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The current standard for a stairway in a public building is a tread that is no less then 12" deep (this can include a rounded nosing) with a rise of no more the 7". The tread should overhang the place where the previous step joins the riser by 1".
This is for new work. If you're making a repair or renovating a residential structure, there may be allowances. Check with the local building inspector.

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