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In June 2023, we launched our Water Watchdog Weekly Bacteria Monitoring Program for the Lower Susquehanna River Watershed. The purpose of this program is to inform people when popular public river/creek accesses are safe for recreating, or not.

 

Although we hope that water quality is safe all the time, that’s simply not the case especially during weather events when bacteria may enter streams and rivers through sewage overflows, improper treatment of waste, runoff of animal waste, and other ways. We measure E. coli counts using the IDEXX colilert 18 method.

During the recreational season Memorial Day through Labor Day, we conduct weekly monitoring. Every Thursday our team collect samples at 15 sites throughout the watershed. We post results every Friday on this webpage, our Facebook & Instagram pages and on the SwimGuide App.

2025 Results:

2025 Results:

  • 12 - Swatara Creek-05222025-E.png
    5-Codorus-05222025-E.png
    4-Yellow Breeches-05222025-E.png
    3-Dauphin County-05222025-E.png
    2-Lancaster County-05222025-E.png
    1-York County-05222025-E.png
    6-Susq & Lake Clarke-05222025-E.png
    7-Lake Aldred-05222025-E.png
    8-Conestogas-05222025-E.png
    10 - Muddy Creek-05222025-E.png
    11- City Island-05222025-E.png
    9- Pequea Creek-05222025-E.png
  • 12 - Swatara Creek-05292025-E.png
    5-Codorus-05292025-E.png
    4-Yellow Breeches-05292025-E.png
    3-Dauphin County-05292025-E.png
    2-Lancaster County-05292025-E.png
    1-York County-05292025-E.png
    6-Susq & Lake Clarke-05292025-E.png
    7-Lake Aldred-05292025-E.png
    8-Conestogas-05292025-E.png
    9- Pequea Creek-05292025-E.png
    10 - Muddy Creek-05292025-E.png
    11 - City Island-05292025-E.png
  • 12 - Swatara Creek-06052025-E.png
    5-Codorus-06052025-E.png
    4-Yellow Breeches-06052025-E.png
    3-Dauphin County-06052025-E.png
    2-Lancaster County-06052025-E.png
    1-York County-06052025-E.png
    6-Susq & Lake Clarke-06052025-E.png
    7-Lake Aldred-06052025-E.png
    8-Conestogas-06052025-E.png
    9- Pequea Creek-06052025-E.png
    10 - Muddy Creek-06052025-E.png
    11 - City Island-06052025-E.png
  • 12 - Swatara Creek-06122025-E.png
    5-Codorus-06122025-E.png
    4-Yellow Breeches-06122025-E.png
    3-Dauphin County-06122025-E.png
    2-Lancaster County-06122025-E.png
    1-York County-06122025-E.png
    6-Susq & Lake Clarke-06122025-E.png
    7-Lake Aldred-06122025-E.png
    8-Conestogas-06122025-E.png
    9- Pequea Creek-06122025-E.png
    10 - Muddy Creek-06122025-E.png
    11 - City Island-06122025-E.png
  • 12 - Swatara Creek-06192025-E.png
    5-Codorus-06192025-E.png
    4-Yellow Breeches-06192025-E.png
    3-Dauphin County-06192025-E.png
    2-Lancaster County-06192025-E.png
    1-York County-06192025-E.png
    6-Susq & Lake Clarke-06192025-E.png
    7-Lake Aldred-06192025-E.png
    8-Conestogas-06192025-E.png
    9- Pequea Creek-06192025-E.png
    10 - Muddy Creek-06192025-E.png
    11 - City Island-06192025-E.png
  • 12 - Swatara Creek-06262025-E.png
    5-Codorus-06262025-E.png
    4-Yellow Breeches-06262025-E.png
    3-Dauphin County-06262025-E.png
    2-Lancaster County-06262025-E.png
    1-York County-06262025-E.png
    6-Susq & Lake Clarke-06262025-E.png
    7-Lake Aldred-06262025-E.png
    8-Conestogas-06262025-E.png
    9- Pequea Creek-06262025-E.png
    10 - Muddy Creek-06262025-E.png
    11 - City Island-06262025-E.png

2025 Resultados:

  • 5-Codorus-05222025-S.png
    4-Yellow Breeches-05222025-S.png
    3-Dauphin County-05222025-S.png
    2-Lancaster County-05222025-S.png
    1-York County-05222025-S.png
    6-Susq & Lake Clarke-05222025-S.png
    7-Lake Aldred-05222025-S.png
    8-Conestogas-05222025-S.png
    10 - Muddy Creek-05222025-S.png
    11 - City Island-05222025-S.png
    9- Pequea Creek-05222025-S.png
    11 - Swatara Creek-05222025-S.png
  • 5-Codorus-05292025-S.png
    4-Yellow Breeches-05292025-S.png
    3-Dauphin County-05292025-S.png
    2-Lancaster County-05292025-S.png
    1-York County-05292025-S.png
    6-Susq & Lake Clarke-05292025-S.png
    7-Lake Aldred-05292025-S.png
    8-Conestogas-05292025-S.png
    9- Pequea Creek-05292025-S.png
    10 - Muddy Creek-05292025-S.png
    11 - City Island-05292025-S.png
    12 - Swatara Creek-05292025-S.png
  • 5-Codorus-06052025-S.png
    4-Yellow Breeches-06052025-S.png
    3-Dauphin County-06052025-S.png
    2-Lancaster County-06052025-S.png
    1-York County-06052025-S.png
    6-Susq & Lake Clarke-06052025-S.png
    7-Lake Aldred-06052025-S.png
    8-Conestogas-06052025-S.png
    9- Pequea Creek-06052025-S.png
    10 - Muddy Creek-06052025-S.png
    10 - City Island-06052025-S.png
    11 - Swatara Creek-06052025-S.png
  • 5-Codorus-06122025-S.png
    4-Yellow Breeches-06122025-S.png
    3-Dauphin County-06122025-S.png
    2-Lancaster County-06122025-S.png
    1-York County-06122025-S.png
    6-Susq & Lake Clarke-06122025-S.png
    7-Lake Aldred-06122025-S.png
    8-Conestogas-06122025-S.png
    9- Pequea Creek-06122025-S.png
    10 - Muddy Creek-06122025-S.png
    11 - City Island-06122025-S.png
    12 - Swatara Creek-06122025-S.png
  • 5-Codorus-06192025-S.png
    4-Yellow Breeches-06192025-S.png
    3-Dauphin County-06192025-S.png
    2-Lancaster County-06192025-S.png
    1-York County-06192025-S.png
    6-Susq & Lake Clarke-06192025-S.png
    7-Lake Aldred-06192025-S.png
    8-Conestogas-06192025-S.png
    9- Pequea Creek-06192025-S.png
    10 - Muddy Creek-06192025-S.png
    11 - City Island-06192025-S.png
    12 - Swatara Creek-06192025-S.png
  • 5-Codorus-06262025-S.png
    4-Yellow Breeches-06262025-S.png
    3-Dauphin County-06262025-S.png
    2-Lancaster County-06262025-S.png
    1-York County-06262025-S.png
    6-Susq & Lake Clarke-06262025-S.png
    7-Lake Aldred-06262025-S.png
    8-Conestogas-06262025-S.png
    9- Pequea Creek-06262025-S.png
    10 - Muddy Creek-06262025-S.png
    11 - City Island-06262025-S.png
    12 - Swatara Creek-06262025-S.png

2025 Resultados:

2024 Results:

Bacteria Monitoring Header.png

Bacteria Monitoring Program

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