Stormwater and National Pollutant Discharge Elimination System (NPDES) Phase II

Stormwater discharges are generated by runoff from land and impervious areas such as paved streets, parking lots, and building rooftops during rainfall and snow events that often contain pollutants in quantities that could adversely affect water quality. Most stormwater discharges are considered point sources and require coverage by a National Pollutant Discharge Elimination System (NPDES) permit. The primary method to control stormwater discharges is through the use of best management practices (BMPs).

Under the NPDES General Permit for Small Municipal Separate Storm Sewer Systems (MS4), many of the Chagrin River watershed communities are required to submit Phase II stormwater management programs to detail how each individual community will comply with the Phase II mandates. These regulations require designated communities to develop and implement a stormwater management plan. This program is composed of six minimum control measures:

(1) Public Education
(2) Public Involvement
(3) Illicit Discharge Detection and Elimination
(4) Construction Site Runoff Control
(5) Post Construction Site Runoff Control
(6) Good Housekeeping

Resources

• Small MS4 Stormwater Program Overview
  
• CRWP supported training courses and workshops for which communities can take credit under their Phase II program
  
• Renewal of NPDES General Permit for Small Municipal Separate Storm Sewer Systems (MS4) January 30, 2009 - January 29, 2014
  
• MS4 Program Evaluation Guidance - US EPA Office of Wastewater Management
  MS4 Program Evaluation Guidance Appendices B through D
  Appendix B - Program Evaluation Worksheet
  Appendix C - Field Inspection Worksheets
  Appendix D - Reviewing an Annual Report
  
• Watershed-Based National Pollutant Discharge Elimination System Permitting Implementation Guidance (pdf 1.65MB)