The girls disappeared while allegedly cooling off in a river at Fatfield, Tyne and Wear in celebration of the school holidays.
More than 100 emergency workers were involved in a search for the girls before sadly their bodies were recovered.
Their deaths follow the drowning of a teenage boy in a lake in a quarry in the Malvern Hills and a 21 year old man who was rescued from Coniston Water in Cumbria but died in hospital.
And a teenage girl had to be rescued from a weir in a park in Greater Manchester after jumping into a river.
Head of Risk Reduction Glynn Luznyj said: “This latest incident shows the dangers of swimming in rivers, likes, quarries and other unsupervised places. Our thoughts are with the family and friends of these girls and with everyone involved in the rescue attempts and search. It was a very tragic outcome.”
He added: “It is extremely tempting when the weather is hot and sunny and people are perhaps in holiday mood to take a cooling dip in the water – but they put themselves at great risk.
“Underwater currents and debris and cold water temperatures can quickly result in even strong swimmers getting into difficulty. All too often this leads to the drowning of the swimmer and their would-be rescuer.
“We urge parents to warn their children and teenagers of the dangers of playing in water, particularly as the school holidays are now upon us, and to tell them that under no circumstance should they swim or jump into ponds, lakes, rivers or other areas of unsupervised water. This advice could save their lives.”
For more information on water safety visit www.staffordshirefire.gov.uk