Updating the County-wide Stormwater Ordinance

Chester County has completed a draft of the updated County-wide Act 167 Stormwater Management Model Ordinance. Over the past two years, the Chester County Water Resources Authority has collected input from residents, municipalities, and stakeholder groups at over two dozen in-person and virtual input and informational meetings and through the use of questionnaires and online surveys. The updated Model Ordinance  was designed to meet the needs of Chester County municipalities, fulfill the standards set forth in the Pennsylvania Storm Water Management Act (“Act 167”), and comply with the regulatory requirements of Pennsylvania Department of Environmental Protections’ (PA DEP) National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) program. This updated County-wide Stormwater Management Model Ordinance will be a component of the updated County-wide Act 167 Stormwater Management Plan and was developed in coordination with the updates to the County’s integrated water resources plan, Watersheds.

​Draft Model Ordinance Documents for Review


The Chester County Water Resources Authority (CCWRA) is releasing 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).  The Final Draft of the updated County-wide Act 167 Stormwater Management Model Ordinance, associated appendices, and a summary of changes 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 original County-wide Model Ordinance that was adopted by the County in 2013. In the draft of the Model Ordinance below, text that has been added to the original Model Ordinance is highlighted in green and text that has been removed is highlighted in red. 

Comments on these draft documents can be submitted through this link or can be emailed to [email protected] through January 7, 2022. 

Document Links

Draft County-wide Act 167 Stormwater Management 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 E: Stormwater Best Management Practices and Conveyances  Operation and Maintenance Sample Agreement

​ November 5 Plan Advisory Committee Meeting 


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 - We Need to Hear from You!

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.

Stormwater surveys

   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 to Update Model Stormwater Ordinance


March 4, 2021
Chester County is pleased to announce the selection of CEDARVILLE Engineering Group, 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.

Public Comments Welcome


A series of public and stakeholder input meetings have already been held starting in October 2019 to determine important topics of interest related to water resources management, including stormwater management.

Additional public and stakeholder meetings will be held throughout the planning process to continue to gather information on concerns with the provisions in the Model Ordinance and to discuss potential changes proposed to address these concerns. In addition to these public input meetings, the County-wide Act 167 plan updates will be guided by a Watershed Plan Advisory Committee (WPAC), which will be composed of representatives from municipalities throughout the County, the public, and other interested stakeholder groups.

Please email us at [email protected] if you would like to be notified of upcoming public outreach work sessions.


Current Stormwater Plan and Stormwater Ordinance