevention and Safety Act, 2013 PA 174, MCL 460.721 through 460.733, effective April 2014. It replaced the older statute, and with it the old timing rule.

The current requirement: notice at least 72 hours, but not more than 14 calendar days, before the start of any blasting or excavation. The old law said three full working days. An enormous amount of Michigan content — including municipal handbooks and contractor blogs — still says three working days. It is out of date.

The 72 hours is not raw calendar time either. The statute prescribes how to count it:

• Notice given during business hours: the clock runs from the time of notification.
• Notice given before 7 a.m. on a business day: the clock begins at 7 a.m. that day.
• Notice given on a non-business day, or after 5 p.m.: the clock begins at 7 a.m. the next business day.
• All non-business-day hours are excluded from the count.

Which is why "three working days" survives in the wild — the practical effect is roughly that. But the statute is written in hours, and the counting rules are what a dispute would turn on.

The rest of the act your crews need to know

• Ticket life. A dig notice is valid 21 days from the start date, or 180 days if the notice indicates the work will not be finished within 21 days.
• The caution zone. Before using power equipment, the excavator must expose all marked facilities in the caution zone by soft excavation. The caution zone extends 48 inches from either side of the marks. For excavation running parallel to a facility, soft excavation at intervals is required to establish precise location.
• Penalties. Knowingly damaging a facility and failing to promptly notify the owner, concealing damage by backfilling, and willfully removing or destroying locate markings are misdemeanors carrying up to one year or a fine of up to $5,000, or both. The Public Service Commission may separately impose civil fines up to $5,000 per violation, though a first violation is capped lower where there was no injury or significant property damage and the excavator admits responsibility.
• The part that actually costs money. The act expressly does not limit the right of an excavator, facility owner or facility operator to seek actual damages in a civil action — and note that it cuts both ways, preserving your right to recover from a facility owner who marked wrong or failed to mark at all. The MPSC fine is not the exposure. The utility's claim — restoration, lost service, emergency response, and third-party claims from everyone whose gas or fiber went down — is, and a single strike on a main can dwarf the fine by orders of magnitude.

Call before you dig is not a slogan in this trade; it is the difference between a documented defense and an indefensible claim. Keep the ticket number, the positive responses, and photographs of the marks. Your carrier will ask, and so will the utility's attorney.

XCU: the exclusion everyone has backwards

Ask most contractors about XCU — explosion, collapse and underground property damage — and you will hear that the liability policy excludes it and you have to buy it back. That is backwards on the current form.

Under the standard modern ISO commercial general liability form, the three hazards are covered by default. They come out only if the insurer attaches an endorsement:

• CG 21 42 excludes the explosion, collapse and underground property damage hazards for operations listed on its schedule. It does not apply to work performed by others on your behalf, nor to damage within the products-completed operations hazard.
• CG 21 43 is the companion, used when the insurer wants to exclude the hazards generally but cover a specifically described operation.

The endorsement itself defines the terms: the underground property damage hazard is damage to underground wires, pipes, sewers, tanks and tunnels caused by mechanical equipment during grading, excavation or pile driving. That is a description of your workday.

So the question for a Michigan excavator is not "did I buy XCU back." It is "is CG 21 42, CG 21 43, or any carrier's own XCU exclusion on my schedule of forms?" — and, on a surplus lines or proprietary form, whether the base form excluded the hazards to begin with. That is a five-minute check on paperwork you already have, and it is the single highest-value thing this article can tell you to do.

What is still excluded, and the phrase that limits it

Two exclusions do real work on an excavation job, and both are narrower than they look:

• Exclusion j.(5) bars damage to that particular part of real property on which you or your subs are performing operations, when the damage arises out of those operations. No subcontractor exception.
• Exclusion j.(6) bars that particular part of property that must be restored, repaired or replaced because your work was incorrectly performed on it — with a giveback: it does not apply to damage falling within the products-completed operations hazard.

"That particular part" is the phrase to build your understanding around. These exclusions are scalpel-shaped, not blankets. The specific portion you were working on is out; damage your operation caused to the rest of the property is a different analysis. That distinction is where excavation claims are won and lost.

Michigan's own class codes for site work

Michigan classifies workers' compensation under its own manual through the Compensation Advisory Organization of Michigan, and its phraseology differs from the national system in ways that matter here.

Michigan's Code 6217 covers blasting rock, caisson and cofferdam work, dam or lock construction, earth moving or placing, rock excavation NOC, grading of land, landfill operations, shaft sinking and tunneling, including borrowing, filling and backfilling. The manual's definition is broader than the title: operations involving the moving of earth, rocks and boulders not specifically classified elsewhere, using bulldozers, trenchers, backhoes, graders and hand tools, for footings, foundations, pools, ponds, waterproofing and landscape work.

