County-wide Act 167 Stormwater Management Plan and 2022 Model Ordinance Update

County-wide Act 167 Stormwater Management Model Ordinance Documents 

The updated County-wide Act 167 Model Ordinance is the culmination of and was significantly shaped by nearly three years of collaboration between Chester County, its municipalities, residents, and other stakeholders. It was designed to meet the needs of Chester County’s municipalities, fulfill the standards set forth in the Pennsylvania Storm Water Management Act (“Act 167”), and comply with the regulatory requirements of PA DEP’s National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) program. The updates incorporated into the Model Ordinance were also designed to comply with the provisions included in PA DEP's 2022 Model Stormwater Management Ordinance.

Links to updated versions of the adopted Model Ordinance and supporting documents can be found below. The following documents were also updated for consistency with the changes to the Model Ordinance: Appendix B, Appendix E, the Matrix of Minimum Standards, Summary of Changes, and Summary of Options. Municipalities should reference these latest documents when updating their ordinance to be consistent with PA DEP’s 2022 Model Ordinance and the County-wide Act 167 Model Stormwater Ordinance. 

• County-wide Act 167 Stormwater Management Model Ordinance (Word document)
  (Final PADEP reviewed version, Updated 12/1/2022)
• County-wide Act 167 Stormwater Management Model Ordinance with all changes highlighted (Word document) (Final PADEP reviewed version, Updated 12/1/2022)
• Model Ordinance Appendix A: Simplified Approach to Stormwater Management for Small Projects (Word document)
• Model Ordinance Appendix B: Conservation Design and Low Impact Development Site Design (Word document, Updated 6/2/2022)
• Model Ordinance Appendix C (Complete PDF):
  • Cover Pages for Editing (Word document) 
  • Runoff Coefficients and Curve Numbers (PDF)
• Model Ordinance Appendix D: West Nile Virus Design Guidance (Word document)
• Model Ordinance Appendix E: Stormwater Best Management Practices and Conveyances Operation and Maintenance Sample Agreement (Updated 6/2/2022)

Model Ordinance Implementation Resources 

Below are additional resources to assist Municipalities with updating their ordinances to be consistent with the County-wide Model Ordinance. 

• Summary of Changes Table (Updated 6/2/2022):  The Summary of Changes Table lists all of the substantive changes made to the 2013 model ordinance. 
• Matrix of Minimum Mandatory Ordinance Standards (Updated 6/2/2022): The Matrix of Minimal Mandatory Standards outlines the minimum standards municipal ordinances must include to be consistent with the County-wide Model Ordinance. The Municipality may set more restrictive or stringent standards and requirements than those included in the Matrix, but they cannot set less restrictive standards. 
• List of Model Ordinance Sections with Options for Modifying Standards and Requirements (Updated 6/2/2022): This resource provides a comprehensive overview of all sections in the Model Ordinance where the Municipality is presented with choices for determining the level and extent of the standards and requirements to be included in their Ordinance.
• Certification of Ordinance Adoption Form (Word document): Upon final adoption of the model ordinance or equivalent minimum mandatory ordinance standards, each municipality must submit this form to Pennsylvania Department of Environmental Protection’s Bureau of Point and Non-Point Source Management and send a copy to the Chester County Water Resources Authority.
• Example Schedule of Fees (Word document): This example schedule of fees has been modified from the Crum Creek Act 167 Model Ordinance. This document is meant only as an example, and can be modified by the municipality to meet their needs. If the municipality chooses to require fees for stormwater site plan reviews and BMP inspections, it is recommended that a fee schedule be adopted independent of the ordinance to allow for fees to be adjusted as needed without having to go through the public hearing process. 
• Response to 45 Day Public Review Comments: This document includes responses to the comments received during the 45-day public review and comment period. 
• Watershed Plan Advisory Committee (WPAC) Meetings, Communications, and Members and Public and Stakeholder Meetings and Presentations: This document lists all of the Watershed Plan Advisory Committee (WPAC) meetings, all email communications to the municipalities, and all public and stakeholder input meetings.