Only run the dishwasher with a full load. Running the dishwasher multiple times for smaller loads will cause twice as much water to be used. Dishwashers also use less water per load than it would require for you to wash them by hand.
If you wash your dishes by hand, fill one side of the sink with fresh water and use it for rinsing when the dishes are scrubbed clean, rather than rinsing each plate, cup, or utensil individually.
Install a water aerator on your kitchen faucet. An aerator allows the water pressure to remain the same but can help to reduce water use by as much as one full gallon every minute.
Keep a large pitcher of water in the refrigerator for use whenever you need cold water. This will eliminate the need to run the sink and wait for the water to get cold.
In the bathroom:
Consider getting a low-flow shower head in your bathroom. A low-flow shower head can reduce water use every time you shower without having to sacrifice water pressure.
Check to make sure the parts inside your toilet tank are in good shape and up to date. Worn-out fittings or chains can cause the toilet to run unnecessarily. Many new models of high-efficiency toilets work just as well without using as much water, so consider upgrading.
Never allow the water to run while you are brushing your teeth.
Only fill your bathtub halfway instead of all the way to the top. Once you get into the bath, the water should rise to a comfortable level.
Rinse razors in the sink with about one inch of water instead of rinsing them under a running stream from the faucet.
Take shorter showers whenever possible.
Repair leaky shower faucets and valves.
Other indoor water conservation ideas:
Check to make sure all of your pipes are properly insulated. It can take longer for water to heat up if your pipes are not insulated, which results in the water running for much longer periods of time. You may also cover your hot water heater with a special insulating blanket or cover.
Look for leaks regularly throughout your home. Check under all sinks and under crawl spaces, and be sure to learn how to check and read your water meter.
Switch to more energy-efficient appliances, like washing machines that load from the front. Front-loading machines use much less water than top-loading washing machines and work just as well to get your clothes clean.
When you wash fresh produce, re-use that same water for your houseplants rather than filling up a watering can.
Water your lawn and garden as early in the morning as possible. This will prevent the water from evaporating as quickly and result in the need for less watering in general.
Put automatic water sprinklers on a timer and make sure they are pointing only at areas where plants will be watered.
Look for drought-resistant plants that can live throughout the year. These hardy plants often rely on their own water reserves and don’t need to be directly watered as often as other species.
Place a layer of mulch around your flower bed and garden and under shrubs and trees You can also find a local landscaper to help. Mulch looks nice and helps keep water from evaporating as quickly, and ensures that the water is getting down to the roots.
When it comes to washing your car, use a bucket filled with soap and water and a sponge rather than running the hose the entire time. You can repeat this by filling the bucket with clean water when you’re ready to rinse.
Consider using a rain barrel to catch water to help nourish your outdoor plants. These special containers harvest rain quickly and will prevent you from using a hose or sprinkler system as often.