Q. Are there any specific metrics that I should look at to gauge efficiency of a pumping system? A. While pump tests are the best indicators of pump efficiency, this information can be insufficient while dealing with a water distribution system. One of the indicators that can be used in these cases is total energy consumption per unit volume of water pumped. This metric is usually expressed as kWh/Acre Foot. This metric is very easy to keep track of since kWh and Acre Feet numbers are readily available. These numbers can be obtained without the need for specialized testing or equipment. For the CA region, well pumping falls within 700-1400 kWh/MG range. This is a rather wide range. There are a lot of factors which will influence system efficiency. Please consult with your local energy expert for further details.