Most Calderdale schools are improving but a growing number are inadequate, according to Ofsted.
One school fell into that category in 2009 but the number has risen steadily to seven this year.
The number classed as satisfactory has slipped from 35 to 25 and there are now 21 outstanding schools, compared to 19 four years ago.
Ofsted inspection reports show that behaviour in some schools has been deteriorating, down from 47 in the outstanding category to 37. But the effectiveness of school leaders has risen since 2009 and so has the quality of teaching. In three schools teaching is classed as inadequate.
The number of schools in the top category of achievement has gone up from 16 to 20 but the number of schools where achievement is inadequate has also risen alarmingly from one in 2009 to six this year.
Access to a good education is “far too dependent on where you happen to live”, said Ofsted’s chief inspector Sir Michael Wilshaw.