It may or may not be pressure. People often confuse pressure and volume. It is possible that the city is not supplying enough pressure. This can easily be checked with an inexpensive pressure gauge that can be connected to any hose connection. It is more likely you are not getting enough flow (volume). A couple of thoughts about volume. What kind of pipe is your house plumbed with? If it is galvanized, the pipes may be corroded nearly shut. Another possibility is you have a valve that is either partly closed or defective. I would make certain all valves are full on, including the meter.