Stormwater Solutions

Stormwater Solutions

A recognized leader in Stormwater Compliance since 2002, RES provides Erosion & Sediment (E&S) Control and stormwater management (SWM) solutions. We provide the full suite of SWM solutions including permitting and inspection of active and post-construction sites, maintenance and retrofit of stormwater ponds, and routine maintenance of other SWM Best Management Practice (BMP) facilities.

Our experience includes assisting clients with Construction General Permits (CGP) in North Carolina, Virginia, and Maryland, among other locations. For compliance with the CGP, all structural and non-structural stormwater controls are inspected and documented on a routine basis. Clients include the development, utility, and transportation industries.

Key regulations directing our compliance efforts include:

  • National Pollutant Discharge Elimination System (NPDES)
  • Virginia Stormwater Management Act
  • Virginia Stormwater Management System (VSMP)
  • Virginia Erosion and Sediment Control Law
  • Virginia Pollutant Discharge Elimination System (VPDES)

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Green Infrastructure

Rivers, streams, wetlands, floodplains, and forests provide a suite of critical services like clean water and flood protection, and are essential and effective components of our water infrastructure. Green infrastructure is effective, economical, and enhances community safety and quality of life. It means planting trees and restoring wetlands, rather than building a costly new water treatment plant.


  • Wetland Restoration
  • Stream Restoration
  • Riparian Planting
  • Buffer Planting
  • Rain Gardens
  • Permeable Pavements
  • Bioswales
  • Infiltration Planters

TMDL and MS4 Compliance Solutions

Over 100 million acres of developed land exists across the U.S. today. Over one quarter of this developed space has been converted to impervious cover including rooftops, streets, highways, roads, driveways and parking lots generating high amounts of stormwater runoff that makes its way into receiving waters. 

RES helps communities comply with the Total Maximum Daily Load (TMDL) limits on pollutants that affect clean and safe drinking waters. Municipal Separate Storm Sewer System (MS4) Permit Compliance solutions address water quality, flooding, and ecological challenges from excess stormwater runoff -- by using nature as a solution in addition to existing gray infrastructure.


  • Green Stormwater Infrastructure
  • Nutrient Load Reduction
  • Stream Restoration
  • Wetland Restoration
  • Land Use Conversion

BMP Inspection and Maintenance

Federal, State, and Local laws regulate BMP inspection and maintenance of existing stormwater management BMP (Best Management Practice) facilities. As rigorous enforcement procedures are steadily gaining approval, owners of these facilities should protect themselves against a penalty, fine, or Notice of Violation (NOV) that can be easily avoided. RES supplies BMP Inspection and Maintenance solutions including annual or biannual BMP inspections of stormwater management (SWM) facilities for compliance with these regulations. With in-house resources including professional engineers, certified E&S inspectors, certified SWM inspectors, and ecological construction crews, we monitor and maintain all types of BMPs for long-term, pro-active compliance with local, State, and Federal regulation.

The RES team’s experience in both the design and construction of SWM structures enables us to provide practical and low maintenance solutions for BMP facilities after construction has ended. For existing SWM BMP facilities, we provide annual inspections, routine maintenance, and large scale retrofit services to ensure proper function and long-term compliance.

BMP Types

  • Traditional Stormwater Ponds (Wet or Dry)
  • Bioretention Facilities/Raingardens
  • Created Wetlands
  • Sand Filters
  • Open-Space Buffers
  • Underground Systems

BMP Services

  • BMP Inspection and Maintenance
  • BMP Repair
  • Erosion Control
  • Pipe Replacement
  • Pond Infrastructure Repair
  • Outfall Repair
  • Landscaping & Mowing
  • Debris Removal

NPDES Inspections

RES provides NPDES Inspection services to ensure our clients’ compliance with federal and state regulations regarding point source discharges of pollutants.  This includes the National Pollutant Discharge Elimination System (NPDES), as well as state-specific regulation such as the Virginia Pollutant Discharge Elimination System (VPDES), formally known as the Virginia Stormwater Management Program (VSMP).

Once land disturbance is initiated, our NPDES Inspections regularly assess the condition of structural onsite controls, such as silt fencing, inlet protection, sediment basin function, etc., as well as non-structural controls such as hazardous materials housekeeping, training of personnel, placement of portable toilets, and the stabilization of disturbed areas, etc. Our team of Erosion and Sediment (E&S) control/NPDES inspectors, all certified by the Virginia Department of Environmental Quality (DEQ) above minimum requirements, has meticulously distinguished itself from other inspection providers through sincere dedication to a higher level of oversight.

Our response to market demands, innovations including in-the-field printing, and top-notch quality inspections have grown the RES NPDES Inspections program to include projects in Virginia, North Carolina, Maryland, West Virginia, New Jersey, South Carolina, Pennsylvania, Delaware, Florida and the District of Columbia.

NPDES Inspection Services

  • Permit Registration
  • Stormwater Pollution Prevention Plan (SWPPP) Preparation
  • VSMP/NPDES Third-Party Inspections
  • In-the-field Printing, Scanning & Internet Capabilities for SWPPP Maintenance
  • Active Site Audits for E&S control
  • Total Maximum Daily Load (TMDL) Compliance
  • Compliance Resolution

Case Studies