Residential Wastewater Treatment Systems

A residential wastewater treatment system (RWTS) is a wastewater treatment system that has been approved and listed to comply with Class I effluent standards adopted by NSF International, under NSF Standard 40, in accordance with General Statute 130A-342. RWTS have been verified during testing to meet EPA’s secondary treatment standards and can have a design daily flow up to 1,500 gallons per day. These units are reviewed and approved under 15A NCAC 18A .1957(c) (PDF) by Branch engineers.

Contact: Tricia Angoli, 919-707-5878

• Approval Requirements (PDF)
• Approvals and Drawings
  • Aqua Safe (PDF)
  • Bio-Microbics Inc.
    • Shoaf Septic Tank ATU 5 & 6 (PDF)
    • ATU-26 (PDF)
    • ATU-27 (PDF)
    • ATU-28 (PDF)
    • ATU-36 (PDF)
  • Clearstream Wastewater Systems Inc.
    • ATU - 14-23 (PDF)
  • Consolidated Treatment Systems
    • RWTS 24, 25, 29, 30, 31, 37 (PDF)
  • Delta Fiberglass and Environmental Products Inc.
    • ATU-3 (PDF)
    • ATU-12 (PDF)
    • ATU-13 (PDF)
  • Hoot Aerobic Systems Inc.
    • ATU-32-35 (PDF)
  • Hydro-Action Industries
    • ATU-46, 47, 48, 49 and 50 (PDF)
  • Jet Inc.
    • Approval Numbers 38 through 43 (PDF)
  • Norweco
    • Singulair Bio-Kinetic Model 960 Series and Model TNT Series (PDF)
    • RWTS 7, 8, 9 ,10, 11 and 52-70
      • Revised Approval (PDF)
      • Approval Letter (PDF)