Environmental Enforcement Board Special Meeting - June 29, 2026

The Environmental Enforcement Board of the City of Enid held a special meeting on June 29, 2026, to address a notice of violation and administrative order related to a wastewater treatment plant upset caused by elevated levels of quaternary ammonium compounds (QACs) discharged by Midcontinent. The meeting involved detailed testimony from city officials, environmental experts, and consultants regarding the incident that occurred in May 2025, which resulted in a fish kill and regulatory penalties. The city presented evidence of costs incurred for environmental testing, penalties, and remediation efforts, including the purchase of neutralizing chemicals and equipment. Expert witnesses provided scientific analysis on the toxicity levels of QACs necessary to kill the beneficial bacteria in the wastewater treatment process, with discussions focusing on chemical fingerprinting of samples from Midcontinent's discharge point and the plant influent. The board reviewed extensive scientific literature and debated whether the QAC levels from Midcontinent were sufficient to cause the biological upset. The city argued that Midcontinent's discharge violated its permit and the city's sewer use ordinance, causing interference with the treatment process and environmental harm. Midcontinent contested the findings, citing discrepancies in chemical fingerprinting and the absence of QACs at toxic levels at the plant influent. The board considered procedural issues, evidence admission, and the cooperation of Midcontinent throughout the investigation. The meeting concluded with the board tasked to determine whether the city's enforcement action was supported by the evidence and to decide on penalties and cost recovery related to the incident.