3.3. Steroids
Several endocrine active compounds were selected for a Tier III evaluation of effluent water quality. Similar to observations for other water quality parameters, no significant differences (p >0.05) were observed for steroid concentrations between weekday and weekend samples. Of the steroids examined, mean E1 (an E2 metabolite) concentrations were significantly higher (p < 0.05) than other steroids. Effluent levels of E1, E2, and T did not significantly differ between MTP and ATS effluent samples over the study period (p < 0.05; Fig. 4).