Watering your lawn is essential to keep it healthy and looking good. We recommend watering weekly, between Spring and mid Autumn, to fill a rain gauge or container to 2.5cm (1 inch depth), which is about 1m3 of water. Find out the cost of watering your lawn using our handy tool. Its not as much as you think and for a 100m2 lawn the price of a cup of coffee! Our customers typically have either Sutton & East Surrey Water or Southern Water.