Septic tanks must have a minimum of two maintenance holes with a minimum diameter of 20 inches (least dimension). Maintenance holes must be placed over the inlet baffle or the center of the tank and the outlet device (baffle or screen). The maintenance holes must be large enough to allow pumping without interference. Enough maintenance holes must be provided so access can be gained within six feet of all walls for solids removal of each compartment. Inspection pipes of no less than six inches must be provided over any baffles that are not otherwise accessible through a maintenance hole.
Pump tanks must have a minimum of one maintenance hole with a minimum diameter of 20 inches (least dimension). Enough maintenance holes must be provided so access can be gained within six feet of all walls for solids removal.
All maintenance hole risers must extend through the tank cover above final grade.
Covers for maintenance holes must:
be secured by being locked, being bolted or screwed, having a weight of at least 95 pounds, or other methods approved by the local unit of government. Covers shall also be leak resistant; and be designed so the cover cannot be slid or flipped, which could allow unauthorized access to the tank;
have a written and graphic label warning of the hazardous conditions inside the tank;
be capable of withstanding a load that the cover is anticipated to receive; and
be made of a material suitable for outdoor use and resistant to ultraviolet degradation.
October 10, 2013
Copyright © 2013 by the Revisor of Statutes, State of Minnesota. All rights reserved.