The 2008 and 2011 rule amendments included changes made to Minn. R. ch. 7080 to ensure that sewage tanks installed in Minnesota are being designed and constructed properly. Specifically, there are additional requirements for tanks to verify that they have adequate structural integrity, and that they are constructed to be watertight.
The tank is a watertight vessel that provides settling of solids, solidification of oils and scum, and allows the effluent to discharge to a succeeding tank, treatment device, or soil dispersal system. If a tank is not watertight it can be considered a direct sewage discharge to the ground water, which can negatively impact the environment and human health.
The MPCA will maintain a list of registered precast tanks that have been documented to our staff to adequately meet the Minn. R. 7080.2010 requirements. Only tanks that are registered with the Minnesota Pollution Control Agency (MPCA) may be used. Sewage tank manufacturers can submit their 'SSTS Application for Sewage Tank Listing' (see below under 'Forms for Sewage Tanks'), along with required information, to be placed on the 'List of Registered SSTS Sewage Tanks' if the requirements for tank registration are met. Tank manufacturers must submit the required data and verifications to be placed on the list of registered sewage tanks. The list will be posted when tank information is received and reviewed.
Sewage tanks include the following types of tanks: Septic tanks, Trash tanks, Holding tanks, Pump tanks, Surge storage tanks, Recirculation tanks and other processing tanks. The "List of Registered SSTS Sewage Tanks," and other related information, is provided on this web page.
Correspondence to SSTS practitioners
This letter was sent to licensed SSTS installers and local units of government. It states that only registered sewage tanks can now be installed in Minnesota, beginning January 1, 2013. The only exception is for tanks that are designed by a licensed professional engineer and approved by the local permitting authority for use in a specific system. (March 27, 2013)
Listing of SSTS sewage tanks
Current list of sewage tanks registered for subsurface sewage treatment systems (SSTS) in Minnesota. The list contains detailed model information, by manufacturer, for septic, trash, holding, pump, surge, recirculating and other processing tanks.
A quick reference guide to sewage tanks registered for subsurface sewage treatment systems (SSTS) in Minnesota.
Fact sheets and technical documents
- Sewage tank registration - How non-registered tanks can be used
- How to be placed on the 7080 Acceptable Tanks list - Fact sheet that answers sewage tank manufacturer questions about the tank-listing process.
Forms for sewage tanks
- SSTS Application for Sewage Tank Listing (wq-wwists3-65) - Application form to register new tanks to be completed by the sewage tank manufacturer and submitted to MPCA for review prior to sewage tank listing.
- SSTS existing registered sewage tank modification form (wq-wwists3-70) - Currently registered sewage tank models that are identical in design, but are listed for different uses under separate models can be listed as one model for multiple uses. Use this form to make that change. All new tank registration should still use the “SSTS Application for Sewage Tank Listing” form. Please refer to this correspondence with Tank Manufactures for more information SSTS letter to manufacturer’s (wq-wwists 1-59).
- SSTS Annual Watertight Testing Certification Form (wq-wwists3-66) - Form to be completed annually by the sewage tank manufacturer that certifies listed sewage tanks as watertight.
For more information regarding sewage tanks and tank testing, please contact Corey Hower at 507-206-2603, firstname.lastname@example.org