The answer to 'why is my water line rusty water' is that the water line has likely developed rust over time, causing the water to appear discolored. This is a common issue that can be caused by several factors, including the age of the plumbing system, the quality of the water, and the material used in the water line.
Rusty water can be a sign of corrosion in the water line, which can lead to further problems if left unaddressed. Symptoms of a rusty water line may include reddish-brown or yellowish water, a metallic taste, and staining of fixtures and laundry. In some cases, the rusty water may also contain sediment or particles.