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Fecal coliforms

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A lot can be said about fecal coliforms. Basically they're a pollutant that is found in sewer discharges in large quantities.


  • typical concentrations at a local discharge: 1e7 to 1e8 coli/100 mL
  • typical discharge flow: 1 m3/s per 250,000 inhabitants. Guia de Cascais is 2 m3/s.
  • typical decay time (decimation):
    • Summer sunny day: 30 min
    • Night: 24h
    • Average: 2 h
  • Clean bathing water treshold issued by the European Bathing Water Directive: 100 coli/100 mL