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The City of San Antonio and the surrounding municipalities in Bexar County, Texas, are among the fastest growing cities in the Nation (U.S. Census Bureau, 2013). Increases in residential and commercial development are changing runoff patterns and likely will increase chemical loads into streams (Ockerman and McNamara, 2003). The U.S. Geological Survey (USGS), in cooperation with the San Antonio River Authority (SARA), evaluated the concentrations and distributional patterns of selected “compounds of emerging concern” (CECs) by collecting and analyzing waterquality samples from 20 sites in the San Antonio River Basin, Tex., during 2011–12. On the basis of their chemical composition or similar uses, the CECs discussed in this fact sheet are wastewater compounds, pharmaceutical compounds (hereinafter referred to as “pharmaceuticals”), and steroidal hormone and sterol compounds (hereinafter referred to as “steroidal hormones and sterols”). The locations of the sampling sites (map identifiers EC01–EC20) are depicted in figure 1, along with graphs showing the analytical results during the first of three synoptic sampling events for a subclass of the wastewater compounds.

Compounds of emerging concern in the San Antonio River Basin, Texas, 2011–12