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Will some evaporation rates inhibit a wetlands approach to drainage disposal? More importantly what dose of UV kills the target parasites? 1.0 mWs/cm2 at 20C? Cryptosporidium parvum oocysts are resistant to UV irradiation, requiring an extremely high dose of 230 mWs/cm2 for a 2-log10 reduction in excystation, which was used to assess viability. Moreover, the excystation ability exhibited only slight decreases at UV doses below 100 mWs/cm2.