There is no single federal statute that bans magnet fishing nationwide, but the activity is illegal in several clearly defined places and restricted in many more. Where magnet fishing is illegal in the United States comes down to a layered mix of federal regulations, one statewide ban, state and local park rules, private property law, and antiquities statutes that control what you’re allowed to pull out of the water even in places where dropping a magnet is otherwise fine.
National Parks and NPS Land
Magnet fishing is prohibited across the entire National Park System. Federal regulations make it illegal to possess or use a “mineral or metal detector, magnetometer, side scan sonar, other metal detecting device, or subbottom profiler” on NPS-managed land.1eCFR. 36 CFR 2.1 – Preservation of Natural, Cultural and Archeological Resources The Park Service has confirmed that this rule reaches magnet fishing specifically; Cape Hatteras National Seashore’s compendium, for example, states that the metal-detecting-device prohibition “applies to ‘magnet fishing’ within the boundaries.”2National Park Service. Laws and Policies – Cape Hatteras National Seashore The ban covers national parks, monuments, seashores, battlefields, lakeshores, and every other unit the NPS manages.
The regulation carves out only narrow exceptions: devices broken down and packed so they can’t be used, electronics needed for boat or aircraft navigation, and equipment used for authorized scientific or administrative purposes.1eCFR. 36 CFR 2.1 – Preservation of Natural, Cultural and Archeological Resources A strong neodymium magnet on a rope, carried into a national park, is prohibited equipment.
Military Bases and Other Federal Property
Military installations generally prohibit magnet fishing under their own recreation rules. In a 2024 incident at Fort Stewart, Georgia, three magnet fishers were cited for recreating without a permit, entering a restricted area, and unauthorized magnet detecting.3U.S. Army. Magnet Fishers Catch Break in Federal Court, Magnet Detecting Remains Illegal on Federal Property Each base sets its own policy, and most treat magnet fishing the way they treat metal detecting: banned unless specifically authorized.
Other federally managed lands, including national wildlife refuges and national forests, often have their own restrictions on removing objects or disturbing natural and cultural resources. The rules vary by managing agency, so a waterway that isn’t inside a national park is not automatically open.
Statewide and State Park Bans
South Carolina is the clearest example of a statewide ban. The South Carolina Underwater Antiquities Act prohibits indiscriminate collection of artifacts using equipment deployed from the water’s surface, including tethered magnets. The state’s Institute of Archaeology and Anthropology does not issue hobby licenses for magnet fishing and has called the practice “potentially destructive.”
Other states don’t ban the activity outright but impose heavy restrictions. Several prohibit removing artifacts of any age from state waters, and many state parks ban metal detecting devices under general park regulations. Those rules typically sweep in magnet fishing even when they don’t name it. The landscape changes often enough that checking your state’s park rules and fish-and-wildlife regulations before you go is the only reliable approach.
Private Property
Dropping a magnet into a privately owned pond, canal, or stretch of river without the landowner’s permission is trespassing. Many waterways that look public are privately owned, and in some states the riverbed itself is private even where the public has a right to float on the surface. If there is any doubt about who owns the water or the land underneath, get written permission before you fish. Verbal agreements fall apart quickly if anyone complains.
Archaeological Sites and Historic Artifacts
Even where magnet fishing is legal, what you pull up can be its own crime. Under the Archaeological Resources Protection Act, removing any artifact at least 100 years old from federal or Native American lands without a permit is a federal offense.4Office of the Law Revision Counsel. 16 USC Ch. 1B – Archaeological Resources Protection A first offense carries fines up to $10,000 and up to one year in prison, with higher penalties for items of greater value and for repeat offenders.5eCFR. 36 CFR Part 296 – Protection of Archaeological Resources: Uniform Regulations The law reaches all land the federal government owns or administers: national parks, national forests, wildlife refuges, Bureau of Land Management land, and tribal trust land.
The 100-year threshold is easy to trip without meaning to. A corroded iron tool, a piece of old hardware, or a cannonball fragment can all qualify, and not knowing an item’s age is not a defense.
