SSTS Rule, Statute and Law History

The SSTS rules have been revised several times. Below are the SSTS documents for  rule amendments adopted in 2016, 2015, 2014, 2012, 2011, 2008, 2006, 2002, 1999 and 1996.

Current Rule language

  • Chapter 7080: Individual Subsurface Sewage Treatment Systems (flows up to 5,000 gallons per day [gpd])
  • Chapter 7081: Midsized Subsurface Sewage Treatment Systems (flows from 5,001 to 10,000 gpd)
  • Chapter 7082: Administrative Requirements of Local SSTS Programs
  • Chapter 7083: Certification/Licensing, Product Registration, Advisory Committee

Expedited Rulemaking Amendments Effective 9/6/16

This rulemaking, authorized by the 2015 Minnesota Legislative Session, added flexibility to the permit determination process by allowing measured or estimated sewage flow values to be utilized for campgrounds and resorts open 180 days or less.

Expedited Rulemaking Amendments Effective 12/21/15

The MPCA amended its SSTS rules to comply with two rulemaking directives received during the 2015 Minnesota legislative session. These amendments simplify the regulation and administration of work on building sewers connected to septic systems and establish a process for septic professionals who have not met their continuing education requirements to apply for a one-year extension of professional certification eligibility.

Housekeeping Amendments Effective  1/21/14

This rulemaking only made minor corrections and clarifications to Chapters 7080, 7081, 7082 and 7083.

Good Cause Exempt (Alternative Local Standards) Amendments Effective 10/8/12

This rulemaking was a “good cause exempt” rulemaking that incorporated statutory changes relating to the adoption of alternative local standards.

Major Amendments Effective 3/14/11

Summary of Changes

  • Collection systems considered as SSTS
  • Modified tank access requirements
  • Setback clarification
  • No soil pit required for ISTS
  • Coarse sand = treatment, rock fragments do not
  • Rapidly permeable soils are Type I system
  • Simplified and less conservative soil loading charts
  • Type III system = only soil problems
  • Existing system compliance inspection must check all components
  • Apprentices must do observations
  • New Type IV treatment levels (A2 and B2)

Major Amendments Effective 2/4/08

Final Rule Language

Summary of Changes

  • Split rule into 4 parts – 7080, 7081, 7082, 7083
  • Product Registration – Advanced treatment devices and soil dispersal media
  • Tank testing and state listing
  • New license categories - Advanced Designers, Advanced Inspectors and Service Providers
  • Standards for mid-sized SSTS (MSTS)
  • Nitrogen requirements for SSTS over 2,500 gpd
    • Type IV systems
    • Pretreatment
    • Smaller systems
    • Less vertical separation distance
  • Management plan for all systems
  • Operating permit for systems greater than 2,500 gpd
  • System classification = "Types"
  • Inspector's discretion on failing to protect ground water
  • 15% reduction on existing system vertical separation distance
  • Increased septic tank sizing – all systems
  • Risers must come to the surface
  • Insulate shallow tanks
  • Pressurize seepage beds > 12 feet wide
  • Specific waste strength provided
  • 1/8-inch perforations allowed
  • 3 foot spacing of pressure laterals and perforations
  • Cleanouts on pressure laterals
  • Flow measurement with a pump
  • 12 inches of soil cover over the soil dispersal system
  • Coarse sand = no treatment
  • Sandy soils must be pressurized
  • No more Designer I category
  • Flows provided for Other Establishments
  • Ground water mounding for MSTS
  • Increased soils training — 6 hours of continuing education every 3 years
  • Mentorship
  • Three soil borings for new construction, soil pit required
  • Must do field inspection for new construction

Seasonal Saturation Amendments Effective 4/3/06

Final rule language

Summary of Changes

  • Amendments required per MN Laws Chapter 249 (2004) to redoximorphic features determination, interpretation, and seasonally saturated soil dispute.

Amendments Effective 9/16/02

*OnBase preferred ID 27 SR 377

Amendments Effective 10/04/99

* OnBase preferred ID 24SR426

Amendments Effective 1/23/96


For assistance, contact the MPCA Policy and Rule Staff