20230507 11241400 1.0 TRUE Impervious 2011 Gwinnett County Department of Water Resources, Stormwater Management. Stormwater Service Fee bills are based on the square feet amount of impervious area represented in polygons. The total impervious area for each parcel is summed and then the billable impervious area is rounded down to the next lowest 100 sq feet for billing purposes. The billing rate in 2006 was $0.77 per square ft; in 2007 was $1.41/sq ft; in 2008 was $2.01/sq ft; in 2009 was $2.46/sq ft; in 2010 was $2.46/sq ft; in 2011 was $2.46 per 100 sq ft. swservice@gwinnettcounty.com