Jul. 11, 2017 EPA

MS4 Compendium of Permits - Green Infrastructure Permit Provisions Making a Difference for Water Quality

 EPA has published online the third in its MS4 Permit Compendium series. While written for MS4 permit writers and aficionados, each compendium has examples of permits with some provisions that include green infrastructure. For Part 3: Water Quality-Based Requirements, EPA reviewed existing state and EPA permits and identified different ways of implementing TMDLs through quantitative requirements or pollutant-specific management measures such as green infrastructure, or a combination of both.

EPA gleaned examples of how permitting authorities measured progress of implementation of water quality-based requirements through review and approval of implementation plans, monitoring/modeling, and reporting requirements. EPA also include examples of water quality-based requirements related to discharges to impaired waters without approved TMDLs.

The first two compendia, found via the links below, also feature examples from existing MS4 permits of clear, specific and measurable requirements:

Part 1: Six Minimum Control Measure Provisions

Part 2: Post Construction Standards