What is the maximum riser height of a pool step that you would suggest?

"Riser height" is the vertical distance from one step to the next.

I believe in-house stairs are generally on the order of 7-1/2" or so, but, if I'm not mistaken, pool steps typically have a greater drop to them.

Is 12" too much? How about 10"?

No one with a physical disability is going to use the pool very often, if that makes a difference.

Thanks ever so much.