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Air Quality Purple Air Sensors
This dataset is made up of hourly measurements of PM2.5 and PM10, and meteorological measurements, collected through DOEE’s Purple Air network in the District of Columbia. The... -
Air Quality History
This dataset contains quality assured and DOEE-certified air quality data collected from the District’s five air monitoring network sites. The dataset covers a three-year period... -
Heat Sensitivity Exposure Index
This Index combines a Heat Sensitivity Index and a Heat Exposure Index allowing users to visualize which census tracts in DC are most heat sensitive and/or exposed. The Heat... -
Chesapeake Bay Watersheds
The dataset contains locations and attributes of HUC-11 watersheds. The USGS presents a detailed explanation of HUCs at https://water.usgs.gov/GIS/huc.html. HUC-11 boundaries... -
Storm Sewer System
The dataset contains locations and attributes of storm sewer systems including the combined sewersheds within the DC Water jurisdiction. There are small areas within this... -
Best Management Practices
Best Management Practices (BMPs) are structural controls used to manage stormwater runoff. Examples include green roofs, rain gardens, and cisterns. BMPs reduce the effects of... -
Combined Sewer Outfall Sewer Shed
DC Water operates a wastewater collection system comprised of "separate" and "combined" sewers. Approximately two-thirds of the District is served by a separate sewer system,... -
Air Quality Clarity Node Sensors
This dataset is made up of hourly measurements of PM2.5 and PM10, and meteorological measurements, collected through DOEE’s Clarity Node network in the District of Columbia. The... -
DC Subwatersheds
This layer depicts the conglomeration of the 4 layers used for TMDLs. It contains TMDL Subsheds, Direct Drain Overland (not piped), Direct Drain Sewersheds (piped), and Combined... -
Air Quality Realtime
Dataset is comprised of hourly air quality data points captured from the District’s air monitoring network sites. The dataset is quality controlled by a process of field data... -
MS4 Storm Sewer Outfalls
The dataset contains locations and attributes of the MS4 outfalls created as part of the Federal MS4 Permit. GPS outfall locations were captured by DC Water, then DC WASA in... -
MS4 Sewer Shed
The dataset contains locations and attributes of the drainage areas of MS4 outfalls. -
Rhode Island Avenue Metro Underpass Flood Hazard Area
On August 14, 2023, approximately 2 inches of rain fell in less than an hour at this location, flooding the underpass, stranding cars, and filling a pet daycare business with 6... -
Tidal Shoreline Flood Hazard Area
The tidal shoreline buffer includes the areas along the banks of the Potomac and Anacostia Rivers that are projected to be inundated by tides on a daily basis by 2080. These... -
DC Well Permits
Wells are defined by 21 DCMR Chapter 18 as any test hole, shaft, or soil excavation created by any means including, but not limited to, drilling, coring, boring, washing,...
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