If you have your own well, then that tank Joe mentioned should be on YOUR property. Nobody should be fiddling with that to turn it off "by mistake". If there is one well for a subset of neighbors on one piece of land and somebody turned that off then it would be off for everybody unless the pressure valve and meter is close to the well for each individual house. If this is a community well ran by a company that you pay monthly for service, then they need to come out and find out why your pressure is so low. Everything Joe has said is under the assumption you have your OWN well on your own property. If this is a non-company owned community well you need to talk to your neighbors that all use this well for a plan of action.