20180502 09520300 1.0 FGDC CSDGM Metadata TRUE <p>Summary: The purpose of this data is to display county and cities within Region 3 that have MS4 Phase I permits assigned to them (less the municipality areas that are covered by Phase II permits). Development of this data utilized existing data depicting county boundaries and city/town/incorporated boundaries. Counties that had MS4 Phase I permits assigned to them were used to represent MS4 Phase I covered area for the states of Maryland, Delaware, and Virginia. Incorporated places and towns that house there own Phase II permits were extracted from this layer for the states of Delaware and Maryland. The two Phase I permits assigned to cities in Pennsylvania were delineated using administrative boundary data for the state of Pennsylvania. Modifications for Virginia counties and independent cities were not necessary. County boundary data (original metadata below) was used as the starting point for this data layer, and municipal boundary data from multiple states were utilized during the development of this data layer. County Boundaries - Original Metadata: The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. The primary legal divisions of most States are termed counties. In four States (Maryland, Missouri, Nevada, and Virginia), there are one or more incorporated places that are independent of any county organization and thus constitute primary divisions of their States. These incorporated places are known as independent cities and are treated as equivalent entities for purposes of data presentation. The District of Columbia and Guam have no primary divisions, and each area is considered an equivalent entity for purposes of data presentation. Description: Polluted stormwater runoff is commonly transported through Municipal Separate Storm Sewer Systems (MS4s), from which it is often discharged untreated into local waterbodies. To prevent harmful pollutants from being washed or dumped into an MS4, operators must obtain a NPDES permit and develop a stormwater management program.Phase I, issued in 1990, requires medium and large cities or certain counties with populations of 100,000 or more to obtain NPDES permit coverage for their stormwater discharges.There are approximately 750 Phase I MS4s.Phase II, issued in 1999, requires regulated small MS4s in urbanized areas, as well as small MS4s outside the urbanized areas that are designated by the permitting authority, to obtain NPDES permit coverage for their stormwater discharges. There are approximately 6,700 Phase II MS4s. Generally, Phase I MS4s are covered by individual permits and Phase II MS4s are covered by a general permit. Each regulated MS4 is required to develop and implement a stormwater management program (SWMP) to reduce the contamination of stormwater runoff and prohibit illicit discharges.WHAT IS AN MS4?An MS4 is a conveyance or system of conveyances that is:- Owned by a state, city, town, village, or other public entity that discharges to waters of the U.S.;- Designed or used to collect or convey stormwater (including storm drains, pipes, ditches, etc.);- Not a combined sewer; and - Not part of a Publicly Owned Treatment Works (sewage treatment plant). County Boundaries - Original Metadata:The Dynamap(R)/2000 County Boundary file is a non-generalized polygon layer that represents all U.S. government-defined entities named County. A County is a type of governmental unit that is the primary legal subdivision of every U.S. state. In Maryland and Virginia, there are one or more incorporated places that function as County equivalents. These are known as 'independent cities.' All states that border the Atlantic Ocean or The Great Lakes will have two sets of boundaries. One, the shoreline boundary, the other the political boundary. This boundary set will extend to the political boundary of the state. These boundaries are referred to as "with shoreline buffer".</p> Municipal Separate Storm Sewer SystemMS4StormwaterWPDStormsewerUrban AreasRunoffNPDES permitsPhase ItraditionalCountiesWest VirginiaWVMarylandMDPennsylvaniaPAVirginiaVADistrict of ColumbiaD.C.CountyRegionREG 03Boundaries and Base Data This web service presents polygons depicting Municipal Separate Storm Sewer System (MS4) Phase I permits for county and cities within EPA Region 3 U.S. EPA Region 3, TeleAtlas, Census Bureau This data layer represents the best availavle depiction of MS4 Phase I permitted area for Region 3. Becuase this data layer was derived from existing data layers of multiple resolutions, accuracy may not be exact. 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