Water can appear cloudy and/or rusty whenever there is a large draw of water from the water main. This can occur when water valves are opened and closed, when there are water main breaks, and when hydrants are flushed or used by the Fire Department.
Discolored water is usually temporary, and while unappealing, it is not harmful.
If your water is cloudy or discolored, run the cold water faucet closest to the meter (usually located in the basement or outside hose bib) for 5 minutes. If the water is not clear after 5 minutes, the issue causing the discoloration may still be occurring, so water should be turned off. Allow the sediment in the lines to rest for at least 30mins before repeat attempts at running the water can be made.
Please avoid using any hot water as sediment that enters your hot water tank will take longer to clear out.