The answer to 'septic tank rusty water' is that rusty water in a septic tank is often caused by the corrosion of the tank's metal components. This can be a sign of an older septic system that needs maintenance or replacement. Symptoms include discolored water, staining around the tank, and foul odors.
In many cases, the rusty water is not a major issue and can be addressed through regular septic tank pumping and inspection. However, if the corrosion is severe, it may require replacing the septic tank or certain components. This is best handled by a professional plumber or septic service technician, as they can properly assess the system and make the necessary repairs or replacements.