The answer to 'water line replacement slow draining' is that a slow draining issue after a water line replacement is often caused by improper installation or debris left in the pipes. This can lead to clogged or restricted water flow, resulting in slow drainage.
Some common causes include: incorrect pipe sizing, incorrect pipe angle or slope, debris left in the pipes during installation, or a problem with the new plumbing fixtures. To resolve the issue, you may need to have a professional plumber inspect the work, clear any blockages, and make adjustments to the new water line installation.