Installing aerators and low flow fixtures require an initial investment, but they often pay back their initial cost quickly. Check with your local municipality for rebates and incentives to make the switch. Toilet flushing alone accounts for 30% of water use in commercial buildings, so upgrading to a low flow toilet can result in significant savings. Go one step further and upgrade to dual-flush toilets to save even more money and water. Additionally, try landscaping with native plants, which require less watering.