Glenbrook Swim Centre opened one week earlier than scheduled this week, following remediation works to the outdoor pool shell.
Council's seasonal pools will open throughout the coming months, with all being ready for swimmers in time for summer.
"I congratulate council staff on exceeding their project target for Glenbrook Swim Centre. Glenbrook pool is such a popular community asset," said Blue Mountains mayor, Mark Greenhill.
Councillor Brendan Christie, also representing Ward 4 in the Blue Mountains, said: "It's wonderful that Blue Mountains residents and visitors are able to start swimming and enjoying themselves earlier than expected at Glenbrook. This is a great facility and I already know families who have jumped at the opportunity to use it this season."
The opening follows council's commitment to extend pool opening hours during heatwaves this summer.
For information on extended pool opening hours, during summer heatwaves go to bmcc.nsw.gov.au/Media-Centre
Glenbrook will operate under its winter hours until Monday, September 30 and then begin summer hours.
Lawson Swim Centre will open on Saturday, September 28; Katoomba Leisure Centre's outdoor pool will open on Saturday, October 5; and Blackheath Pool on Saturday, November 2.
For more details on the five swim centres operated by Blue Mountains City Council go to: bmcc.nsw.gov.au/LeisureCentres.