The answer to 'how to fix water line replacement' is to replace the damaged or leaking water line. This typically involves digging up the old line, turning off the water supply, cutting and removing the damaged section, and installing a new section of pipe. Proper safety precautions, such as marking underground utilities and wearing protective gear, are essential throughout the process.
The frequency for water line replacement depends on the material and age of the existing line, as well as local soil and climate conditions. Most water lines last 50-100 years, but problems can arise sooner due to freezing, corrosion, or other factors. If you suspect a water line issue, it's best to have a professional plumber inspect it and provide recommendations.