How often should you flush a water heater in Las Vegas?

At minimum, once per year. Las Vegas water at 16–22 GPG is among the hardest in the country, and mineral sediment accumulates faster here than in most cities. Homes without a water softener may benefit from flushing every 6 months. If you hear rumbling or popping sounds from your water heater, that’s accumulated sediment — flush it as soon as possible regardless of the schedule.