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 - 15A NCAC 18E Section .1500 (PDF) - Updated 2/17/25
• Approvals and Drawings
  • Aqua Safe
    • Aqua Safe RWTS Approval (PDF) - Updated 1/7/25
  • Bio-Microbics Inc.
    • Bio-Microbics Inc. RWTS Approval (PDF) - Updated 1/7/25
  • Clearstream Wastewater Systems Inc.
    • Clearstream Wastewater Systems Inc. RWTS Approval (PDF) - Updated 1/7/25
  • Infiltrator Water Technologies (formerly Delta Fiberglass and Environmental Products Inc.)
    • Infiltrator Water Technologies RWTS Approval (PDF) - Updated 1/7/25
  • Hoot Aerobic Systems Inc.
    • Hoot Aerobic Systems Inc. RWTS Approval (PDF) - Updated 1/7/25
  • Hydro-Action Industries
    • Hydro-Action Industries RWTS Approval (PDF) - Updated 1/7/25
  • Jet Inc.
    • Jet Inc. RWTS Approval (PDF) - Updated 1/7/25
  • Norweco
    • Norweco RWTS Approval (PDF) - Updated 1/7/25