Locks were broken on a launch line sign at Telford Town Park, and two launch line boxes were completely removed at Tart Pool in Hinkshay.
The UK saw record high temperatures in parts of the country earlier this week – prompting more people to swim in rivers, lakes and streams – but putting life at greater risk.
And at least four people under the age of 17 have died in open water in the UK since Saturday, with the youngest confirmed as Robert Hattersley, 13, who struggled in the River Tyne near Ovingham, Northumberland.
Guy Williams, regional manager of Shropshire Fire and Rescue, said they were deeply disappointed with the behavior of the vandals.
He said: ‘At Telford and Wrekin lifesaving safety signs have been cut and some stupid idiots have decided to tear them down which is really disappointing.’
In addition to being on high alert for wildfires due to the weather, the fire department is concerned about the dangers posed by water.
“We have the problem of water security,” he added.
“The water is so cold it shocks people, no matter how good a swimmer you are.
“It’s always that cold temperature in the rivers, lakes and streams.
“And cold water doesn’t discriminate.
“So it’s a very important message to stay out of the water.”
If you see someone damaging the emergency ropes, you can report it online or call 101.