Shipwrecks and Submerged Sites
The Abandoned Shipwreck Act gives states ownership of abandoned shipwrecks embedded in their submerged lands, on state submerged lands and listed or eligible for listing on the National Register of Historic Places, or embedded in state-protected coralline formations. “Embedded” means the wreck is firmly fixed in the bottom so that excavation tools are needed to reach it.6Office of the Law Revision Counsel. 43 USC Ch. 39 – Abandoned Shipwrecks Pulling artifacts from a protected wreck, even by accident, can violate the federal statute and whatever state management plan applies. Coastal waters, historic harbors, and rivers with known wrecks are legally sensitive ground.
Bridges, Dams, and Submerged Cables
Magnet fishing near bridges, dams, locks, and power plants is restricted or outright prohibited in most jurisdictions. These areas are typically managed by the U.S. Army Corps of Engineers, local port authorities, or utility companies, and security concerns alone can prompt a citation. Waterways carrying heavy commercial traffic may require permits for any recreational use.
Submerged utilities are a less obvious hazard. The Submarine Cable Act prohibits certain activities within one nautical mile of a vessel actively laying or repairing a submarine cable, and within a quarter nautical mile of buoys marking a cable’s position.7National Oceanic and Atmospheric Administration. Submarine Cables – Domestic Regulation That statute targets fishing operations near active cable work rather than casual magnet fishing, but dragging a powerful magnet across a submerged fiber optic or power line can create liability for damaging critical infrastructure.
Firearms, Ordnance, and Hazardous Finds
Magnet fishers pull firearms out of the water with surprising regularity. If you haul up a gun, don’t clean it, don’t try to identify it, and don’t put it in your car. Set it down, step back, and call your local police department’s non-emergency line, or 911 if you’re somewhere a passerby could pick it up. Recovered firearms are often tied to criminal investigations, and holding onto one without reporting it can create serious legal problems.
Unexploded ordnance is more dangerous still. Grenades, mortar rounds, and old military munitions turn up in rivers near former training areas, and some remain live decades after being lost. If your magnet brings up something that looks like a munition, do not pull it out of the water, do not touch it, and do not try to move it. Back away, mark the spot if you can do so safely, and call 911.
Sealed containers of unknown origin and anything that might carry hazardous residue deserve the same treatment: leave it, call for help.
What You’re Allowed to Keep
“Finders keepers” is largely a myth here. Jewelry, cash, safes, and other items of real value may legally belong to the original owner or to the owner of the property where you found them. Most states have lost-property statutes requiring reasonable efforts to find the owner or to turn valuable items over to authorities. Keeping a clearly valuable item without reporting it can amount to theft.
Anything with potential historical or archaeological significance should be reported to your state’s historic preservation office. Removing those items, especially from public waterways or any government-managed land, can violate the Archaeological Resources Protection Act on federal land or equivalent state antiquities laws elsewhere.4Office of the Law Revision Counsel. 16 USC Ch. 1B – Archaeological Resources Protection When in doubt, photograph the item in place, record the GPS coordinates, and contact your state archaeologist before taking anything that looks old or unusual.
Disposing of What You Pull Up
Hauling up scrap metal and leaving it on the riverbank is illegal dumping in every jurisdiction. Fines vary by state, running from modest amounts for small quantities to tens of thousands of dollars for larger loads. Nonhazardous scrap can typically go to a recycling facility or municipal waste site. Anything that might contain hazardous material, including batteries, sealed containers, or items with chemical residue, should go through your local waste management authority rather than a regular dumpster.
How to Confirm the Rules for Your Spot
Work from the specific location outward. Start with whoever manages the water: a city parks department for a municipal lake, a state parks office for state land, the relevant federal agency for federal land. Many of those offices publish compendiums or park rules that address metal detecting, and the person who answers the phone can usually tell you whether magnet fishing is treated the same way.
If the waterway crosses jurisdictions, check each one. A river that’s legal to fish in one county can flow into a restricted stretch a mile downstream. Ask about permits as well. Some public lands require them for metal detecting activities, and where no magnet-specific permit exists, a general metal detecting or recreational use permit may apply.
Document the answers you get. If a ranger or local official tells you the activity is allowed, note who you spoke with and when. The rules are evolving quickly as the hobby grows, and what was tolerated last season may be prohibited this one.