Stormwater & MS4

What is MS4?

This page provides general information for residents who want to educate themselves about the MS4 program and understand the role we all play in keeping our water clean.


Middle Smithfield Township NPDES (National Pollutant Discharge Elimination System) and MS4 Programs (Municipal Separate Storm Sewer System)

Middle Smithfield Township NPDES Permit No. PAI132267


The Clean Water Act is the federal legislation that governs stormwater management. Stormwater point discharges to waters of the U.S. (pipes and drain pipes) are regulated using NPDES permits. In 1999, federal regulations extended coverage of the NPDES program to local separate storm sewer systems (MS4s) serving populations less than 100,000.


Middle Smithfield Township is required to comply with the NPDES program as aN MS4 municipality. Under the NPDES storm water program, permittees must develop a stormwater management plan that provides the details of how the community will comply with the requirements of the permit.


Permits are based on a framework of six minimum control measures:


  1. Public education and outreach
  2. Public participation and involvement
  3. Illicit discharge detection and elimination
  4. Construction site runoff control
  5. Post-construction storm water management in new development and redevelopment
  6. Pollution prevention and good housekeeping for municipal operations and maintenance


Middle Smithfield Township is actively involved in a variety of programs and initiatives to meet various statewide and national goals for clean water, but Township residents have a role to play too. Working together, we will have a positive impact on our environment, and the water that is so important to us all. We hope that you will find this information useful.


What is stormwater runoff?

Stormwater originates from rain or melting snow/ice that runs off surfaces such as rooftops, streets, construction sites, lawns, and fields. Stormwater runoff can pick up debris, chemicals, dirt, and other pollutants as it makes its way to storm drains and natural waterways.


Why should you care?

Stormwater from your home and from the public streets goes into a storm sewer, which goes directly into streams and bodies of water used for swimming, fishing, and providing drinking water. This water is not cleaned in any way and does not go to the waste water treatment plant. We all drink water, so we are all affected when our water is polluted. Streams and creeks feed into rivers, lakes and the ocean. If you like to fish, swim or boat, pollutants will affect you. When we pollute our water, everyone is affected!


What can you do to help?

Plant native trees & plants

Clean up after your pets

Use fertilizers properly and efficiently to prevent excess runoff

Store gasoline, oil, or other chemical materials indoors

Monitor stormwater inlets near your property

NEVER dump anything down the storm drain, in a stream, or other body of water


Quick Reference Links on Stormwater Management

PA Department of Environmental Protection (link to

U.S. Environmental Protection Agency (link to

MS4 Program (link to

Monroe County Conservation District (link to

Habits to Help – Reduce your Pet Waste (link to


Stormwater Appendix

Stormwater Ordinance 156