The answer to 'irrigation system thin grass' is that thin, sparse grass around irrigation system components is often caused by overwatering or leaks in the system. Symptoms include wet, soggy soil and patchy, discolored grass around sprinkler heads, valves, and pipes. The solution may involve adjusting the irrigation schedule, repairing leaks, or improving drainage in the affected areas.
In many cases, the homeowner can troubleshoot and fix minor irrigation system issues themselves. However, more complex problems like malfunctioning components or system-wide imbalances may require the expertise of a professional landscaping or irrigation contractor.