When water looks milky or cloudy when pouring from the faucet, it is likely due to air being released from the water. This mostly happens in the winter and is usually noticed more in the hot water.
Water from lake and river sources holds more oxygen in winter months because the water is cold and air is more soluble in cold water. Similar to soda, when the water is warmed up it will release the air more readily. As water travels from the treatment plant where it is fresh, cold and under pressure from the pumps sending it to the system of pipes throughout the community, it holds most of the air trapped in the water.
Upon entering your home it warms up (especially if it goes to the hot water system). When drawing the water from the faucet, the pressure is reduced and air is released, similar to opening a bottle of soda. This will look like milky water and if you let it set for a few minutes, the air rises to the top and oxygen is released into the atmosphere.
There is no reason for concern and you can use your water as you normally would.
Air can get trapped in your home plumbing and will find its way to the highest points in the plumbing as air rises. Starting with the cold water, from the lowest level of your building and working up to the top floors, flush the sink faucets, showers, and utility sinks. It is helpful to remove the aerators on the ends of the sink faucets when flushing, if present. It is also helpful to run the water as hard as possible without causing the sink to overflow. Trapped air can take a few days to work its way out but regular use should help.