Efficient washing machines can save up to 20 gallons per load. These also save on energy. If you are replacing laundry facilities, don't even consider anything but the new horizontal axis models. These not only save up to 40% of water used, but deliver even more substantial energy savings - up to 65%.
Water boilers also require blow-down, or bleed-off, just like air conditioners. Monitor total dissolved solids, and blow down only when necessary.
Avoid excessive filter or softener back flush. Back flush only when needed.