Not really private but some townships charge an entry fee to help with cost of lifeguards,beach maintenance and so forth.Probably private beach front.
Some do,some don't.I'm guessing those areas that charge don't want anyone in the water if there is no lifeboy on duty.What does water have to do with the beach though? You'll spend more time in the sand then in the ocean
Especially in New Jersey. I hear a lot of people been buried in the sand there.What does water have to do with the beach though? You'll spend more time in the sand then in the ocean