Complaint Timeline and Resident Reports Residents of Marion have repeatedly reported a strong chlorine odor, unpleasant taste, and water discoloration since mid‑December 2025, according to 10TV and local complaints logged in early 2026 [1]. The complaints resurfaced in February 2026, prompting renewed community outcry and media coverage [1]. Aqua Ohio acknowledges the reports but maintains that the water remains safe for consumption [1].

Utility’s Explanation and Immediate Mitigation Measures Aqua Ohio identified geosmin, a naturally occurring compound that causes earthy odors, as the source of the taste and smell issues and confirmed it poses no health risk [1]. The utility advised customers that boiling water is unnecessary and began flushing fire hydrants in the affected neighborhoods to disperse the compound [1]. Treatment adjustments were also implemented to reduce geosmin levels in the distribution system [1].

Ohio EPA’s Assessment and Expanded Sampling Plan The Ohio Environmental Protection Agency stated that current testing shows the water meets all state and federal standards, with no detectable contamination in groundwater or surface sources [1]. Nevertheless, the agency announced it will collect additional samples to verify compliance and monitor geosmin concentrations more closely [1]. EPA officials emphasized transparency and ongoing communication with both the utility and the public [1].

Prosecutor Grogan’s Call for a Full Investigation Marion County Prosecutor Ray Grogan declared the utility’s assurances insufficient and formally requested that the Ohio EPA launch a comprehensive investigation into the water quality complaints [1]. Grogan warned that continued inaction could erode public trust and demanded corrective actions beyond routine sampling [1]. The prosecutor’s request marks the latest escalation in the dispute between residents, the utility, and state regulators [1].