Several xenoestrogens such as nonylphenolethoxylate degradation products were detected as well. Nonylphenol and nonylphenol monoethoxycarboxylate concentrations, for example, ranged from 10–16 lg L1 to 7.8–8.2 lg L1, respectively. Similarly Conn et al. (2006), examined nonylphenolethoxylates, nonylphenolethoxycarboxylates and nonlyphenol in both anaerobic and aerobic onsite systems with median values ranging from 1.0 to 25 lg L1.