Environmental samples sequenced in this study.

1Geometric mean +/− standard deviation of samples collected by SCCWRP at three sites along the beach (Figure 1) at 8am using USEPA1600.*Based on posted results from health department, which utilized USEPA Method 1600 to detect CFU/100 mL. On the 25th, all water quality samples were >104 CFU/100 mL, whereas the other days were more variable as illustrated in the standard deviation of the SCCWRP results.2MPN/100 g sand, calculated by SCCWRP from a single sample collected on the beach by SCCWRP using the IDEXX Enterolert assay.3Calculated by E. Halliday using USEPA Method 1600 for water and modified for sands as previously described [51], normalizing CFU to dry weight sand.