Reduction Credits

Summary of Reduction Credits Available
Property Type Total Percent (%) Reduction* in Impervious Area Fee Type of Impervious Area Treated by Best Management Practice or Environmental Site Design Percent (%) Reduction*
Single-family Residential, Multi-Family (apartments), or Condominium Up to 100%
Driveway or Parking Lot
All ‘Other’ Impervious Areas (sidewalks, sheds, patios, pool decks, etc.)
Up to 40%
Up to 50%
Up to 10%
Non-Residential- Environmental Site Design (Commercial, Industrial, Institutional)

Non-Residential- Legacy Ponds (commercial, industrial, institutional)
Up to 100%

Up to 100%
Driveway/Parking Lot
Green Lawn
Reforestation on pervious urban

Legacy ponds 
Up to 45%
Up to 45%
Up to 5%
Up to 5% 

*Non-Reduction for ponds built prior to 1985
*Up to 50% for ponds built between 1985-2002
*Up to 100% for ponds built post 2002
*Clean Water Act Fee reduction credits apply only to the Impervious Area Fee; the Administrative Fee of $20.58 per tax account per year still applies.