The splash park reopened on July 19 following the Covid-19 lockdowns, but Peterborough City Council confirmed today that a failure in the water treatment system meant it had to close once again.
A spokesperson for the council said: "We have contacted a contractor to repair this and the system will be replaced as soon as possible.
"In the meantime, the splash park will not be safe to use and will remain closed."
Conservative councillor for Bretton Chris Burbage said on his social media that the repair could take "several days".
The park did open this morning, July 22, but was closed before 1pm.