Swimming at Hampstead Heath has become more expensive this month, with the City of London Corporation raising charges across the ponds and lido and reigniting fears among regular swimmers that the site is being pushed toward commercialization.

Adult single tickets now cost £5, up from £4.80. Concession tickets have risen to £3 from £2.90. A 12-month bathing ponds season ticket has increased from £150.50 to £157, while the combined lido and bathing pond year-long pass has jumped from £268 to £348, a rise of 29.85 percent.

The increase lands with particular force because Hampstead Heath has been run by the City of London Corporation since 1987, and the park’s open spaces have long been seen as part of London’s free natural inheritance. But the fee rise applies to the swimming facilities, not the Heath as a whole, and the corporation says most swimming charges moved in line with inflation.

A City spokesperson said the money goes directly into the costs of running the water sites, including staffing, lifeguarding, water-quality monitoring and upkeep. The corporation also said the wider Heath remains free to enjoy at no cost to taxpayers, and that the combined lido-and-pond season ticket provides multi-site access and 15 per cent savings for regular swimmers.

That reassurance has not calmed everyone. Swimmers speaking to Camden New Journal said they were worried the extra income could be used to bankroll other costs across the Heath, rather than just the ponds and lido. One regular, Papas Del Sol, said a 30 percent increase in one year left him extremely concerned and angry, adding that he feared the charge rises were a sign the Heath was being turned into a commercial enterprise that would shut out people who most benefit from outdoor swimming and contact with nature.

The dispute now sits inside a wider argument over what Hampstead Heath should become. The corporation’s plans for the future of the site include large-scale events, ticketed festivals, a padel court and more saunas, proposals that have helped harden the view among some swimmers that a modest price rise may not be the end of the story.

For now, the immediate question is not whether the ponds will stay open, but whether the people who use them most often will keep believing the fees are tied only to swimming. The City says the charges are there to preserve access and safety. The swimmers who bristled at this month’s increase clearly do not yet believe that is the whole truth.