The answer to 'how often to irrigation system' is that most irrigation systems should be inspected and maintained at least once or twice per year. This helps ensure the system is operating efficiently and catching any issues before they become major problems. Proper maintenance typically involves checking for leaks, adjusting sprinkler heads, cleaning filters, and programming the controller to water at the optimal times.
Depending on the climate, age of the system, and usage, some irrigation systems may need more frequent attention, such as monthly or quarterly inspections. It's best to consult with a professional landscaper or irrigation specialist to determine the right maintenance schedule for your specific system and property.