As areas are developed, the amount of paved surfaces increase leading to an increase in stormwater volume and pollutants, which if uncontrolled  can harm lakes, rivers, streams, and coastal areas. Stormwater managers are using techniques like planning their sites to reduce imperviousness and incorporating stormwater controls like green infrastructure  to reduce stormwater pollutants.

Municipal Separate Storm Sewer System (MS4) permits specify minimum elements and require regulated MS4 owners/operators to develop, implement, and enforce a program to reduce pollutants in any stormwater into the small MS4 from certain post-construction activities. This primarily includes developing:

• Strategies to implement a combination of structural and non-structural BMPs,
• An ordinance to address post-construction runoff, and
• A program to ensure adequate long-term operation and maintenance of BMPs.

Best Management Fact Sheets

The fact sheets describe practices that stormwater managers may consider as they develop their programs. These fact sheets generally provide applicability, implementation, and effectiveness information to help municipal stormwater operators develop their programs.  Complete listing of Fact Sheets can be found at: https://www.epa.gov/npdes/national-menu-best-management-practices-bmps-stormwater-post-construction

• Bioretention Rain Gardens
• Dry Detention Ponds 
• Grassed Swales
• Green Parking
• Green Roofs
• Infiltration Basin
• Infiltration Trench
• Native Gardens
• On-Lot Treatment
• Permeable Pavers
• Protection of Natural Features
• Stormwater Inlet Controls
• Stormwater Wetland
• Vegetated Filter Strips
• Wet Ponds

Helpful Forms and Handouts for Stormwater Control Measures

• Fillable Post Construction Stormwater Management Plan Maintenance Agreement
• Stormwater Quality Packet 
• Stormwater Dry Detention Annual Inspection Form
• Stormwater Control Measures Annual Maintenance Inspection and Report Cover Sheet
• EXAMPLE - Detention Basin BMPs
• EXAMPLE - Bioretention Cell BMPs
• Attachment A: Wet Pond Stormwater Control Measures (SCM) Inspection Report
• Attachment B: Bioretention Cell Stormwater Control Measures (SCM) Inspection Report
• Attachment C: Stormwater Wetland Stormwater Control Measures (SCM) Inspection Report
• Attachment D: Dry Detention Pond Stormwater Control Measures (SCM) Inspection Report
• Attachment E: Grass Swale Stormwater Control Measures (SCM) Inspection Report
• Attachment F: Infiltration Basin Stormwater Control Measures (SCM) Inspection Report