The samples are tested for nutrients, bacteria, inorganics, and selected metals. The springs are in the Bull, Shoal, Brushy, and Walnut Creek watersheds as well as Lake Austin. The pink areas are aquifer recharge zones in north and central Austin. Results from these programs indicate that urban springs in the NEA have increased nitrate-nitrogen, choride, sulfate, potassium, sodium, calcium, magnesium, and total organic carbon compared to rural springs. Dye tracing is underway to identify surface areas feeding springs in some of the urbanized areas of the aquifer.
Results are pending.
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