sentences:  In Washington County, the highest tax relief went to Washington School District at $407 in 2009 and $414 in 2010.In Allegheny County, the highest property tax relief in 2009 was awarded to the approved property owners in Duquesne City School District at $346.The greatest tax relief in the Commonwealth of Pennsylvania was given to Chester Upland School District of Delaware County set at $632 in 2009 and $641 in 2010.