I assume that you have measured the actual water pressure at the supply mains…Acceptable pressures range from 30-80 psi. If the water company is supplying less than 30 psi, you have a cause for complaint, and you and your neighbors should demand a fix.
If the pressure supplied to your house is acceptable and you still have low pressure problems in your house, then the problem is in your own pipes. Most often this is do to inadequately sized pipes or occluded pipes. If you (and your neighbors) have adequately sized but greater than 40-year-old galvanized pipes, the most likely problem is sludge and scale in your pipes. The only good way to fix that problem is to replace the old pipes with copper.