The answer to 'my water line replacement is leaking' is that there could be several common causes, including improper installation, damage to the new pipe, or issues with the connections. Symptoms may include visible leaks, wet spots on the ground, or decreased water pressure. To fix the issue, you'll need to identify and address the root cause.
If the leak is minor, you may be able to DIY the repair by tightening fittings or applying sealant. However, for more significant leaks or if you're unsure of the cause, it's best to call a professional plumber. They can properly diagnose the problem and make the necessary repairs to ensure your new water line is functioning properly and preventing further leaks.