TABLE 2.

Percentage of samples with detectable indicator organisms and pathogens

Indicator or pathogen% of samples positive in each stagea
InfluentBiological treatmentFilter effluentDisinfected effluent
Indicators
    Total coliforms1001009463
    Fecal coliforms100976527
    Enterococci100948427
    Clostridium perfringens93867961
    Coliphages on 15597100978338
    Coliphages on 700891100938045
Pathogens
    Enteric viruses100735831
    Giardia100948880
    Cryptosporidium
        Total oocysts74847170
        Infectious oocysts32191920
  • a Data from all sampling events at the six facilities were pooled for each treatment step.