Any annual rate increase will cause the bill to increase. Additionally, it is likely the new equipment will be more accurate in recording the volume of water used. Since older mechanical meters tend to lose accuracy as they age, they may not accurately measure all the water being used. All new meters are tested prior to delivery by the manufacturer to ensure that they register properly. If you see a higher usage than normal immediately upon the new meter installation and you have not changed your water use pattern, it is likely the old meter was running slow, or you have a minor leak in the system that wasn’t registering correctly through the old meter.