The Ohio Manufacturers’ Association (OMA) is urging the Ohio Environmental Protection Agency (EPA) to preserve a scientifically sound, evidence-based approach as the agency updates rules used to determine whether nutrients are impairing Ohio waterways.

In comments filed this week, OMA supported the agency’s proposed “weight of evidence” framework, which relies on methodical analysis and reliable data before attributing water-quality problems to nutrients. OMA warned that an incorrect finding could impose enormous costs on manufacturers, municipalities and their customers.

OMA also called for clear public notice and meaningful administrative review before Ohio EPA begins a nutrient assessment or finalizes its findings. Manufacturers and other permit holders should have an opportunity to review the evidence and challenge decisions that could result in significant new compliance costs.

“A nutrient finding can trigger enormous costs for manufacturers and communities, so the evidence has to be credible and the process has to be transparent,” said James Lee, managing director of public policy services for the OMA. “Ohio EPA should get the science right before those costs are imposed.” 7/29/2026