Locate your water meter. Contact the local public utilities company to find out where your meter is if you are having a hard time locating it. Normally the meter will be in the ground with a metal cover or box near one of the sides of your house.
Record the numbers from the meter. Wait 24 hours and record the numbers again. Subtract the second number from the original number to get the exact cubic feet of water that was used in one day. Your water usage will be given in cubic feet.
Record these numbers for several days to get the most accurate average. Try to get your numbers at the same time every day.
Convert the number to gallons by multiplying the average daily cubic feet by 748. Divide the number of gallons used by the number of people in your household. This will give you the average number of gallons per person. Compare this number with the national average.
Use this number to adjust the amount of water you use.