10abb172_unicipal_well_and_pump_service__HOW_TO_CORRECT
[CAUSE OF TROUBLE] 2. Low line voltage [HOW TO CHECK] Use voltmeter to check pressure switch or terminals nearest to the pump. [HOW TO CORRECT] 
If voltage is under the recommended minimum, check the wiring from the main switch on the property. If OK, contact the power company.
Troubleshooting Submersible and Jet Pumps - Earl Pruitt's Residential - Municipal well and pump service
HOW TO CORRECT