Your home lawn, like any other plant, needs water to grow and remain healthy and in Idaho that means irrigation will be needed. Lawns that become water stressed take on a gray to purplish-green color. Foot-prints on the grass also become more obvious when grass is stressed. The amount of water to apply at any one time and how often to water depends on several factors including soil type, time of year or weather conditions and the type of grass. Remember to irrigate early in the morning to take advantage of reduced wind, reduced evaporative losses and usually reduced demand on municipal water systems.
A thorough discussion of how to properly water a lawn may be found in the UI bulletin, Water Home Lawns: How Much and How Often.