Salt air can work on a beach town's plumbing from the outside while age works from within. When a line finally gives way, you'll know it. If water is getting loose in your house right now, call (619) 650-0028 and we'll send someone out.
For the quieter versions, the weep at a fitting, the corrosion you can see on the metal, the pressure that isn't what it was, it pays to act early near the coast. A fitting that's weeping this month can be a fitting that fails later, and getting it looked at in between is when the repair stays small.
The response is the same at every stage. Find the actual failure, understand what caused it, fix the cause and not just the symptom. When the cause is one corroded section, one repair is usually enough. When the cause is a system that's spent decades in salt air, you get a straight conversation about what that means, in plain English, with the decision entirely yours.