The answer to 'shut-off valve rusty water' is that a rusty shut-off valve is a common plumbing issue that can cause discolored, rust-colored water. This is typically caused by corrosion or mineral buildup inside the valve over time. Symptoms include difficulty turning the valve, leaks, and rusty water flow.
In many cases, the shut-off valve can be repaired or replaced to resolve the issue. However, if the problem is more widespread throughout the plumbing system, it may indicate a larger issue that requires professional diagnosis and repair. It's generally best to call a licensed plumber to properly inspect and fix a rusty shut-off valve, as they have the tools and expertise to do the job safely and effectively.