How far below finished grade can cleanout and baffle inspection manholes be installed?

Cleanout and baffle inspection manholes are crucial components in septic system design, allowing for easy access to the system for maintenance and inspection. According to Connecticut's regulations, these manholes must be installed no deeper than 12 inches below finished grade. This depth allows for practical access while ensuring that maintenance personnel can easily reach them without significant digging, which can also help prevent potential damage to the septic system.

Keeping these structures at a controlled depth reduces the likelihood of infiltration of surface water into the system and maintains the integrity of the septic system. Depths greater than 12 inches might complicate access and increase the risk of issues related to accessibility during inspections or maintenance. This regulatory guidance is in place to facilitate proper system management and ensure effective operation, emphasizing ease of access as a priority in septic system design.