B737-300 FLT CREW RPT OPERATING 3 FLTS WITH WATER LEAKING FROM OVERHEAD AT ROW 12. AT FLT TERMINATION; WROTE LOG RPT FOR CONTRACT MAINT TO INVESTIGATE.

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WE WERE TAXIING OUT FOR TKOF WHEN THE FLT ATTENDANTS CALLED THE COCKPIT AND SAID THERE APPEARED TO BE WATER LEAKING FROM THE OVERHEAD BIN AREA AROUND ROW 12. THE BIN AREAS WERE SEARCHED AND NO ITEMS THAT WERE LEAKING WERE FOUND. WE HAD FLOWN THE ACFT 2 PREVIOUS LEGS AND THE FLT ATTENDANTS HAD NOTICED CONDENSATION LEAKING FROM SOME OF THE OVERHEAD VENTS. I ASSUMED THIS WAS ANOTHER CONDENSATION LEAK. WE HAD 1 OPEN SEAT ON THE ACFT. I STOPPED THE ACFT AND FOLKS WERE MOVED SO THAT THE SEAT IN THE AFFECTED AREA WAS NOT AN ISSUE. WE PROCEEDED AND ON DSCNT INTO ZZZ1 THE FLT ATTENDANTS CALLED THE COCKPIT AGAIN AND SAID THERE WAS A LOT OF WATER LEAKING FROM THE OVERHEAD AREA ON BOTH SIDES OF ROW 12. THIS WATER GOT SOME OF OUR PAX WET AND THEY WERE NOT HAPPY. UPON ARR; I CONTACTED DISPATCH AND MAINT AND WE DECIDED TO HAVE THE ACFT INSPECTED BY CONTRACT MAINT. WE WERE HAVING A CREW CHANGE SO I BRIEFED THE ONCOMING CAPT ABOUT THE PROB. IN HINDSIGHT; I COULD HAVE HANDLED THE SITUATION BETTER BY EITHER STOPPING THE ACFT AND GOING BACK INTO THE CABIN TO SEE THE PROB MYSELF; OR I COULD HAVE RETURNED TO THE GATE FOR MAINT TO LOOK AT THE PROB. I ASSUMED THIS WAS A CONDENSATION LEAK AND DIDN'T REALIZE HOW BIG THIS LEAK WAS GOING TO TURN INTO AND MAYBE COULD HAVE PREVENTED SOME OF OUR PAX FROM GETTING WET. SUPPLEMENTAL INFO FROM ACN 702934: WHILE ON TAXI OUT WE WERE INFORMED BY A FLT ATTENDANT THAT WATER WAS LEAKING ON A PAX. WE STOPPED AND ASKED ABOUT THE RATE OF FLOW AND IF THE LEAK WAS ISOLATED TO ONE AREA. WE WERE INFORMED THAT THE FLOW WAS DECREASING AND THAT THE PAX COULD BE MOVED TO ANOTHER SEAT THAT WAS VACATED BY MOVING AN EXTRA FLT ATTENDANT TO THE 4TH SEAT. THE PAX SAID THIS WAS SATISFACTORY AND THAT THEY DID NOT WANT TO GO BACK TO THE GATE. ENRTE WE WERE INFORMED THAT THE FLOW HAD BEGAN AGAIN AND NOW IT WAS WORSE. WE WERE NOT FAR FROM OUR DEST SO WE CONTINUED TO AN UNEVENTFUL LNDG. AT OUR DEST THE CAPT INFORMED THE FOLLOW-ON CREW OF THE PROB AND CONTACTED MAINT. I THINK THE PROB WAS CAUSED BY A CLOGGED FILTER THAT 'LET LOOSE' RESULTING IN THE FLOW OF WATER.