Metal Detecting in Wisconsin

1. The rule, in full

Wisconsin – Wis. Stat. 44.47 (re-read 20 Sep 2026)

Read from the consolidated statute: chapter 44 PDF at docs.legis.wisconsin.gov, 2023-24 Wis. Stats. published and certified under s. 35.18 on 4 September 2026, parsed locally.

Operative text, 44.47(2):

"UNLICENSED FIELD ARCHAEOLOGY PROHIBITED. No person other than the state archaeologist and individuals licensed by the director may engage in any field archaeology on any state site or site owned by a political subdivision."

Definition, 44.47(1)(d):

"'Field archaeology' means the study of the traces of human culture by means of surveying, digging, sampling, excavating or removing objects."

Scope: reaches municipal land, but only archaeological sites on it. The reach is bounded by two more defined terms:

44.47(1)(b): "'Archaeological site' means any land or the bed of any stream or lake where there are objects or other evidence of archaeological interest, aboriginal mounds and earthworks, ancient burial grounds, prehistoric and historical ruins, Indian mounds, historic and prehistoric watercraft and associated objects, aircraft and other archaeological and historical features." 44.47(1)(e): "'Local site' or 'local archaeological site' means an archaeological site owned by a political subdivision."

So the section bites on a city park only if that park is an archaeological site. An ordinary municipal ballfield is not reached at all.

Why this entry was rewritten

Wisconsin's definition of "field archaeology" is the Massachusetts definition of "field investigation", minus one clause. Set side by side:

Wis. Stat. 44.47(1)(d): "the study of the traces of human culture by means of surveying, digging, sampling, excavating or removing objects." 950 CMR 70.04 (Mass.): "the study of traces of human culture or other remains of any land or water site by means of surveying, digging, sampling, excavating or removing surface or subsurface objects, or the entrance onto a site with that intent."

That is not a coincidence of drafting; it is the same instrument in two states. Wisconsin was previously classified as reaching "unlicensed field archaeology, an activity rather than a find", which was correct as far as it went, but it was filed as adjacent to the group rather than inside it. With the Massachusetts definition in hand the two plainly belong together: both reach what the searcher is studying, not what the searcher does to the ground.

The difference between them is real and must not be smoothed over.

• Land reach. Massachusetts reaches all commonwealth and political-

subdivision land. Wisconsin reaches only archaeological sites owned by a political subdivision.

• Intent. Massachusetts extends to "the entrance onto a site with that

intent" – walking on is enough. Wisconsin requires actually surveying, digging, sampling, excavating or removing. A Wisconsin detectorist who walks a local site and switches on has not yet engaged in field archaeology; surveying it arguably starts the moment the coil moves.

Express limiting clause, 44.47 preamble:

"This section is not intended to burden persons who wish to use state public property for recreational and other lawful purposes or to unnecessarily restrict the use of state public property."

Read this clause carefully before relying on it. It says "state public property", twice, and not municipal property. A reader given this quotation as reassurance about a city park is being given a sentence that does not address their land. The entry should carry the clause and that limitation together, or not carry it at all.

Permits exist but route through the city, 44.47(4)(a):

"The director may not issue a permit for field archaeology on a site owned by a political subdivision without the written approval of the political subdivision which owns the site. No state agency or political subdivision may withhold that approval without good cause."

So unlike Kansas and New Mexico, there is a route – and it needs the municipality's written approval, which puts the city back in the loop. Worth noting on the page, because it is the only state so far where the municipal authority has a statutory say over a state permit.

Penalties, 44.47(7)(a):

"1. Whoever violates sub. (2) … shall forfeit not less than $100 nor more than $500.
2. Whoever intentionally defaces, injures, destroys, displaces or removes any archaeological object or data belonging to the state, or intentionally interferes with evidence or work on any state site or site owned by a political subdivision for which a permit has been issued … shall be fined not less than $1,000 nor more than $5,000.
3. Whoever removes any archaeological object from a state site or site owned by a political subdivision for commercial gain … shall forfeit an amount not to exceed 2 times the gross value gained or the gross loss caused by the disturbance, whichever is the greater, plus court costs and the costs of investigation and prosecution."

An asymmetry worth recording. 44.47(5) reserves title to the state for "all objects found and data gathered in field archaeology on state sites". It does not say the same for local sites. Wisconsin claims ownership of finds from its own land and is silent about finds from city land, which is the opposite of Massachusetts, where 950 CMR 70.03(2) makes every specimen collected under permit the property of the Commonwealth regardless of whose land it came from.

"Object" is a defined term and excludes two things, 44.47(1)(f): "'Object' means an article, implement or other item of archaeological interest. 'Object' does not include human remains, as defined in s. 157.70 (1) (f), or a sunken log, as defined in s. 170.12 (1) (b)."

What it does NOT prohibit: recreational metal detecting as such, and nothing at all on municipal land that is not an archaeological site.

Directory entry should read: in Wisconsin, only the state archaeologist and licensed individuals may engage in field archaeology – the study of traces of human culture by surveying, digging, sampling, excavating or removing objects – on an archaeological site owned by the state or by a city, village, town or county. It should NOT read that metal detecting is prohibited in Wisconsin city parks, and it should NOT quote the recreational-use clause without saying that the clause speaks to state property only.

2. Cities in Wisconsin that publish a rule

Awaiting review. None of the city or county rows publishes until its status is set and its quotation chosen by hand.

3. County rules

Awaiting review. None of the city or county rows publishes until its status is set and its quotation chosen by hand.

4. Cities checked — no published rule

Awaiting review. None of the city or county rows publishes until its status is set and its quotation chosen by hand.