Education Secretary Michael Gove has criticised the standard of Lancashire's primary schools, saying they are not good enough and urgent action must be taken.
He made the comments in a letter to the MPs of Lancashire.
Last year 32 primary schools in the county had results that fell below the standard required, with 16 of them being substandard for at least two of the last four years.
On a visit to Lancashire in July the Schools Commissioner for England, Dr Elizabeth Sidwell, said more primary schools in the local authority area needed to raise their standards.
A Department for Education spokesman said: "Standards in this hard core of primary schools must be addressed. We are clear that Academies are the best way to drive school improvement."