Elk River grew up around moving water — the town's dam once slowed its namesake river into a working pond — so it fits that Restorff Irrigation & Lawn LLC treats water as the heart of lawn care. On July mornings the sprinkler heads rise at dawn, throwing their arcs before the heat arrives, because the ground here drains quickly and a lawn lives or dies by its watering. Restorff handles both halves of the equation: irrigation kept running the way it should, and the mowing and trimming that turn all that water into an even green result. A well-watered lawn in a dry stretch of summer is a quiet kind of luxury. Making it ordinary is the company's trade.