Drip problems announce themselves if you know the signs: one plant dying while its neighbors thrive, soggy spots or geysers in the rock, a water bill that jumped for no reason, or a timer that runs on mystery settings the last owner programmed. Old polyline also gets brittle after years of Arizona sun and starts splitting. If your system is over ten years old and you're patching it every month, drip irrigation repair often costs less than the water you're losing.