Illinois Plumbing Code Practice Exam 2026 – All-in-One Guide for Exam Success!

A "gray water" system is designated as a reclaimed water system for non-potable uses because gray water is defined as wastewater that is generated from domestic activities such as bathing, washing dishes, and laundry, but does not contain any human waste. This type of water can be treated and reused for certain applications, such as irrigation and toilet flushing, without being suitable for drinking purposes.

In the context of the Illinois Plumbing Code, gray water systems must adhere to specific guidelines to ensure they are safe and effective for the intended non-potable uses. The aim is to promote water conservation and resource recycling while safeguarding public health.

The other designations fail to accurately describe gray water systems. Potable water systems refer to water intended for human consumption, which gray water is not. Stormwater drainage systems are designed to manage rainfall runoff, separate from gray water. Lastly, sewage disposal systems deal with wastewater that contains human waste, differentiating them from non-potable gray water systems.