One thing to think about is your toilet(s). New toilets use far less water for flushing: 1.6 gallons, as opposed to as much as 5 gallons for older models! (We have really old toilets in our house and replacing them is high on the home improvement list) For instant water reduction, you can drop a small weight into the tank to displace some of the water -reducing the amount needed to refill the tank after each flush. A brick works great. Toilets can also leak from the tank -adding to water loss. Add a small amount of food coloring to your tank. If the food coloring finds its way into the bowl, you've got a leak. Check with a handyperson or plumber about fixing one of those.
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