The City of The Dalles Wastewater Treatment Plant has discharged effluent that exceeds the plant’s limit for E. coli due to incomplete disinfection, according to a press release from the city. Sample test results read on the morning of July 12 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 an upset in biological processes. Rigorous water quality monitoring is ongoing.

Chenowith Water PUD water is contaminated with E. coli bacteria, and customers are advised to boil all water before using, according to a notice from the PUD.