Updating the County-wide Act 167 Stormwater Management Model Ordinance

​Final Drafts of the updated Model Ordinance and Appendices Available for Review

January 28, 2021

In late November, the Chester County Water Resources Authority (CCWRA) released the Final Draft of the updated “County-wide Act 167 Stormwater Management Model Ordinance” for 45-day public review and comment and for review by municipal governing bodies, municipal planning agencies, and school districts for consistency with other plans and programs affecting the County’s watersheds (per the provisions of PA Act 167). This review and comment period ended on January 7. The final draft of the updated County-wide Act 167 Stormwater Management Model Ordinance, associated appendices, and a summary of changes document, and response to public comments document can be found at the links below. There were no changes made to the versions of Appendix C and Appendix D that were included in the 2013 County-wide Model Ordinance.

Document Links

Clean Draft County-wide Act 167 Model Ordinance

Summary of Changes Table

Appendix A: Simplified Approach to Stormwater Management for Small Projects Handbook

Appendix B: Conservation Design and Low Impact Development Site Design

Appendix C: Runoff Coefficients and Curve Numbers

Appendix D: West Nile Virus Design Guidance

Appendix E: Stormwater Best Management Practices and Conveyances  Operation and Maintenance Sample Agreement

Watershed Plan Advisory Committee (WPAC) Meetings, Communications, and Members and Public and Stakeholder Meetings and Presentations

Response to 45-Public Review Comments

​November 5 Plan Advisory Committee Meeting 

November 6, 2021

The Chester County Water Resources Authority hosted a Plan Advisory Committee meeting on November 5 to present a draft of the updated County-wide Act 167 Stormwater Management Model Ordinance. A recording of this meeting is available at this link, and the agenda for the event is available here.  Slides from the presentations delivered at this event are available below. 

Introduction and Welcome Slides

Draft Stormwater Management Model Ordinance Review Slides

Appendix A and Appendix E Updates 

Appendix B: Conservation Design and Low Impact Development Site Design 

Stormwater Management Survey

April 21, 2021 Chester County is working to review and update the County-wide Stormwater Management Model Ordinance first adopted in 2013. The updated model ordinance will be developed in close consultation with the County’s municipalities to protect public health and safety and to improve water quality by implementing drainage and stormwater management provisions for new land development and construction. We are asking for your perspective on the stormwater issues impacting Chester County by completing at least one of two survey options.

   Survey 1 - for all who live or work in Chester County

   Survey 2 - for municipal engineers, municipal staff and elected officials

Please use this opportunity to provide us with your input at your earliest convenience.

Chester County Partnering with CEDARVILLE Engineering Group, LLC and Gaadt Perspectives, LLC to Update Model Stormwater Ordinance

March 4, 2021

Chester County is pleased to announce the selection of CEDARVILLE Engineering Group, LLC and Gaadt Perspectives, LLC to support the County in reviewing and updating the County-wide Stormwater Management Model Ordinance. The updated model ordinance will be developed in close consultation with the County’s municipalities to protect public health and safety and to improve water quality by implementing drainage and stormwater management provisions for new land development and construction. This updated model ordinance will comply with Pennsylvania Department of Environmental Protection’s (PA DEP) standards for MS4 municipalities. The update of the model ordinance is one of the first steps in the County's strategy to update the County’s integrated water resources plan to support the implementation of Landscapes3, Chester County's award winning comprehensive plan.