Ofsted has branded the council's efforts to support and challenge weaker schools as "ineffective".
It follows a recent five day inspection in the county. Ofsted claims there was a "legacy of under achievement", because the council had been too slow to intervene.
The Chief Inspector even went onto say the complacency had "denied tens of thousands of children the chance of a decent education".
More top news
A health and safety prosecution against a hospitality company has been dropped after two people drowned in a hotel pool in Hatfield Heath
Six jewel thieves who raided a shop in Norwich have been sentenced. Police caught the men after a dramatic helicopter chase.
Police have released pictures of Pauline King, 82, on her last trip to the shops before she was murdered at her own home