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City reviews response after industrial sanitizer compounds trigger fish kill, reseeding at wastewater plant
Summary
The City and its contractor, the Stover Group, briefed commissioners on a mid‑May wastewater treatment upset that officials say was caused by strong sanitizer compounds entering the sewer system and led to elevated effluent ammonia and a reported fish kill in Skeleton Creek.
The City discussed a wastewater‑treatment upset that led to elevated ammonia in the plant effluent and a reported fish kill in Skeleton Creek after strong sanitizer compounds entered the sewer system.
At a study session, Dr. Ross Stover, vice president of the Stover Group, said operators first saw soapy foam on the influent May 20 and then rising effluent ammonia concentrations. "We're getting there," Stover said, describing steps taken to stop the discharge and restore biological treatment.
Stover told the commission lab analyses showed very high concentrations of cationic surfactants — mainly quaternary amines — at levels he said can inhibit treatment at 3–5 milligrams per liter. "We saw it anywhere from approximately 5 and a half to almost 13 milligrams per…
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