Phase 4 involves construction of the Pajarito Pump Station, which installed booster pumps to convey water to the Pajarito Reservoir. The reservoir sits at an elevation of 5,155 feet while the pump station has an existing elevation of 4,915 feet. This phase increases water capacity for future expansion.

Phase 5 installs approximately 50,000 feet of distribution waterline and 333 water services east of Coors Blvd. and west of the Rio Grande River between Raymac Rd and Cherry Tree Lane and Cherry Tree Court.