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The National Pollutant Discharge Elimination System (NPDES) regulations for municipal separate storm sewer systems are federal regulations administered nationwide by the Environmental Protection Agency.   Phase I of the program was applicable to large municipal separate storm sewer systems. Under Phase II of this program, regulations are applicable to small municipal separate storm sewer systems (MS4s).

The goal of this program is to limit the amount of pollutants entering our streams and lakes through separate storm sewer systems. A separate storm sewer system is a stormwater collection and conveyance system (inlets, piping, swales, gutters, detention ponds, outlets, BMPs) that is intended to carry only stormwater runoff. Separate storm sewer systems are not combined with sanitary sewer systems and generally discharge directly to a stream. The MS4 program requires regulated municipalities to develop and implement a stormwater management program that addresses six Minimum Control Measures (MCMs) for municipally owned or operated systems.  The MCMs are:

1.   Public Education
2.  Public Participation
3.  Illicit Discharge Detection and Elimination
4.  Construction Site Stormwater Management
5.  Post-Construction Stormwater Management
6.  Pollution Prevention and Good Housekeeping at Municipal Facilities

In Pennsylvania, the MS4 program is administered by DEP. The Dauphin County Commissioners designated DCCD as the agency responsible for ensuring that the county is in compliance with the terms of its permit. The Conservation District has developed a plan to meet the six requirements listed above.  

Public input, comments and suggestions on the MS4 Implementation Plan or other stormwater related issues is welcome.  Copies of the plan, annual report and attachments are available on this website (see below), at the Conservation District office, or by mail upon request.

Comments or requests can be:

emailed to:        Bob Christoff at

mailed to:          Dauphin County Conservation District

                          1451 Peters Mountain Road

                          Dauphin  PA  17018

Or phone at:      717-921-8100

DEP's Stormwater Management Webpage

Dauphin County's 2023-2024 MS4 implementation plan

2022-2023 Annual Report Form     (contact Bob Christoff as shown above for 
                                                         attachments and other documentation)

DEP 2022 Model SWM Ordinance

National Pollutant Discharge Elimination System (NPDES)
Regulations for Municipal Separate Storm Sewer Systems (MS4s)

1451 Peters Mountain Road Dauphin PA 17018 phone: 717-921-8100