EPA MS4 Program Information

The National Pollutant Discharge Elimination System (NPDES) Phase II stormwater program requires that Municipal Separate Storm Sewer System (MS4s) address the six required elements contained in the federal regulations to reduce water pollution:

Public Education and Outreach 

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Municipal Operations and Maintenance 

Public Participation and Involvement 

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Illicit Discharge Detection and Elimination 

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Construction Site Runoff Control 

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Post-Construction Stormwater Management and Redevelopment 

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Pollution Prevention/Good Housekeeping for Municipal Operations and Maintenance

Don't Blow Your Grass Into The Streets.p

Additional Educational Material

For Protecting Streams


20 Ways to Protect Your Stream & Streamside Property
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When it Rains
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Keep Car Washing from Harming Our Streams
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Fertilizer Informational Flyer
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PA DEP Stormwater Management

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Helpful Links

  EPAs NPDES Permit Program Basics

EPAs NPDES Stormwater Program

EPAs Municipal Stormwater Resources

(NPDES Stormwater Discharge form MS4s)

Pa DEP’s Stormwater Management Home Page


United States Environmental

Protection Agency Links


EPA Home:

EPA A-Z Index:


EPA NPDES Stormwater Programs:


EPA Municipal Stormwater Resources:


EPA Stormwater BMP Menu:

Ridley Township
Citizen Water Quality Hotlines

Sanitary Sewer Backups & Overflows or Illegal Dumping
Ridley Township (Mon. to Fri. 8:30 am to 4:30 pm)
After Hours Dial 9-1-1

Spills, Leaks, Creek Contamination
DEP Water Quality Hotline

Fisk Kills, Illegal Fishing
PA Fish Commission

Water Main Breaks
Aqua, PA

Construction Site Erosion & Sediment Discharge
Delaware County Conservation District

  Stormwater Management Ordinance

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