Maintenance Worker Practice Test 2025 - Free Maintenance Exam Questions and Study Guide

The normal diameter range for a main sewer line in Maine is typically between 6 to 8 inches. This range is commonly accepted as it balances the need for adequate wastewater flow and the capacity to handle peak loads in residential and commercial areas. Sewer systems are designed based on numerous factors, including the number of users, the types of waste being processed, and local regulations.

Choosing a diameter within this range ensures that there is enough volume to prevent backups and maintain effective flow while also taking into account the physical constraints and installation costs commonly faced in municipal planning. In contrast, a diameter smaller than 6 inches may not be sufficient for larger sewer systems, while a diameter larger than 8 inches may be unnecessarily expensive and complex for typical residential application. This makes the 6 to 8-inch range standard among many municipalities.