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City of Enid details wastewater plant upset, DEQ notice after chemical discharge; city seeks cost recovery from industrial user

Mayor and Board Commissioners Meetings · December 3, 2025
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Summary

City staff reported a May 20 biological upset at the Enid wastewater treatment plant that killed the biological treatment process and led to a fish kill in Skeleton Creek. The Oklahoma DEQ issued a notice of violation and consent order; the city has issued enforcement to industrial user Midcontinent and is seeking recovery of $38,168 in costs.

Enid city staff told the Board of Commissioners that a May 20 upset at the wastewater treatment plant killed the facility—s biological nitrification process and sent partially treated water into Skeleton Creek, causing a fish kill.

"On May 20, we had a major, biological upset in the wastewater treatment plant resulting in the discharge of partially treated wastewater, which led to a fish kill in, Skeleton Creek," Brooke, a city staff presenter, said. Routine sampling detected elevated ammonia and surfactants and low dissolved oxygen levels that harmed aquatic life.

The Oklahoma Department of Environmental Quality issued a notice of violation on June 18 and subsequently a consent order. The consent order requires corrective actions, enhanced monitoring and…

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