Trend Analysis of Water Quality Monitoring Data for Cobb County, GA
Bourne, Robert L.
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The Cobb County Water Protection Division Water Quality Laboratory has conducted quarterly chemical monitoring from 1995-2005. Here we analyze these data for temporal trends at 45 sites in 10 Piedmont streams in the Chattahoochee and Etowah river basins. The strongest overall trend was for increases in conductivity, chlorides, TKN, and NOx. Some sites showed a decrease in turbidity, TSS, and percent dissolved oxygen saturation. To the extent that the changes in water quality have resulted from land use change and increasing urbanization and development in the watershed, the best indicators of land use change in Cobb County may be conductivity and TKN. This dataset provides a unique opportunity to examine water quality trends for a rapidly developing region of Georgia.