The supply of spa water to Cheltenham's historic pump rooms could be switched back on this autumn.
Underground leaks were found at the rooms in November 2003
Engineers said they had resolved the technical difficulties which delayed the completion of restoration works.
Underground leaks were found in the main well of the pump rooms in November 2003, allowing ground water to seep in.
The remaining works include provision of new pumps and pipes, repairs to the wells and a UV water sterilisation system to comply with regulations.
Roger Crabb, from the project sponsors, Kohler Mira, said: "We have approved the programme for the outstanding works and there will also be funds for restoration and cleaning of the spa water fountain."
Borough councillor Rowena Hay added: "This is good news for Cheltenham. The water has been unavailable for two years now and its restoration is eagerly awaited."
Plans are now being made to launch the newly-restored spa water supply during National Spas Week in September.