Newport Beach has an ordinance against dogs on the beach without a leash--but it is either not very well understood or not very well patrolled. The ordinance states that from June 15 to Sept. 15, dogs can't do a thing on the beach or sidewalks; they are not even allowed on the beach if they are on a leash. From Sept. 15 to June 15, dogs will be allowed on the beach from 9 a.m. to 5 p.m. if they are on a leash.
Of course, all of these good leashed dogs wouldn't dare make a mess on the beach, where people lay on their towels. I have witnessed people tippy-toeing across the sand to keep from stepping on the things that dogs do.
Now dogs are not supposed to do these things, especially when their owners have a firm grip on their leash (if they are on a leash). Most dog owners leave the mess for property owners or beach maintenance people to clean up.
Over the past 20 years (especially within the last 10), I have developed a reputation for being called a "deputy dog." Ask anyone in the area where Deputy Dog lives and they'll tell you. I divide my time between my place of residence in Newport Beach and in Anaheim, spending the entire summer in Newport Beach.