I recently noticed three water spots in the ceiling on my first floor. Each spot was under an upstairs bathroom, two the same bathroom and the third a different one. I called the plumber, who came to investigate, and to make a long story short, discovered that each spot was under a joint that had a slow drip. The house was built in 2001, and it seems really odd to me that suddenly three different fittings are leaking at the same time! Any ideas what is going on? Someone asked me if I could see any blue primer around the old fittings, and the answer is no, but is all primer blue? What would cause these fittings to leak? And can I expect all of the rest of the joints in the house to start leaking as well???

not all primer is tinted. some is clear.
3 leaking joints is not a good sign but it neither does it signal there will be more.

Have you had recent earth quakes in PA? Did the Plumber specify what kine of joints were leaking? Were they on waste line or water lines? Did he open up the ceiling to verify what was leaking? You said PVC leaks so it was a large white pipe for waste, not PVC for water, correct? You need to put a guage on the line and isolate it and see if the pressure drops?



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Maybe a toilet flapper is leaking and causing condensation on the piping, and it's dripping off when it gets to a fitting....

Depending on the exact placement, I would lean towards water dripping from above and running down the pipe to where it is dripping. I won't speculate a guess without pictures or seeing it in person (which obviously isn't happening), but I find bad caulking almost every time that someone suspects a bad pvc joint or an odd shower leak.

No recent earthquakes. All three leaks are on waste pipe coming from two different bathrooms.

We wondered about condensation and water traveling along the pipe and dripping off at the joint. But when he cut open the ceiling, the rest of the pipe was dry and moisture was only found at the fitting. This was the case in all three spots.

Can you post some pictures?