Confusion about what a new law means for Florida beaches is prompting fears and political attacks.Advocacy group For Our Future Florida used HB 631 as a wedge in the U.S. Senate race, where Democratic incumbent Bill Nelson is facing a challenge from Republican Gov. Rick Scott, who signed the bill into law in March."On #EarthDay, we want to thank @SenBillNelson who has always fought for and defended the health of Floridaís coastlines and environment, while @FLGovScott just signed a bill that could make most of Floridaís beaches private," For Our Future Florida tweeted April 22.Please pause before cancelling your summer vacation. This claim needs a fact-check.In reality, more than half of Florida beaches are already privately owned. The new law, opposed by many environmental groups, affects the procedure for local governments that want to make private beaches public.Starting July 1, any city or county that wants to enact an ordinance to make private beaches public will have to go through the courts.The sound bite from For Our Future Florida rests on the notion that private beach owners will use the law to limit public access. But we donít know how those owners will react.What law will changeThe law Scott signed isnít going to turn beaches that are public now over to private ownership.What it will do is make it harder to guarantee public access on beaches that were already privately owned.Before the new law, local governments could adopt ordinances guaranteeing the publicís access to privately owned beach property. Those ordinances stemmed from a legal principle known as "customary use.""Customary use" refers to the publicís historic access to the dry sand portion of the beach that may belong to a private property owner."The idea and custom goes all the way back to ancient Rome and falls under the same set of ideas as the sea belongs to everyone and all have an equal right to use it," said David Cullen, a lobbyist for the Sierra Club, which opposed the bill.For example, the owners of an oceanfront estate in South Beach may decide they do not like that beachgoers are setting up camp on the shoreside portion of their property. They install a fence and "no trespassing" signs to tell the public to stay away.The Florida Supreme Court ruled that if a private property owner tries to do this, then the local government could enact an ordinance guaranteeing the publicís use of that land under "customary use," following their usual notice and hearing process. If landowners wanted to challenge the ordinance, they would have to sue the local government.Lawmakers drafted HB 631 to put more of the onus on the government and to establish a uniform process that includes all the stakeholders.A situation in the Panhandleís Walton County, which passed ordinances based on this "customary use" doctrine in 2016, illustrates why some lawmakers supported the bill.After the ordinance was passed in Walton County, some beach property owners filed lawsuits to overturn it. The U.S. District Court for the Northern District of Florida upheld the countyís ordinance, but landowners appealed that decision. "Without the courts involved on the front end, individual property owners could and did sue to challenge county ordinances around the state," said Rep. Paul Renner, R-Palm Coast, in a letter to the editor for the Palm Coast Observer website. "The taxpayers were on the hook for legal fees to defend every individual case against the county and pay any damages awarded if the county got it wrong."What HB 631 means for beach accessStarting July 1, local governments that seek to adopt an ordinance that is premised on customary use rights must first notify all the owners of land that might be implicated, and then file a proceeding in court.The court will decide the question of whether the public has customary use rights in that specific area.The Sierra Clubís Cullen predicts the law will embolden people to stick fences and "no trespassing" signs on their properties. If that happens, local governments will have a bigger legal hurdle to clear before guaranteeing the publicís access to that area.That said, the new law does not affect any property or beach use rights. It doesnít affect the rights the public had to use the dry sand beach before it was enacted, nor does it affect landownersí rights.Law experts and leaders in the beach communities emphasized that the public should not feel compelled to change patterns of historic beach usage as a result of the lawís passage.We rate this claim Mostly False.Read more rulings at PolitiFact.com/florida.