SWM Plan

What's Changed

The new MS4 general permit effective July 2017 provides a great deal more detail on what has to be included in the Stormwater Management Plan. While this may increase the responsibilities of MS4 communities it also provides more clarity on what does or does not meet the standards for each Minimum Control Measure.


Comparison of Stormwater Management Plan for 2004 and 2017 Permit

  2004 Permit 2017 Permit
Who is covered? A municipality that owns and operates a storm sewer system in an Urbanized Area; based on the 2000 census A municipality that owns and operates a storm sewer system in an Urbanized Area; based on the 2010 census (New: Brooklyn, Haddam, Killingly, Mansfield, New Hartford, Plainfield, Sprague, and Willington). Also includes state and federal institutions such as prisons, colleges, hospitals, and military facilities.
Public Education & Outreach Requires public education program to distribute educational materials or conduct outreach activities Additionally: Specifies what topics public education should target. Specifies how outreach materials can be distributed. Adds a timeline for implementation of this program.
Public Involvement Requires compliance with Freedom of Information Act. Requires development of a public participation plan for the Stormwater Management Plan. Additionally: Specifies where/when to post notice of the availability of the Stormwater Management Plan and Annual Report for public review
IDDE Requires implementation of a regulatory mechanism to prohibit illicit discharges Requires mapping of the urbanized area; includes pipes >15" diameter Additionally: Specifies where to look for illicit discharges. Requires citizen reporting program. Requires a more specific legal authority. Adds a timeframe. Additionally: Requires all pipes to be mapped, as well as all cross connections
Construction Requires program to reduce construction runoff pollution Additionally: Provides more detail about the legal authority required. Requires consistency with Stormwater Quality Manual in addition to the 2002 Guidelines for Soil Erosion and Sedimentation Control. More detail is provided for construction review and inspection, notification of requirements of the DEEP construction general permit, public involvement and long-term maintenance of stormwater treatment ponds. Requires MS4 to plan how all related departments and boards will coordinate with each other.
Post Construction Implement program to address stormwater runoff from new or redeveloped projects, and create a legal authority. Implement appropriate BMPs, and ensure long term maintenance. Additionally: Requires LID measures to be used, as well as other elements from the construction general permit. MS4 is required to map its Directly Connected impervious Area (DCIA).
Pollution Prevention/Good Housekeeping Employee training; park & open space maintenance, fleet & building maintenance, new constructions & land disturbances, stormwater system maintenance; streetsweeping; catch basin cleaning; repair/upgrade MS4 structures/outfalls when necessary Additionally: Timelines for all parts; more specific parks/open space procedures; pet waste management; waterfowl management; specific buildings and facilities procedures; specific vehicle and equipment procedures; leaf management; specific catch basin cleaning instructions; snow management practices; interconnected MS4 coordination; additional measures for impaired waters