IMPERVIOUS

IMPERVIOUS

SURFACES RETROFITTED, ACRES

The County has been tracking the retrofitting of impervious surfaces since 2016 to comply with the National Pollutant Discharge Elimination System (NPDES)/

stormwater discharge (MS4) permit and Watershed Implementation Plan (WIP) mandates.

The NDPES permit is authorized by the Environmental Protection Agency to be managed by the Maryland Department of the Environment.

Between 2017 and 2019, 2,992 acres of impervious areas were retrofitted with stormwater controls.

The County is required to retrofit 20 percent (6,105 acres) of untreated impervious surfaces within the FY 2017-FY 2023, five-year NPDES/MS4 permit cycle.

For the current cycle, factors affecting this performance measure include filling existing vacancies,

availability of private property opportunities, procurement and permitting issues, land acquisition/easements,

construction, and annual funding commitments.

The Clean Water Act Fee, collected by Prince George’s County, is being used for the Clean Water Partnership (CWP) and other projects across the County to replace impervious surfaces with stormwater Best Management Practices (BMPs).

According to CWP, 2,419.93 impervious acres have been retrofitted with BMPs since 2015.

As suggested by NE 2.5, the County and outside agencies coordinate to reduce impervious surfaces

by implementing and maintaining BMP projects throughout their 30- year lifecycle as approved by the Department of Environment.

The CWP is a Design-Build-Operate-Maintain community-based public-private partnership (CBP3) business model contract between

the County and private partner Corvias Prince George’s County Stormwater Partners LLC.

The actions taken to date appear to be having a positive effect as the acres Per Plan 2035, stormwater runoff is generated when precipitation from rain

and snow flows over land or impervious surfaces and does not percolate into the ground.

 As the runoff flows over these surfaces, such as paved streets, parking lots and other building rooftops,

 it accumulates debris, chemicals, sediment, and other pollutants that harm County streams and waterways if the runoff is not treated.

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