Sprinkler systems are often install-it and forget-it, few people give thought to maintenance or sprinkler systems beyond leak detection and repair. There are a couple of good reasons you should look at upgrading sprinkler heads periodically. Especially if your system was installed 8 or more years ago. In the western US where news of the historic drought has inundated us over the past few years, drastic steps are often taken when simple upgrades and repairs would suffice. It has gotten to the point California is naming and shaming big water wasters.