At A1 we specialize in the installation, maintenance, and repair of septic systems. A1 can also fulfill all your excavating needs. Serving the Southern Maryland counties of Calvert, Charles, St. Marys and Prince Georges. Have a septic need, A1 can help. Whether your need is for a perc test, septic certification, tank installation, drain field replacement, or high pressure line jetting. From perc test application to final grade and seed, we handle it all. We encourage you to browse our website and welcome your questions and comments. A1 looks forward to helping you.