Illinois Private Sewage Contractor Practice Exam 2026 – Comprehensive Prep Guide

The required distance between joints for distribution lines constructed from approved material is specified to be between 1/2" to 3/4" apart. This spacing is critical to ensure that the joints are properly aligned and capable of withstanding the pressures and movements that occur within the sewage system.

Adhering to this distance helps minimize the risk of leaks and allows for adequate expansion and contraction of the materials due to temperature changes. Proper joint spacing also ensures that the gravity flow is maintained smoothly within the distribution lines, which is essential for the overall efficiency of the sewage system. If the joints are too close together, there may be increased stress and potential failure at the joints, while too much spacing may compromise the structural integrity of the system and its ability to function effectively.

Therefore, adhering to the 1/2" to 3/4" specification is an important best practice in maintaining a reliable and efficient private sewage system.