Narrative:

Took off and leveled. 45 mins after takeoff, the purser called the aft gallery area and explained we only had 3 gallons of water on aircraft. 5-10 mins later, she told us that we could be landing in ord for water. About 10 mins later, the cockpit called us and said we would be landing. We had 2 1/2 hours to ord. They had to dump fuel. We decided to do the meal and beverage service. Completed the services and landed. No one got off. Mechanics came on and closed off the lavatory 2L. Water was then put on and refueled. We were given 297 gallons of water. Continued to lhr. Callback conversation with reporter revealed the following information: the reporter stated the water tanks were svced at the departure station and the service slip was delivered to the cockpit. The reporter said en route the tanks were checked and found to be almost empty and the decision was made to land at ord for water service. The reporter stated at ord the tanks were svced and 2 aft lavatories were taken OTS for leaking.

Google
 

Original NASA ASRS Text

Title: A B-777 IN CRUISE ON OVERWATER OP DUMPED FUEL AND DIVERTED DUE TO NO WATER IN POTABLE WATER TANKS.

Narrative: TOOK OFF AND LEVELED. 45 MINS AFTER TKOF, THE PURSER CALLED THE AFT GALLERY AREA AND EXPLAINED WE ONLY HAD 3 GALLONS OF WATER ON ACFT. 5-10 MINS LATER, SHE TOLD US THAT WE COULD BE LNDG IN ORD FOR WATER. ABOUT 10 MINS LATER, THE COCKPIT CALLED US AND SAID WE WOULD BE LNDG. WE HAD 2 1/2 HRS TO ORD. THEY HAD TO DUMP FUEL. WE DECIDED TO DO THE MEAL AND BEVERAGE SVC. COMPLETED THE SVCS AND LANDED. NO ONE GOT OFF. MECHS CAME ON AND CLOSED OFF THE LAVATORY 2L. WATER WAS THEN PUT ON AND REFUELED. WE WERE GIVEN 297 GALLONS OF WATER. CONTINUED TO LHR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE WATER TANKS WERE SVCED AT THE DEP STATION AND THE SVC SLIP WAS DELIVERED TO THE COCKPIT. THE RPTR SAID ENRTE THE TANKS WERE CHKED AND FOUND TO BE ALMOST EMPTY AND THE DECISION WAS MADE TO LAND AT ORD FOR WATER SVC. THE RPTR STATED AT ORD THE TANKS WERE SVCED AND 2 AFT LAVATORIES WERE TAKEN OTS FOR LEAKING.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.