Established in 1999, the Ontario Onsite Wastewater Association (OOWA) is a provincial not-for-profit association dedicated to promoting the benefit and value of onsite and decentralized wastewater management through education, improved standards of practice, and advocacy for sound policies across the province. Our membership is made up of a large array of industry professionals, including installers, designers, technicians, inspectors, haulers, policy makers and enforcement authorities, academics, researchers, and teachers.