Region 4 CII Permit: Is the Property Owner or Tenant Responsible for Compliance?

Property owner and facility operator reviewing Region 4 CII Permit stormwater compliance responsibilities at an industrial site.

Determining CII stormwater owner-tenant responsibility requires more than checking the property deed or identifying who runs the facility each day. Under Order R4-2026-0226, the Discharger is either the owner or operator of the CII site, depending on who has sufficient authority and operational control to satisfy every applicable permit condition.1 The responsible party must be […]