SF5180

Purpose

To change how compliance for subsurface sewage treatment systems (SSTS) is assessed by allowing the use of the best available evidence, rather than relying only on a single traditional type of test. The goal is to ensure that determinations of whether an SSTS meets requirements are based on current, verifiable data about groundwater contamination and soil indicators.

Main provisions

• Best evidence standard
  • The bill adds a new subdivision to Minnesota law defining “best evidence of compliance.” This means agencies, local units of government, and inspectors must use the best available evidence to determine if an SSTS meets applicable requirements.
• What counts as best evidence (less than two years old)
  • The following testing methods/sources are prioritized, with results under two years old accepted: 1) A measurement of groundwater contaminants by a laboratory accredited by the Department of Health. 2) Continuous, uncompressed probe-measured depth below the drain field base media to the groundwater table. 3) Data from the National Groundwater Monitoring Network or from a watershed district’s historical depth-to-groundwater information. 4) Empirical field measurements of depth to mottled soil. 5) Depth to mottled soil with redoximorphic features, based on Munsell soil color charts.
• Acceptance of results
  • Agencies and inspectors must accept results under two years old from the methods listed above if the property owner or lessee offers to submit the results.
• Notice and rights
  • If the owner/lessee offers to submit the results, the agency must notify a person of their rights under this subdivision at least 90 days before issuing a notice of noncompliance.

Significant changes to existing law

• Introduces a formal “best evidence” framework for evaluating SSTS compliance, expanding beyond traditional single-method determinations.
• Establishes a prioritized, time-bounded list of acceptable evidence (all under two years old) from multiple sources, including groundwater testing, soil indicators, and official groundwater datasets.
• Creates a mandatory 90-day rights-notice period before noncompliance actions can be issued when owners submit evidence, potentially delaying enforcement in favor of data submission.
• Potentially broadens the pool of acceptable evidence for compliance decisions and may influence how quickly and how often compliance is determined.

Practical implications

• May reduce enforcement disputes by formalizing multiple credible data sources to establish compliance.
• Could increase use of soil color and soil moisture indicators (Munsell-based redoximorphic features) in official determinations.
• Encourages property owners to submit recent data to demonstrate compliance, given a longer notice window before potential penalties.

Relevant Terms - subsurface sewage treatment system (SSTS) - best evidence of compliance - groundwater contaminants - groundwater table - drain field base - depth to groundwater - mottled soil - redoximorphic features - Munsell soil color charts - National Groundwater Monitoring Network - watershed district - Department of Health (DOH) - testing methods - owner/lessee - notice of noncompliance - Minnesota Statutes 2024 section 115.55 - subdivision 14 - age of data (less than two years)