There is no single metal detecting permit in California. Whether you need permission, and whether you can detect at all, depends entirely on who manages the ground under your coil. State parks, national parks, national forests, BLM land, city parks, and private property each answer to a different agency with different rules, and the penalties for getting it wrong range from a citation to a federal felony.
The practical rule: identify the managing agency for the specific spot you want to detect, then call that agency before you go. A location that looks identical to the one next to it can be governed by completely different law.
Who Manages the Land Decides the Rule
Three categories cover almost every site in the state. State-managed property runs through the California Department of Parks and Recreation. Federally managed property splits among the U.S. Forest Service, the Bureau of Land Management, and the National Park Service, each with its own regulations. Local and private property covers city and county parks, municipal beaches, and any land in private hands.
Permissions to detect, dig, and keep what you find change completely across those categories. A modern coin you can legally pocket on BLM land could get you cited in a state park and arrested in a national park. Start with the agency, not the map.
California State Parks and Beaches
Detecting on California State Park property is tightly restricted. The California Code of Regulations prohibits disturbing earth, sand, or gravel in state park units and separately prohibits removing any object of archaeological or historical interest or value.{1California State Parks. California Code of Regulations} Individual park superintendents can issue posted orders that go further, including banning possession of a metal detector inside a specific park unit.{2California Department of Parks and Recreation. Possession of Metal Detectors – California State Parks}
Some state beach units allow limited detecting in the wet sand zone or in designated recreation areas, but that is never a statewide right. It depends on the posted orders for that unit. Contact the relevant State Park District office before you visit to confirm whether the activity is allowed and whether a Special Event or Collection Permit is needed. In practice, most state park units either prohibit detecting outright or limit it to narrow areas where you are not digging into dry sand or turf.
National Parks: A Flat Ban
Metal detecting is prohibited in every unit of the National Park System, and you cannot even carry an assembled detector inside park boundaries. Federal regulations make it illegal to possess or use a mineral or metal detector, magnetometer, or similar device in any national park.{3eCFR. 36 CFR 2.1 – Preservation of Natural, Cultural and Archeological Resources} The only exception is a detector that is completely broken down and packed so it cannot be used, such as when you are transporting it through a park to reach somewhere else.
California has nine national parks, including Yosemite, Joshua Tree, Death Valley, Sequoia, and Redwood, plus national monuments, national recreation areas, and other NPS-managed sites. The ban covers all of them. Violations are federal offenses, and rangers do enforce them.
National Forests and BLM Land
Federal lands managed by the U.S. Forest Service and the Bureau of Land Management are the most accessible public lands for detecting in California. Both agencies generally allow recreational detecting for modern lost items in areas open to general public use, such as campgrounds, picnic areas, and dispersed recreation zones. The BLM explicitly permits prospecting with hand tools including metal detectors and allows collectors to keep modern money found on public land.{4Bureau of Land Management. Can I Keep This?}
BLM regulations define “casual use” as activities causing no or negligible disturbance. A metal detector, gold pan, hand tools, and battery-operated drywashers all qualify and do not require a permit or notice.{5eCFR. 43 CFR Part 3800 – Mining Claims Under the General Mining Laws} The moment you bring in mechanized earth-moving equipment, motorized drilling, chemicals, explosives, or create more than negligible surface disturbance, you leave casual use and enter permitted operations.
The hard legal boundary on all federal land is the Archaeological Resources Protection Act. ARPA treats any object at least 100 years old as an archaeological resource belonging to the United States government.{6Office of the Law Revision Counsel. 16 USC Ch. 1B – Archaeological Resources Protection} Removing, excavating, or damaging anything that meets that age threshold without a federal permit is a criminal offense, with fines that can reach $100,000 and up to five years in prison for repeat offenders, plus forfeiture of vehicles and equipment used in the violation.{7eCFR. 43 CFR Part 7 – Protection of Archaeological Resources} ARPA excavation permits are reserved for professional archaeological research; hobby detecting does not qualify. If an item’s age is uncertain, treat it as protected.
