Welcome to O'Keefe Landscape Irrigation, a professional, friendly and reliable Architectural & Engineering Services in Merrimack dedicated to providing high quality Architectural & Engineering Services for commercial and domestic clients throughout New Hampshire. The O'Keefe Landscape Irrigation offers professional workmanship, competitive prices and high quality service delivered on time and within budget. O'Keefe Landscape Irrigation, which is located at Merrimack,New Hampshire, was set-up in 1996.