With wind turbines comes the issue of noise, but that doesn't mean that the windmills are going to be loud. In fact, the windmills are metered and proven not to exceed 55 decibels on the A scale. That simply means the sound lies somewhere between the noise of a Quiet Suburban area and the noise of an ordinary conversation.
The noise generated by a wind turbine is not meant be loud enough to disturb the peace of those who live around them. So rest assured, there are ordinances that prevent the sound from getting too loud.
Although 55 decibles is loud enough to hear day to day, the sound is lessened by the distance away you are from the windmill. No house is going to be built two feet from a wind turbine, so you'll never have to worry about getting the full 55 decibels. Also, because 55 decibels is the limit the sound emitted is likely be less than that. The most people usually hear from a wind turbine is a slight humming sound.
Check out This Site to learn more about the decibel scale and the physics of noise.