This is Kentucky Bluegrass, the ubiquitous turf grass covering much of the country, including the arid west. And while Kentucky bluegrass in general has a bad rap as a water-hoggish turf grass, it has two things going in its favor: nothing covers a playfield as efficiently or repairs as quickly as bluegrass; and two, a lot of research is taking place around Kentucky bluegrass and its kin to develop varieties that are slower growing, less water-needy, more salt tolerant, and generally better suited to the arid west. If you aren't using a space where it is planted, maybe give another palatte a thought, but at the least, water bluegrass as efficiently as possible following the guidelines provided to minimize over-watering and water waste.
It may seem odd to include this in a list of water-wise plants, but Kentucky bluegrass is habitually and unnecessarily over-watered. Mowing higher (3 to 4 inches) reduces water demand, as does controlling weeds and reducing dependence on synthetic fertilizers. See the Guide for the proper care and feeding of this much-maligned plant.