To fix a leaking shower valve water line connection, follow these steps: First, shut off the water supply to the house or bathroom. Next, disconnect the supply lines from the valve using a wrench. Inspect the valve for corrosion, cracks, or worn-out parts like O-rings or seals. Replace damaged components with new ones matching the valve model. Reconnect the lines, turn the water back on, and test for leaks by running the shower. If the leak persists, consult a professional to check for hidden issues like pipe misalignment or faulty valve installation.

The process addresses common causes of leaks, such as worn seals or pipe corrosion. According to the American Water Works Association, 15% of household water leaks originate from faulty plumbing fixtures, with shower valves accounting for 8% of these cases. O-rings and seals, which cost $5–$20 each, are the most frequent failure points, as they degrade due to mineral buildup and pressure changes (Plumbing Foundation, 2022). Replacing these parts resolves 70% of leaks, per DIY plumbing statistics. However, 30% of leaks stem from deeper issues like pipe corrosion or improper installation, necessitating professional evaluation. A study by the Environmental Protection Agency found that DIY repairs save homeowners 50–70% on labor costs but require precision to avoid exacerbating the problem. Neglecting steps like shutting off water risks property damage, as a single gallon of water can ruin $1,500 worth of flooring (HomeAdvisor, 2023). Thus, methodical inspection and part replacement are critical to ensuring long-term functionality and cost savings.