Drowning is the third most common cause of accidental deaths in children â€“ yet many schools in the county are not booking swimming lessons for their pupils.
It has led to criticism from the Amateur Swimming Association.
In an interview with the Derby Telegraph, Jon Glenn, head of youth and community at the ASA, said it was vital schools taught children how to swim.
He said: “The research shows 48% of 7-11 year olds in Derbyshire cannot swim 25 metres unaided. It’s shocking, quite frankly.