The answer to 'why is my pipe rusty water' is that your pipes are likely corroding, causing rust and discoloration in the water. This is a common issue, especially in older homes with metal pipes.
The most common causes of rusty water are oxidation and mineral buildup inside the pipes over time. This can happen with both galvanized steel and copper pipes. Factors like water chemistry, pipe material, and age can all contribute to the problem. Symptoms include reddish-brown or yellow-tinged water, a metallic taste, and staining of fixtures and laundry.