If you're thinking about landscaping your backyard, installing a wooden deck around your pool, or doing any other project that involves digging, remember to first call National Grid's 811 service. By calling this number, you confirm with National Grid that your digging will not interfere with power lines or pipe lines that are located close to the surface. 811 is a free service that helps keep you and your utilities safe and allows the area to enjoy its services uninterrupted.