The answer to 'what is water line replacement' is replacing the main water supply line that brings water into your home from the municipal water source or well. This is typically done when the existing water line is leaking, damaged, or no longer adequate for your home's water needs.
Water line replacement involves digging a trench from the home's main water shut-off valve to the property line where the municipal water line is located. The old pipe is removed and a new, larger-diameter pipe is installed in its place. This provides a fresh, reliable water supply to the home. The process can take 1-3 days depending on the length of the line and any obstacles encountered.