It’s important for development projects to consider stormwater management requirements and layout early in the project planning process. This page will help to determine project applicability to the PWD Stormwater Regulations.
To learn more about stormwater management and watershed issues in Philadelphia, check out the Stormwater 101 page. For more detailed information, please refer to the Introduction of the Philadelphia Stormwater Management Guidance Manual (Manual).
The requirements of PWD’s Stormwater Regulations are determined by a project’s earth disturbance.
|Examples of Earth Disturbance include, (but are not limited to)|
At a minimum, development projects that propose more than 5,000 square feet of earth disturbance must submit an Existing Resource Site Analysis (ERSA) Application to PWD. There are additional requirements as the earth disturbance value increases:
|Stormwater Management Requirements based on Earth Disturbance|
|<5,000 SF||5,000 – 15,000 SF||15,000 SF – 1 Acre||>1 Acre|
No ERSA Submission Required. Install Erosion and Sediment (E&S) Controls as needed.
Note that there are other factors besides earth disturbance, such as development type and watershed, that will determine specific stormwater management requirements. For more information, refer to Design and Permitting.
Going above and beyond the Regulations
In addition to the Stormwater Regulations, PWD is also responsible for reviewing residential developments that are seeking a Green Roof Density Bonus as specified in §14-602.7 of the Zoning Code. This review must be conducted before the project can obtain a Zoning Permit from the Department of Licenses & Inspections. Find out more about submission requirements here.
For Projects located in a combined sewer service area, PWD funding may be available to upsize stormwater management systems to capture runoff from existing impervious area either on site or in adjacent public streets. For more information email email@example.com.
Managing stormwater runoff to meet or exceed the PWD Stormwater Regulations can also help a project achieve LEED certification. Contact a LEED professional to learn more.
- See Chapter 1: Regulatory Requirements of the Philadelphia Stormwater Management Guidance Manual
- Contact PWD Stormwater Plan Review at firstname.lastname@example.org
- Attend Walk-In Hours! Held every Tuesday from 11 am – 1 pm on the 5th Floor of 1101 Market Street. No appointment necessary, just drop by! (temporarily suspended due to COVID-19 Pandemic)
- Applicants can also request a Pre-Application Meeting for a more formal discussion of the project with various units from PWD.