E. coli has been detected for the fourth time at the Tenino Wastewater Treatment Plant, a problem that could be costly to repair, officials said last week.
Public Works Director Dave Defoe said the E. coli is affecting a water well that serves the lab building at the plant. The building is used to test samples of water.
Although distilled water is used for the samples, the E. coli-infected water is used for flushing toilets, washing hands and while the dishwasher is in use.
“The Thurston County Department of Health is possibly going to require us to redo some treatment systems out there,” he told the council.
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To fix the problem, the city may have to build a new reservoir or put in additional piping, Defoe said, adding that engineers will have to be involved in the process.
“It could end up being a lot of money for what it’s used for,” he said.