Stormwater Management

  1. Stormwater Management
  2. MS4 Program
  3. Illicit Discharge Contact Information

In some way everybody contributes to polluting our waterways and in nearly every case we can help keep our water clean simply by making a few small adjustments. Understanding more about Stormwater Runoff will help you do your part to help keep our water clean.

Stormwater Management for Building Projects

On December 13, 2022 the Borough of Phoenixville adopted a new Stormwater Management Ordinance to minimize the impacts of new development, redevelopment and other earth disturbance activities to protect, sustain and enhance the quality and quantity of all water resources to ensure the health, safety and welfare of the citizens and preserve the diverse natural resources and aesthetic and recreational assets of Phoenixville Borough, Chester County and the Commonwealth of Pennsylvania.

National Pollutant Discharge Elimination System (NPDES)

In addition to the requirements under local zoning and ordinances, federal regulations require individual land development projects to obtain National Pollutant Discharge Elimination System (NPDES) permits for all land development projects that disturb one acre or more. The 1999 update to the federal stormwater regulations also required municipalities throughout Pennsylvania to obtain NPDES permits for their stormwater discharges. Each permit holder must implement and enforce a stormwater management program that reduces the discharge of pollutants to the maximum extent practicable.

Chester County Water Resources Authority

Chester County’s Water Resources Authority, through Act 167, has created a county-wide integrated water resources management plan that includes the implementation of the local stormwater ordinance (PDF). More information is available on their website.

The Chester County Water Resources Authority has prepared a Homeowner and Small Projects Factsheet (PDF) to accompany the following changes. A guide (PDF) created to assist you to develop and implement a stormwater management plan for your property has been created.


View or download the Stormwater Management Application (PDF).


View or download the Stormwater Management Simplified Approach Appendices (PDF).

Flood Insurance Rate Maps

The state Department of Community and Economic Development maintains a website containing the new Digital Flood Insurance Rate Maps established by the Federal Emergency Management Agency (FEMA). The site will help users determine if they are located in a floodplain and assist local officials in their creation of floodplain-management strategies to ensure public safety