Connecticut MS4 Supporting Layers

 

The 2017 Municipal Separate Storm Sewer System (MS4) General Permit regulation includes several mapping requirements. New and existing statewide data layers are compiled here to assist municipalities and institutions in complying with the permit requirements.

CT MS4 Viewer

The CT MS4 Viewer includes data layers that are helpful in registering for and complying with the 2017 CT MS4 General Permit.

 

Layer Information

 Data Guide Metadata Download Map Services (click on Built Environment)

CT 2012 Impervious Surface
(more info)

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Impervious: Impervious_2012*
Impervious: Impervious_2012_StatePlane*,
Impervious: Impervious_2012_simplfied_vector_StatePlane
CT 2020 Stormwater Impaired Waters
(Rivers, Lakes, Estuaries)

MS4_layers: CT2020_Impaired_Rivers
MS4_layers: CT2020_Impaired_Lakes
MS4_layers: CT2020_Impaired_Estuary
CT 2018 Stormwater Impaired Waters
(Rivers, Lakes, Estuaries)

MS4_layers: CT2018_Impaired_Rivers
MS4_layers: CT2018_Impaired_Lakes
MS4_layers: CT2018_Impaired_Estuary

CT 2016 Stormwater Impaired Waters
(Rivers, Lakes, Estuaries)



MS4_layers: CT2016_Impaired_Rivers_V2
MS4_layers: CT2016_Impaired_Lakes_V2
MS4_layers: CT2016_Impaired_Estuary_V2

CT DEEP Basins with 2012 Impervious Stats

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MS4_layers: Impervious Cover by Watershed Basin
CT DEEP Basins (clipped to town boundaries) with 2012 Impervious Stats -

MS4_layers: Impervious Cover by Watershed Basin (Clipped)

CT Towns with 2012 Impervious Stats

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MS4_layers: Impervious Cover by Town

CT MS4 Urbanized Area

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MS4_layers: Urbanized Area

CT MS4 Towns

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MS4_layers: MS4 Towns

 

*Impervious_2012 in is the Web Mercator Auxiliary Sphere Coordinate system while the Imperivous_2012_StatePlane service is in Connecticut State Plane NAD83 Feet. See the Coordinate Systems page for more information.