Commercial properties exclude single and two-family dwellings and are billed at the rate of $309.79 per impervious acre per quarter, plus a $6.77 customer charge per quarter. The following actions can be undertaken to receive credits on the quarterly stormwater bill.
Commercial Credit Options
Community Partners for Clean Streams - This is a voluntary cooperative program with the Washtenaw County Drain Commissioner's Office to help identify practical, cost effective ways to protect Washtenaw County waterways through pollution prevention. CPCS is a cost-free initiative that provides information, technical advice and recognition to participants. For more information, see www.ewashtenaw.org/cpcs. To apply for this program, please contact Michelle Bononi at (734) 222-6833 or email bononim@ewashtenaw.org.
- This option reduces the customer charge by 17.3%, or $1.09 per quarter
Chapter 63 Compliant Stormwater Control - Locations may be able to install a stormwater management system that meets the standards outlined in Chapter 63 (Stormwater Management) of the City Code. This option is potentially also a credit option for one- and two-family residences. For more information, email storm@a2gov.org.
- This option reduces the customer stormwater discharge rate by 19.5% and the customer charge by 19.5%.
Vegetated Swales and Filter Strips
Infiltration and Percolation Basins and Trenches
Porous Pavement
Extended (Dry) Detention Basins
Retention (Wet) Ponds
Constructed Wetlands
Media Filtration, and
Other Stormwater Treatment System
- This option reduces the stormwater discharge rate by 6.4% and the customer charge by 17.3%.
Flood Risk Primer (pdf) - Background information on flood risks
Best Management Practices for Stormwater: A Developer's Guide for Ann Arbor (pdf) - Provides practical suggestions for the design of creek-friendly stormwater management facilities.
Local Resources
Office of the Washtenaw County Drain Commissioner
State Resources
Michigan Stormwater Floodplain Association
Michigan Department of Environmental Quality
National Resources
Center for Watershed Protection
Environmental Protection Agency
Updated July 1, 2008