Locate your meter box, generally found toward the front of a property, near the street. The box is typically in the direct line with the main outside faucet. It is housed in a meter box usually marked "water". Remove the lid by using a tool such as a large screwdriver, insert the tool into one of the holes and pry the lid off.
Once you open the meter box lid, lift the protective cap on the meter. On the face of the meter, there is a large dial and a display of numbers. For the residential meter, each rotation of the dial measures 10 gallons. Read the number display from left to right. The stationary zero on the meter is printed where the reading is placed on the bill. Meters measure water in gallons. Charges fro the amount of water consumed are rounded to the nearest 100 gallons of water used during a billing period. Compare that reading to what your bill states as present reading. This number will give you the amount of water used since the last reading.