Sprinkler System Spring Startup: A Homeowner's Guide

As the last frost thaws, the first thought for many homeowners is reviving a lush, green lawn. But turning on your irrigation system after a long winter is a delicate process. A single 1/8-inch crack in a PVC pipe, if left unchecked after a faulty startup, can waste over 2,500 gallons of water in a single day, leading to a massive water bill and potential landscape damage. Proper spring startup is a critical maintenance hub task that prevents costly repairs and ensures your system operates efficiently all season.

This guide is for homeowners with an established in-ground irrigation system, particularly those in homes 5-20 years old. It's for the owner who is weighing the pros and cons of performing their own sprinkler activation for the first time versus hiring a professional. If you're staring at your irrigation controller and backflow preventer wondering, "What now?" this is for you.

The single biggest mistake a homeowner can make is heading to the main valve and cranking it open. This action can unleash a phenomenon called "water hammer"—a high-pressure surge or shockwave that travels through the pipes. After sitting empty all winter, the pipes are filled with air. Introducing high-pressure water too quickly causes this air to compress and then violently expand, creating a powerful surge that can crack fittings, burst pipes, and damage sprinkler heads. A careful, slow, and methodical startup is the only way to prevent this thousands-of-dollars headache and is a cornerstone of understanding your home systems guide .