Figure 3.

P ^ill versus untreated wastewater concentration D showing expected (mean) probability ${\overline{P}}^{\mathrm{i}\mathrm{l}\mathrm{l}}$, median probability $P_{50\%}^{\mathrm{i}\mathrm{l}\mathrm{l}}$, and the EPA threshold $P_{\mathrm{E}\mathrm{P}\mathrm{A}}^{\mathrm{i}\mathrm{l}\mathrm{l}}=0.036$ (USEPA, 2012) as indicated in the legend.