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July 11, 2025
Enjoy your river - the results for this week's testing of the Willamette River are good.
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Note on Algae: While Environmental Services tests for bacteria, the Oregon Department of Environmental Quality monitors another potential hazard: algae blooms. These can form in slow-moving parts of rivers and lakes during warm weather.
If you see water that looks green or has a coating on the surface, stay out.
To check for current health advisories, visit the Oregon Health Authority’s Harmful Algae Bloom webpage.
The lower the E. coli count, the better. All E. coli counts that are less than 406 are good and meet the standards set by the Oregon Department of Environmental Quality for safe swimming and other river recreation.
Sample collection date: July 9, 2025
↓ = Count is below 406 (good)
↑ = Count is above 406
A value of 'ND' indicates a non-detection.
Environmental Services samples for E. coli bacteria and water temperature at five popular Willamette River locations each week from late May to September. Samples are taken on Wednesdays, and results are posted by Friday—just in time for the weekend.
If you have any questions regarding these results, please contact bespio@portlandoregon.gov
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How Did the River Become Clean Enough to Swim and Play?
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Know someone who would be interested in water quality updates?
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The City of Portland is committed to providing meaningful access. To request translation,
interpretation, modifications, accommodations, or other auxiliary aids or services,
contact 503-823-7740, Relay: 711.
Traducción e Interpretación | Biên Dịch và Thông Dịch | अनुवादन तथा व्याख्या
口笔译服务 | Устный и письменный перевод | Turjumaad iyo Fasiraad
Письмовий і усний переклад | Traducere și interpretariat | Chiaku me Awewen Kapas
Translation and Interpretation: 503-823-7740
City of Portland Bureau of Environmental Services | 1120 SW Fifth Ave. | Suite 613 | Portland, OR 97204
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