There is no single metal detecting permit in California. Whether you need written permission, whether you need to notify anyone, and whether you can legally swing a coil at all depends entirely on who manages the ground under your feet. State parks, national parks, national forests, Bureau of Land Management land, city parks, and private property each run on different rules, and a spot that is perfectly legal can sit a hundred yards from a spot that will get you cited or arrested.
Before any trip, identify the managing agency for the exact location and check that agency’s current rules. That one habit does more to keep you legal than any permit ever could.
Why the Land Manager Decides Everything
California land falls into three practical buckets: state-managed (California State Parks and Beaches, run by the Department of Parks and Recreation), federally managed (National Parks, National Forests, and BLM land, each under its own agency), and local or private (city and county parks, plus privately owned ground). Rules about digging, collecting, and keeping what you find change completely from one bucket to the next. A modern coin you can legally pocket on BLM land can get you cited in a state park and arrested in a national park. Figure out the jurisdiction first.
National Parks: Do Not Even Bring the Detector
This is the rule that catches the most people. 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.{1eCFR. 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 passing through a park to reach somewhere else.
California has nine national parks, including Yosemite, Joshua Tree, Death Valley, Sequoia, and Redwood, plus dozens of national monuments, national recreation areas, and other NPS-managed sites. All of them fall under the same ban. Violations are federal offenses, and rangers enforce them actively.
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.{2California State Parks. California Code of Regulations} Individual park superintendents can issue posted orders that go further, including banning possession of a metal detector entirely within a specific unit.{3California 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 this is not a statewide right. It depends on the posted order for that specific unit. Call the relevant State Park District office before you visit to confirm whether detecting is allowed and whether a Special Event or Collection Permit is required. In practice, most state park units either prohibit detecting outright or confine it to narrow areas where you are not cutting into dry sand or turf.
National Forests and BLM Land
Federal lands run by the U.S. Forest Service and the Bureau of Land Management are the most accessible public lands for detecting in California. These agencies generally allow recreational detecting for modern lost items in areas open to general public use, such as campgrounds, picnic grounds, 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?}
Individual National Forests can impose extra restrictions through forest orders, including seasonal closures to protect waterways or wildlife habitat. Check the specific forest’s motor vehicle use map and current orders before heading out.
The 100-Year Line Under ARPA
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.{5Office 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, and the permits are reserved for professional archaeological research, not hobby detecting. Penalties scale with the value of what was taken and run up to $100,000 in fines and five years in prison for repeat violations, plus possible forfeiture of vehicles and equipment used in the violation.{6eCFR. 43 CFR Part 7 – Protection of Archaeological Resources} If you have any doubt about an item’s age, treat it as protected and leave it in place.
Casual Use and When It Stops Being Casual
BLM regulations define “casual use” as activity that causes no or negligible disturbance to public lands. Using a metal detector, gold pan, hand tools, and battery-operated drywashers all qualify, and none of them require a permit or advance notice to the BLM.{7eCFR. 43 CFR Part 3800 – Mining Claims Under the General Mining Laws} Once you move to mechanized earth-moving equipment, motorized drilling, chemicals, explosives, or anything that creates more than negligible surface disturbance, you have left casual use behind and need to file either a notice or a plan of operations.
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 falls within this right as long as you stay within casual use and stick to hand tools and battery-powered equipment. National Forests in California allow mineral prospecting on similar terms.
Watch out for existing claims. Many of the popular gold-bearing areas in the Sierra Nevada foothills have active mining claims on them, and detecting on someone else’s valid claim without permission is trespass on their mineral rights even if the surface land is public. Check claim status before you dig.
City and County Parks
Rules on local park land vary across California’s hundreds of municipalities, and there is no central database. Call the specific parks department or city clerk for the location you have in mind. Some cities allow detecting in designated park areas with a simple registration, some ban it outright, and some have no written policy at all.
Where detecting is allowed, local ordinances commonly impose conditions like these:
- Tool limits, often a small hand trowel or scoop with a maximum blade length.
- Area restrictions keeping you away from sports fields, playgrounds, landscaped gardens, and irrigation systems.
- Time limits, usually daylight hours only or specific posted windows.
- A requirement to fill every hole immediately and completely.
Take the hole rule seriously. One unfilled divot on a soccer field is the most common reason a parks department bans detecting for everyone. Carry a ground cloth, pile your soil on it, and leave the spot looking untouched.
Private Property
Detecting on private property requires the landowner’s explicit permission. Entering without consent is trespassing, a misdemeanor under California law that can bring fines and up to six months in jail. Written permission is not legally required, but experienced detectorists prefer it because verbal agreements turn into disputes fast.
Who owns what you find on private land depends on your agreement with the owner. Without a written one, the landowner generally has the stronger legal claim to anything recovered from their soil. A one-page agreement covering who keeps what, who is liable for property damage, and which areas are off-limits protects both sides. California’s archaeological and Native American cultural protections still apply on private land.
Legal Lines That Follow You Everywhere
Archaeological and Native American Resources
California’s own archaeological protection laws apply on both public and private land, on top of any federal rules. The California Public Resources Code treats the state’s archaeological resources as irreplaceable and endangered,{8California Legislative Information. California Code PRC 5079.60} and removing, damaging, or destroying any object of archaeological or historical significance from public land is prohibited under state law regardless of age.
The most severe 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 time, and trafficking in burial items carries the same classification.{9California Legislative Information. California Public Resources Code 5097.99} These rules apply whether you were on public or private land when you found the item. If you uncover something that looks like it could be an artifact, a human bone, or a burial object, stop digging, leave it in place, and report the find to the managing land agency or local authorities.
Shipwrecks and Submerged Lands
Under the federal Abandoned Shipwreck Act, the U.S. government 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 shipwrecks in its coastal waters, and the traditional maritime laws of salvage and finds do not apply to them. Recovering artifacts from a shipwreck on state submerged land without authorization from the California State Lands Commission is illegal, including items scattered on the seafloor near a wreck. Beachcombing above the waterline is a different activity, but anything that looks tied to a historic wreck should be reported rather than pocketed.
Found Property and Taxes
If you find personal property worth $100 or more on any land in California, state law requires you to 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 publish a notice in a local newspaper, and the owner gets an additional seven days after publication to come forward before ownership passes to you.{11California Legislative Information. California Civil Code 2080-2080.3}
Found property is also taxable income. Federal regulations treat treasure trove as gross income in the year you take undisputed possession of it, valued in U.S. currency.{12eCFR. 26 CFR 1.61-14 – Miscellaneous Items of Gross Income} You report fair market value on Schedule 1 of Form 1040, line 8z (“Other income”).{13Internal Revenue Service. Instructions for Form 1040} A logbook with dates, locations, descriptions, and estimated values makes reporting straightforward and gives you something to show if the IRS ever asks.