Welcome to A-1 Septic Service and Installation! We serve the Northwood's of Wisconsin including: Rhinelander, Minocqua, Eagle River, Tomahawk and surrounding areas. Our office is located on Hwy. K as it intersects Hwy. N just a few miles from Rhinelander. A-1 Septic Service and Installation is the premier septic company of the Northwood's. We are fully licensed to service, repair, and install all types of septic systems, and we offer a wide range of services to provide for all of your septic needs. Soil Testing, Septic System Design, Septic System Installation, Septic System Repairs, Pumping service, residential and commercial, by radio dispatched trucks resulting in exceptionally prompt service. Portable toilet rentals.