Identify Your Watershed and Sewer System Area App

This app displays a series of general information for an address, location, or where the user clicks in DC. Some information returned are:Municipal Separate Storm Sewer System (MS4) areaCombined Sewer System (CSS) areaWatershed, Subwatershed, HUC12, HUC14, HUC16Ward, ANC, SMD, and the address of the locationCensus Tract and zip code For addresses along the borders of watersheds and sewer areas, further investigation should be taken.  For hydrologic calculations and determinations, the USGS Watershed Boundary Dataset (WBD) should be referenced.DC Water operates a "separate" (MS4) and "combined" (CSS) sewers. Since the early 1900's, sewers constructed within the District have been separate systems and no new combined sewer systems have been built.  These two independent piping systems: CSS mixes "sanitary" (sewage from homes and businesses) with stormwater while the MS4 is for "stormwater" only.  In the District, approximately two thirds of the District is served by the MS4. The remaining one-third is served by the CSS.Areas highlighted in blue are MS4, in orange are CSS, and in green are direct drain areas that drain directly to streams and rivers.The MS4 system discharges into portions of the Potomac, Anacostia and Rock Creek drainage areas.  The CSS drains to Blue Plains Advance Wastewater Treatment Facility.Visit DOEE - Water in the District Page or DOEE Environmental Mapping.For the USGS Hydrologic and Watershed Boundary Data for DC, visit this Link.https://dcgis.maps.arcgis.com/home/item.html?id=54da82ed8d264bbbb7f9087df8c947c3

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