The routing rules are where the money is:

• Street or road construction excavation and grading, and airport runway work, goes to 5507, covering sub-surface work up to the point of actual paving.
• Sewer construction is 6306, covering all storm and sanitary sewer construction regardless of pipe size or depth, including trenching, boring, pipe laying and connections.
• Gas mains, oil or gas pipeline, water main and steam main construction is 6319.
• Drainage or irrigation systems, septic tank installation and underground burial vaults is 6229. Pile driving is 5040. A permanent yard is 8227, and is never available at a construction site.

The rule worth featuring, because it ties directly to the certificate discipline every contractor should already have: Michigan's manual assigns sewer excavation to 6217 only when it is done by a separately insured specialist contractor. When the whole sewer job is done by the same contractor, or the separate parts are done by uninsured subcontractors, the excavation is folded into the sewer construction classification 6306 — which is rated differently. That is a direct, Michigan-specific premium consequence of using uninsured subs, on top of the liability under MCL 418.171 that already makes you responsible for an uninsured sub's comp claim. Our post on 1099 subcontractors and Michigan workers' comp covers that liability, and our class code guide covers the classification side.

Equipment: yours, and the ones you rent

Heavy equipment is insured on an inland marine contractors equipment floater, not on your property policy, which is premises-based and does not follow a machine to a job site. Excavators, skid steers, dozers, attachments and small tools all live there, on the job, in transit and in storage.

Rented and leased equipment deserves a specific conversation rather than an assumption. Some forms extend automatically to equipment rented after the effective date, often for a limited time; others do not. Meanwhile the rental agreement you signed at the yard routinely makes you responsible for full replacement value plus loss of use — an obligation broader than what many floaters pay. Read both documents, and check whether loss of use is covered before the machine goes down, not after.

Pollution and soil erosion

Excavation turns up contaminated soil, and Michigan's Soil Erosion and Sedimentation Control program under Part 91 of NREPA generally requires a permit for earth change activity disturbing an acre or more, or within 500 feet of a lake or stream.

Keep the insurance connection honest here. An SESC violation is a regulatory matter, and the liability form expressly strips any loss, cost or expense arising out of a statutory or regulatory requirement to test for, monitor, clean up, remove, contain or treat pollutants. But that same exclusion has a giveback: it does not apply to liability for property damage the insured would have had in the absence of the regulatory demand. So the fine and the ordered cleanup are your cost; the downstream neighbor's silted pond is a different claim. If you regularly work on sites with known contamination, contractors pollution liability is a separate product worth pricing.

Frequently Asked Questions

How far in advance do you have to call MISS DIG in Michigan?

At least 72 hours and not more than 14 calendar days before starting excavation or blasting, under the MISS DIG Underground Facility Damage Prevention and Safety Act, 2013 PA 174. The hours are counted with non-business-day hours excluded: notice before 7 a.m. on a business day starts the clock at 7 a.m., and notice after 5 p.m. or on a non-business day starts it at 7 a.m. the next business day. The older "three full working days" rule is from the prior statute and is still widely republished.

Does general liability cover hitting an underground utility line?

On the current standard form, explosion, collapse and underground property damage are covered by default. They are removed only when an endorsement is attached, commonly CG 21 42 or CG 21 43. So the question is not whether you bought XCU back, but whether one of those endorsements is on your schedule of forms. Check it before you need it. Note that damage to the particular part of property you were working on remains excluded regardless.

What happens if I damage a gas line without calling MISS DIG?

Michigan's act makes it a misdemeanor to knowingly damage a facility and fail to promptly notify the owner, or to conceal damage by backfilling, with penalties up to one year or a fine of up to $5,000, or both, and the Public Service Commission may impose civil fines up to $5,000 per violation. The larger exposure is civil: the act expressly preserves the facility owner's right to recover actual damages, which can include restoration, emergency response, lost service and third-party claims.

What workers' comp class code applies to excavating in Michigan?

Michigan's manual describes code 6217 as covering earth moving and placing, grading, rock excavation, tunneling and related operations. Road and street sub-surface work goes to 5507, sewer construction to 6306, gas and water main work to 6319, and drainage or septic work to 6229. Michigan's manual also assigns sewer excavation to 6217 only when performed by a separately insured specialist; otherwise it is folded into 6306.

Is rented excavating equipment covered by my policy?

It depends on your specific inland marine form, and it should not be assumed. Some contractors equipment forms extend to equipment rented or leased after the effective date for a limited period; others require it to be scheduled. Separately, rental agreements commonly obligate you for full replacement value plus loss of use, which is broader than many floaters pay. Compare the rental contract to the policy before the machine is damaged.

The bottom line

An excavating contractor's exposure is concentrated in two documents: the dig ticket and the schedule of forms. One decides whether you have a defense; the other decides whether you have coverage. Both are checkable this week.

We work best with established Michigan site work and utility contractors — crews on payroll, owned equipment, real contracts, and a few years of loss runs. If that describes your operation, send us your current declarations pages, your complete schedule of forms, your equipment schedule and your last two loss runs. We will tell you whether XCU has been endorsed off your policy before we talk about price. As an independent agency representing more than twenty commercial carriers, we can put an excavator with a market that writes the class rather than surcharging it. Call (248) 693-6455 or request a contractor review.