Where stairs are provided, they must be equipped with a handrail, have walking surfaces and treads that are of nonslip design with the leading edge in contrasting color, have steps with a minimum tread of twelve (12) inches and a maximum rise of ten (10) inches, and have no abrupt drop-off or submerged projections into the pool, unless guarded by handrails.
Idaho Admin. Code r. 16.02.14.122