Bacteria in the hudson river
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Bacteria in the Hudson River PowerPoint PPT Presentation

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Bacteria in the Hudson River. Enterococci as microbial indicators of pathogens. Where does bacteria come from?. Untreated wastewater (CSOs) Improper boat waste disposal Animal and wildlife waste Stormwater runoff. Enterococci.

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Bacteria in the Hudson River

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Bacteria in the Hudson River

Enterococci as microbial indicators of pathogens

Where does bacteria come from?

  • Untreated wastewater (CSOs)

  • Improper boat waste disposal

  • Animal and wildlife waste

  • Stormwater runoff


  • Bacteria from the intestines of humans and other warm-blooded animals

  • Used by the EPA as federal standard to indicate presence of pathogens

  • Pathogens indicated by presence of enterococci can cause gastrointestinal disease in humans


  • NYC sewer system- 6000 miles of sewer pipes

  • 14 water treatment plants throughout NYC

  • NYC produces ~1.4 billion gallons of wastewater per day

North River Wastewater Treatment Plant

Capacity: 170 million gallons per day

125 mgd, dry weather

340 mgd, wet weather

Combined Sewer Overflow

  • Combined sewer system (CSS)=

    combination of street drains and household and industrial wastewater

  • 494 outfalls in New York City

  • EPA: CSO Control Policy

    • separate underground pipes for sewage and stormwater

    • keep combined pipes, increase capacity

Outfall at West 129th Street

Water Quality Standards

  • EPA enterococci standards

    • In Marine waters for bathing, 35 CFU/100mL

    • Ingestion of contaminated shellfish or surface water can cause gastrointestinal disease


New method of testing enterococci by Idexx

Laboratories using a nutrient indicator that

fluoresces when metabolized by the bacteria


Similar technology in which nutrient indicator turns yellow when metabolized by coliforms, and flouresces when metabolized by E.Coli.

Other Measurements

  • Precipitation, turbidity, temperature, tides, suspended matter, organic/inorganic matter, and salinity are monitored along with enterococci, total coliform, and E.Coli.

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