2025WI: Understanding Mounds: Servicing At Grade/Above Grade treatment Systems (DNR)

Description

• Understanding Mounds: Servicing At Grade/Above Grade treatment Systems
   Training Approval ID:   3ttg-t2r7
   Date Submitted:         09/19/2025
   Expiration Date:        11/19/2028
   Approved for:           2 hours General Septage
• Course summary: In this class we will review the reasons for use of low-pressure mounds/at grade/above grade systems, guidance documents in Wisconsin and the special challenges of servicing.
  Course outline: This course is TWO hours and divided into 20 minute segments covering the following: Understanding the term long term acceptance rate – i.e how much fluid can a treatment field hold without becoming saturated.
  * When we design systems and size them for the volume produced by the occupants – we are trying to ensure a slow steady flow and even distribution.
  * The most common type of failure of an absorption system is when the absorption system looses its ability to accept wastewater as fast as it is discharged from the Septic Tank. This results in ponding in the absorption system, and in severe cases, ponding on the surface or backup of sewers into the house. This kind of hydraulic failure can be caused by either saturated soil conditions or clogging of the soil surface where the treated wastewater is absorbed into the soil.
  * When an in-ground POWTS systems can’t be installed then a Wisconsin Mound is an alternative option.
• Educational materials are available for download and reference.