How often should sprinklers be replaced?

How often sprinklers should be replaced depends on type, quality, usage, and maintenance, but generally sprinkler heads last 5 to 15 years before needing replacement, with average 10 years for quality heads. Spray heads may need replacement every 5 to 7 years due to wear, clogging, and damage from mowers, while rotor heads like Hunter PGP and Rain Bird 5000 can last 10 to 15 years or longer with proper care. Controllers last 10 to 15 years, though smart controllers may be replaced sooner for technology upgrades. Valves last 10 to 20 years. PVC pipes underground can last 20 to 40 years if not damaged. Factors that shorten lifespan include hard water causing mineral buildup, freezing without winterization causing cracks, lawn mower damage, and sun exposure degrading plastic. Signs you need replacement include uneven spray, leaking, heads not popping up, low pressure, and frequent clogging. Regular maintenance including cleaning filters, adjusting heads, and winterizing extends life, so inspect annually and replace heads as needed rather than on fixed schedule.