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NPDES MS4 Permit from DEP

As part of the Clean Water Act, the U.S. Environmental Protection Agency (EPA) has developed stormwater management regulations to improve water quality. The Township was required to apply for a National Pollutant Discharge Elimination System (NPDES) permit which is administered through the Pennsylvania Department of Environmental Protection (DEP). This permit is a 5-year program which began in 2003. The permit is broken up into 6 control measures which include: Public Outreach and Education, Public Participation and Involvement, Illicit Discharge Detection & Elimination, construction site stormwater runoff control, Post-Construction Storm Water Management in New Development and Redevelopment, and Pollution Prevention and Good Housekeeping for Municipal Operations and Maintenance.

POLLUTANT REDUCTION PLAN AVAILABLE FOR PUBLIC COMMENT – TREDYFFRIN TOWNSHIP NOTICE IS HEREBY GIVEN that the Tredyffrin Township Pollutant Reduction Plan (PRP) will be available for public review and comment for a 30-day comment period beginning on Wednesday, November 8, 2017 through Friday, December 8, 2017. The plan will be available for review and comment at the Tredyffrin Township Municipal Building, 1100 DuPortail Road, Berwyn, PA 19312. Tredyffrin Township has developed this plan in order to meet the requirements of the 2018-2023 National Pollutant Discharge Elimination System (NPDES) Individual Permit Application to discharge stormwater from the Municipal Separate Storm Sewer System (MS4).  Under the new MS4 permit, Tredyffrin Township is required to reduce pollutants to surface waterways of the township including Little Valley Creek, Valley Creek, Gulph Creek, Crum Creek, Darby Creek, Crow Creek, and Trout Creek.  All comments should be submitted in writing to the Township no later than 5:00pm, December 8, 2017.

Click here to view the Final Tredyffrin Township Pollution Reduction Plan (December 20, 2017).

Click here to view the 2018 Stormwater Permit MS4 Requirements Presentation, presented to the Board of Supervisors on November 8, 2017.

The pages in this department are set up to address some of these issues and communicate with Township residents and businesses about different things that affect stormwater. If you have any additional questions, please contact Erin McPherson by email or 610-408-3617.


When Washing Your Car... [PDF]

Stormwater is Everybody's Business [PDF]

Don't Let Storm Water Run Off With Your Time and Money [PDF]

Protecting Water Quality from Urban Runoff [PDF]

When It Rains, It Drains [PDF]

Every Little Bit Helps [PDF]

You Can Curb Water Pollution by Starting in Your Own Back Yard [PDF - PSATS Township Today]