Water can create suction in your pipes if there is a low pressure area somewhere. Typically there would have to be a broken section someplace thats drawing water, or a toilet thats syphoning into the tank. This would mean, you don't have much pressure in your pipes. It also happens when a fire truck hooks up to a fire hydrant. Since the fire trucks pump water out greater than the pressure in the line, it creates a negative pressure. The negative pressure will suck water up a line where the faucet normally drips. A dripping faucet is a location for the water to pass by the rubber seals inside the faucet meant to stop the flow. You can get the same situation if someone on the line has a pressure booster system for a high rise building. Since the booster pump can pump water from the line faster than the water can flow, it will create a negative pressure on the main line in the street. If you are close enough, when the pump kicks in, you will have a negative pressure at your faucet. Fixing the bad gaskets and seals will prevent water from reversing up into the supply pipes, but the negative pressure will still exist. Talk to the city about this one, its something they should know.