Bather Shedding

For studying bather shedding as a potential source of FMPs, surf zone water samples were collected on high visitation weekends or holidays (Jul 3rd, Aug 12th, and Sep 4th, 2017) during the morning and afternoon. Surf zone waters were also sampled at site G03 at different times of the day (late afternoon, and again in the early morning and mid-afternoon of the following day) on five occasions for evaluating if water defecation was occurring by potential campers overnight (Supplementary Table 6). During bather shedding studies, the counts of people were grouped into people “in the water” including swimmers or anyone recreating in the surf zone (bather), and people “on the sand,” meaning people recreating but not in the water (i.e., walking, sitting on the sand, and exercising).