Stay out of the water. This is the message United Utilities is sending to members of the public.

The warning comes as the weather starts to get a little warmer, with people reminded the water's temperature does not rise as quickly.

While reservoirs may look inviting, they are extremely dangerous even in the summer months.

The water is so cold that it can cause cold water shock, immobilising your arms and legs, meaning you would be unable to swim and keep yourself afloat.

A spokesman for United Utilities said: “It is not just the cold water. Reservoirs are full of other hidden dangers. Keep yourself safe. We want to keep all visitors to our reservoirs safe.

“Deep water and steep sides, reservoirs are very deep with sudden drops and steep sides, making it difficult to get out.

“Strong currents caused by machinery under the water.

"Cold water shock can take your breath away and lead to panic and death – reservoirs are very cold.”