Which of the following is not considered a private sewage disposal system under Illinois law?

In Illinois, a private sewage disposal system is designed for the treatment and disposal of wastewater that is generated from individual residences or specific facilities, as opposed to systems that serve larger communities. A public sewer system is managed and maintained by a municipal authority and is typically designed to handle wastewater from multiple properties, which distinguishes it from private sewage systems.

The septic tank, drainfield, and holding tank are all components or types of private sewage disposal systems. Each of these systems is intended for individual use and operates outside the jurisdiction of public sewer management. The septic tank treats incoming wastewater through a natural process, while the drainfield allows for the absorption and treatment of effluent in the soil. A holding tank, on the other hand, temporarily stores wastewater until it can be transported for treatment, making it a viable option where traditional disposal methods are not possible.

Understanding the definition of a private sewage disposal system is crucial, as it helps clarify what systems operate independently for individual users as opposed to what is involved in a broader public infrastructure aiming to handle community wastewater management efficiently.