Except for the bottom riser, risers at the centerline shall have a maximum uniform height of 9 inches (229 mm). The bottom riser height shall be permitted to vary from the other risers.
The vertical distance from the pool coping, deck, or step surface to the uppermost tread shall be not greater than 9 inches (229 mm).
The leading edge of all steps shall be distinguished by a color contrasting with the color of the steps and the pool floor.
Stairs that are located in water depth greater than 48 inches (1219 mm) shall have the lowest tread located below the deck at a distance of not less than 48 inches (1219 mm) below the deck.
Treads shall have a unobstructed horizontal depth of not less than 11 inches (279 mm).
Treads shall have an unobstructed surface area of not less than 240 square inches (.017 m2).