The term used for water that has a high concentration of particulate iron due to corrosion products is:

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Red water describes water that has a noticeable red, rusty, or orange color caused by suspended iron particles from corrosion products in the distribution system. When iron from pipes or service lines is disturbed or released, these particulates circulate and discolor the water, giving it that reddish hue. It’s mainly an aesthetic issue and can stain laundry and fixtures, but it doesn’t necessarily indicate a health risk. This term is more specific than cloudy water (which refers to general turbidity from various solids) or colored water (which could be any color), and it’s distinct from clear water (which has little to no color). If red water occurs, flushing the lines or addressing iron removal can help restore normal appearance.