Friends of the Shenandoah River

E. coli Testing Results for September 18, 2025

E. coli Results Tell a Mixed Tale Along the River: From Below Threshold to Concerning Levels

As the summer of 2025 comes to a close, Friends of the Shenandoah River (FOSR) has completed its final E. coli monitoring event for the season.

Of the 14 sites tested on Thursday, September 18, seven exceeded the U.S. Environmental Protection Agency’s (EPA) recommended recreational water quality threshold of 235 colony-forming units (CFUs) per 100 mL of water. Sites with elevated E. coli levels may present a higher risk of waterborne illness during recreational activities.

We are deeply grateful to our dedicated volunteers and generous supporters who made this season’s monitoring efforts possible.

Your commitment is essential to helping us provide timely, meaningful information about water quality to our community.  If you value FOSR’s Summer E. coli Testing Program and would like to help ensure we can continue offering weekly updates next year, please consider making a DONATION to support our work.

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E. Coli Test results for September 19, 2025

These results provide a snapshot of the E. coli bacteria concentrations at the designated sites on the date, time, and under the conditions that the water samples were collected.

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Test Results Archive

These are the E. coli results for the water samples collected on Wednesday June 05, 2024 as part of Friends of the Shenandoah River (FOSR) Summer E. coli Testing Program at public access locations on

These are the E. coli results for the water samples collected on Thursday May 30, 2024 as part of Friends of the Shenandoah River (FOSR) Summer E. coli Testing Program at public access locations on

Friends of the Shenandoah River (FOSR) launched our Summer E. coli Testing Program at public access locations on the Main-stem, South Fork, and North Fork of the Shenandoah River yesterday, Tuesday May 21, 2024. We