• Alberta Onsite Wastewater Management Association

• British Columbia Onsite Sewage Association

• CanadianEnvironmental.com

• Concrete Precasters Association of Ontario

• National Onsite Wastewater Recycling Association

• National Small Flows Clearinghouse

• Ontario Association of Sewage Industry Services

• Ontario Building Officials Association

• Ontario Ministry of Municipal Housing and Affairs

• Ontario Rural Wastewater Centre

• Onsite Installer Magazine

• On-site Wastewater Centre North Carolina

• OPCEA — Ontario Pollution Control Equipment Association

• Ottawa Septic System Office

• University of Rhode Island On-Site Wastewater Training Centre

• Water Environment Association of Ontario