Gold Prospecting on Public Land
Under the 1872 Mining Law, you have a statutory right to prospect for minerals on open, unappropriated BLM public land. Detecting for gold nuggets and other mineral deposits falls squarely within that right, as long as you stay within casual use and use only hand tools and battery-powered equipment.{5eCFR. 43 CFR Part 3800 – Mining Claims Under the General Mining Laws}
National Forests in California allow mineral prospecting under similar principles. Individual forests can impose extra restrictions through forest orders, including seasonal closures to protect waterways or wildlife. Check the forest’s motor vehicle use map and any current orders before you go. Many gold-bearing areas in the Sierra Nevada foothills also have active mining claims, and detecting on someone else’s valid claim without permission is trespassing on their mineral rights even where the surface is public.
City and County Parks
Rules for detecting on municipal land vary widely across California’s hundreds of cities and counties, and there is no central database. Call the specific parks department or city clerk’s office for each location. Some cities allow detecting in designated park areas with a simple registration, some ban it entirely, and some have no written policy at all.
Where detecting is allowed, local ordinances commonly limit tools to small hand trowels or scoops with a maximum blade length, exclude sports fields, playgrounds, landscaped gardens, and areas near irrigation systems, restrict activity to daylight hours, and require every hole to be filled immediately and completely. That last rule is the one that most often costs detectorists their access. One unfilled divot on a soccer field, and the parks department bans the activity for everyone. Carry a ground cloth for your soil and leave the ground looking untouched.
Private Property
Detecting on private land in California requires the owner’s explicit permission. Entering without consent is trespassing, a misdemeanor that can carry fines and up to six months in jail. Written permission is not legally required, but a one-page agreement covering who keeps what is recovered, who bears liability for any property damage, and which areas are off-limits protects both you and the landowner. Without a written agreement, the landowner generally has the stronger claim to anything pulled from their soil.
State archaeological and cultural resource laws still apply on private property. Finding an artifact on your friend’s ranch does not put it outside the reach of those rules.
Artifacts, Burials, and Shipwrecks
California’s own laws sit on top of federal protections. The Public Resources Code declares the state’s archaeological resources irreplaceable and endangered, and removing or damaging any object of archaeological or historical significance from public land is prohibited under state law regardless of age.{8California Legislative Information. California Code PRC 5079.60}
The heaviest penalties involve Native American cultural resources. Possessing Native American artifacts or human remains taken from a grave or burial cairn after January 1, 1988 is a felony punishable by state prison, and trafficking in burial items carries the same classification.{9California Legislative Information. California Public Resources Code 5097.99} These laws apply whether the item came from public or private land. If you uncover something that could be an artifact, a bone, or a burial object, stop digging, leave everything in place, and report the find to the managing agency or local authorities. Disturbing the surrounding soil destroys the site’s context even if you take nothing.
Shipwrecks have their own framework. Under the federal Abandoned Shipwreck Act, the United States claimed title to abandoned shipwrecks embedded in state submerged lands, generally within three miles of shore, and transferred that title to the states.{10National Park Service. Abandoned Shipwreck Act of 1987} California owns abandoned wrecks in its coastal waters, and traditional maritime salvage rules do not apply. Recovering artifacts from a wreck site on state submerged land without authorization from the California State Lands Commission is illegal, including scattered items on the seafloor nearby. Beachcombing above the waterline is a separate activity, but anything that looks tied to a historic wreck should be reported, not pocketed.
What You Owe on What You Keep
Two obligations follow a valuable find in California. First, state law: if you find lost personal property worth $100 or more, you must turn it over to local law enforcement within a reasonable time and file a sworn statement describing the item and where you found it. If no owner claims it within 90 days, title transfers to you. For items worth $250 or more, the police or sheriff must also publish a notice in a local newspaper, and the owner has an additional seven days after publication to come forward.{11California Legislative Information. California Civil Code 2080-2080.3}
Second, federal tax. Found property is gross income in the year you take undisputed possession, reported at fair market value in U.S. dollars.{12eCFR. 26 CFR 1.61-14 – Miscellaneous Items of Gross Income} That covers gold nuggets, old coins, jewelry, and cash. Report the value on Schedule 1 of Form 1040 as other income.{13Internal Revenue Service. Instructions for Form 1040} A logbook of dates, locations, descriptions, and estimated values makes reporting straightforward and gives you a paper trail if the IRS asks.