Children under 12 and an accompanying adult would be allowed free entry to the new Pontypridd Lido if plans to regenerate the old leisure centre are approved.
Rhondda Cynon Taff Council's announcement comes a week after Heritage Lottery Fund confirmed it would invest £2.3 million in the Pontypridd Lido project.
The Council is seeking further funding to make up the shortfall in the £6.2 million redevelopment.
New plans for the Lido include three heated pools, a café, visitor’s centre, viewing gallery,and a new changing block.
More top news
Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Sunny and bright spells for most of us this afternoon, feeling pleasantly warm.
North Wales Fire and Rescue Service say incidents of deliberate fires are more common during the school holidays.