The Vale of Glamorgan council is the latest to fall foul of the education watchdog in this recent round of inspections in Wales.
Currently five local education authorities have been deemed “good”, six “unsatisfactory” and nine “adequate”.
A report on Swansea is due at the end of this month while the final of the 22 reports will be published next year.
In the latest assessment of education services in Wales, Estyn said the Vale of Glamorgan did not evaluate provision and leadership in schools well enough and relied too heavily on performance data to categorise schools.
It added that it had failed to address recommendations from its previous inspection three years ago and benchmarked performance in all key stages was weaker in 2012 than it had previously been.
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