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Wastewater Treatment Plant Discharge Exceeds E. coli Limit

The City of The Dalles Wastewater Treatment Plant has discharged effluent that exceeds the plant’s limit for E. coli due to incomplete disinfection. Sample test results read on the morning of October 28, 2025, indicated an E. coli exceedance. Several resamples in the following 24-hour period confirmed that the treatment process is not under control. The cause of the exceedance is unknown at this time.

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