A judge has ruled against two Isle of Palms property owners who challenged the state’s authority to stop construction of seawalls that worsen erosion of the public beach.

In an unexpectedly strong opinion that supports the state’s 37-year-old beach protection law, Judge Ralph King Anderson III said South Carolina has authority over all areas of the sandy beach, despite arguments by the property owners that it does not.

The preliminary ruling is not the final word on the issue, but it gives an idea of how he interprets the coastal law as his court prepares to hear the property owners’ full legal challenge over seawall construction next week.