Municipal Separate Storm Sewer Systems (MS4)

What is an MS4?

MS4 stands for Municipal Separate Storm Sewer Systems.  It refers to a conveyance or system of conveyances that is owned by a state, city, town or other public entity, that discharges to the waters of the U.S. and is designed to collect or convey stormwater (including storm drains, pipes, ditches, etc.).  It does not include combined sewers and is not part of a publicly owned treatment works (wastewater treatment plant).

The MS4 Program is an unfunded, federally mandated program that requires municipalities to take measures to reduce pollutants in storm water runoff to improve water quality.  The City of Huntington is a Phase II community under this program and is required to comply with the associated rules of the Indiana Administrative Code (327 IAC 15-13).

The MS4 is permitted under the National Pollutant Discharge Elimination System (NPDES) program through the Indiana Department of Environmental Management (IDEM).  MS4 permits are granted in five-year cycles at the end of which the permit must be renewed.


The City of Huntington must effectively and economically manage and protect its stormwater conveyance system in order to improve stormwater runoff water quality and help protect surrounding waterways.  This is accomplished through the City's Storm Water Quality Management Plan (SWQMP) and the MS4 Program's six (6) minimum control measures (MCMs):

MCM 1: Public Education and Outreach

MCM 2: Public Involvement and Participation

MCM 3: Illicit Discharge Detection and Elimination

MCM 4: Construction Site Runoff Control

MCM 5: Post-Construction Storm Water Management

MCM 6: Pollution Prevention and Good Housekeeping at Municipal Operations

To learn more, please visit the links below:



"After the Storm" brochure, EPA,

"Be the Solution to Stormwater Pollution" brochure, EPA,

"Protecting Water Quality from Urban Runoff" brochure, EPA,


For additional information about the EPA Stormwater and MS4 Programs, please visit:

U.S. EPA Stormwater Program website, EPA,

"After the Storm" website, EPA and The Weather Channel,  

IDEM Storm Water Permitting website,

U.S. EPA Nitrogen and Phosphorus Pollution website,

IDEM Watersheds and Nonpoint Source Water Pollution website,

Contact Us

Adam Cuttriss, Director of Public Works and Engineering Services
300 Cherry St
Huntington, IN 46750

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