Due to continued rapid growth, Gwinnett County, Georgia, is projected to experience peak day demands in excess of their permitted 150-million gallons per day (mgd) treatment capacity over the next several years. Although the county has begun construction of a plant which will provide an additional 75-mgd of treatment capacity, it will not be completed until early 2004. This paper describes how the county, while facing the possibility of being unable to meet peak water demands, developed a strategy for using finished water storage for multi-day averaging of peak demands. Since a large number of Gwinnett County residents commute out of the county to work, peak demands are typically seen during the weekends, and have historically been as high as 1.68 times the average annual day demand. An analysis was completed to determine the frequency and distribution of peak days to decide if using dedicated storage for multi-day averaging of the peak demands was a feasible alternative. The total storage needed to equalize demand for anticipated periods where demand exceeded available 150-mgd plant production was calculated. The analysis showed that a volume of 40 million gallons (MG) of projected multi-day averaging storage (MDAS) would allow the county to meet anticipated peak demand periods until 2004. Two fast-track projects were undertaken in order to provide this reserve MDAS storage. The first was the construction of two 10-MG ground storage tanks and a booster station. A second project involved the construction of a new 20-MG clearwell and a transfer pump station at the existing water treatment plant. These two projects effectively increased the county's ability to meet an additional demand equivalent to 18-mgd above their current production through multi-day averaging of demands during peak demand periods. Using MDAS was found to be an economical option, with the combined cost for these two projects at approximately $18 million. The additional effective water production capacity is provided at a cost of approximately $1.00 per gallon of equivalent treatment capacity, which compares favorably to construction of additional water treatment production capacity. Most importantly, since these smaller projects could be designed, permitted, and constructed much more rapidly than constructing additional treatment capacity, the county was able to implement them much faster and continue to supply the rapidly growing county population. Includes 2 references, tables, figures.