Who is orenco systems? Since 1981, Orenco Systems, Inc. has researched, designed, and manufactured innovative onsite and decentralized wastewater collection and treatment technologies. Our solutions include community collection systems, advanced secondary treatment systems, watertight fiberglass tanks, and in-tank pumping and filtration systems.Why orenco advantex treatment systems? Orenco’s AdvanTex ® Treatment Systems consistently produce clear effluent that’s suitable for a variety of reuse applications. Orenco Composites designs and manufactures high-tech, innovative fiberglass composite products. These include custom buildings, enclosures, tanks, and basins.Why choose orencos septic systems? Orenco’s septic pumping packages are an excellent option for most onsite applications. AdvanTex wastewater and greywater systems help commercial properties meet permit limits. From stores and restaurants to resorts and hotels, Orenco has a solution.