Subsurface Sewage Treatment Systems



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I. Introduction

I. A. Purpose of this document


This document was developed to present a clear process for design of larger and more complex Subsurface Sewage Treatment Systems (SSTS). The concepts in this document can be applied to all systems which have its starting point from small code complying systems and includes differences for the larger and more complex systems. The concepts should be applied by all advanced professionals and these concepts can be used as a basis for local government review and approval. Minn. Stat. § 115.56, subd. 2 states:

(a) Except as provided in paragraph (b), a person may not design, install, maintain, pump, inspect, or provide service to a subsurface sewage treatment system without a license issued by the commissioner. Licenses issued under this section allow work on subsurface sewage treatment systems that do not require a state permit using prescriptive designs and design guidances provided by the agency. Licensees who design systems using these prescriptive designs and design guidances are not subject to the additional licensing requirements of section 326.03.”



and

(g) No other professional license under section 326.03 is required to design, install, maintain, inspect, or provide service for a subsurface sewage treatment system that does not require a state permit using prescriptive designs and design guidances provided by the agency if the system designer, installer, maintainer, inspector, or service provider is licensed under this subdivision and the local unit of government has not adopted additional requirements.”



This design guidance provides prescriptive designs and guidance for systems up to 10,000 gallons per day (gpd). It is the intent of the Minnesota Pollution Control Agency (MPCA or Agency) to periodically review, update, and expand this document, as needed, to meet the needs of advanced designers and the SSTS industry.

I. B. Design guidance for systems


The following documents listed in Table IA constitute SSTS prescriptive designs and design guidance:

Table I. A list of standards for advanced designed systems

Sewage Flow

Volume

Type of System

Design Guidance References

0 to 2,500 gpd

Types I, II and III

2,501 to 5,000 gpd

Types I, II and III

  • Minn. R. ch. 7080

  • MPCA List of SSTS Sewage Tanks

  • MPCA List of Registered Treatment Products for Residential Strength Sewage

  • MPCA List of Registered Treatment Products for High Strength Waste

  • MPCA List of Registered Distribution Media Products

  • MPCA Drainfield Rock Distribution Media Recommended Standards and Guidance

  • MPCA Remediation Technologies and Processes for Subsurface Sewage Treatment Systems

  • This Design Guidance Manual

  • University of Minnesota Design Forms (worksheets)

0 to 5,000 gpd

Type IV

  • Minn. R. ch. 7080

  • MPCA List of SSTS Sewage Tanks

  • MPCA List of Registered Treatment Products for Residential Strength Sewage

  • MPCA List of Registered Treatment Products for High Strength Waste

  • MPCA List of Registered Distribution Media Products

  • MPCA Drainfield Rock Distribution Media Recommended Standards and Guidance

  • MPCA Remediation Technologies and Processes for Subsurface Sewage Treatment Systems

  • This Design Guidance Manual

  • University of Minnesota Design Forms (worksheets)




Sewage Flow

Volume

Type of System

Design Guidance References

5,001 to 10,000 gpd

Types I - IV

  • Minn. R. ch. 7081

  • MPCA List of SSTS Sewage Tanks

  • MPCA List of Registered Treatment Products for Residential Strength Sewage

  • MPCA List of Registered Treatment Products for High Strength Waste

  • MPCA List of Registered Distribution Media Products

  • MPCA Drainfield Rock Distribution Media Recommended Standards and Guidance

  • MPCA Remediation Technologies and Processes for Subsurface Sewage Treatment Systems

  • This Design Guidance Manual

  • University of Minnesota Design Forms (worksheets)

If a conflict exists between these referenced documents and this standards and guidance, these standards and guidance shall apply. Please report these discrepancies to the Agency.

Each of the documents related to the registration of SSTS products are found on the MPCA website at: www.pca.state.mn.us/programs/ists/productregistration.html. The SSTS products found on this website include: 1) sewage tanks, 2) treatment products for residential strength sewage, 3) treatment products for high strength sewage, and 4) distribution media products. Other information is contained on this website, including letters to manufactures and operating permit templates. The University of Minnesota (U of M) Onsite Sewage Treatment manual can be found at: septic.umn.edu/sstsmanual/index.htm. The U of M design forms are located at: septic.umn.edu/formsandsheets/bytype/index.htm#design, or use the copy you received during the U of M training.


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