Antibiotic Concentrations Decrease during Wastewater Treatment but Persist at Low Levels in Reclaimed Water.

In general, concentrations of most antibiotics were lower in the effluent samples compared to influent samples, with differences (at marginal significance) between influent and effluent concentrations observed only for oxacillin (W = 54, p -value = 0.004) and pipemidic acid (W = 53, p -value = 0.006).

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These differences provided evidence of an overall trend of decreasing azithromycin concentrations as effluent flowed from WWTP1 and was subsequently stored at the spray irrigation site.

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