Contents
Municipal operation inspections
The municipal separate storm sewer system (MS4) General Permit requires inspections of certain municipally owned/operated facilities, areas, or stormwater best management practices (BMPs) (MS4 General Permit Part III.D.6.e). This includes:
- Annual inspections of structural stormwater BMPs to determine structural integrity, function, and maintenance needs.
- At least one inspection every permit term of stormwater ponds and outfalls to determine structural integrity, function, and maintenance needs.
- Quarterly inspections of stockpiles, and storage and material handling areas identified in the Facility Inventory to determine function and maintenance needs.
During each of these inspections, inspectors must look for evidence of illicit discharges (MS4 General Permit Part III.D.3.c.). All inspections must be documented (MS4 General Permit Part III.D.6.h.(1)).
Resources
Fact sheets and guidance documents
- MPCA Managing Stormwater Sediment BMPs guidance - Guide for properly managing sediment from stormwater systems, such as ponds
- Documentation that MS4 staff should retain - List of all the documentation requirements (what information to keep, how long to keep it, level of detail to keep, etc.) for compliance with the MS4 permit
Checklists and templates
- Bioretention construction inspection checklist: File:Bioretention - construction inspection checklist.xlsx (link to table)