Ohio Lime Company Gets New Rules for Stinky Kiln
Published Date: 12/11/2025
Rule
Summary
The EPA is giving a thumbs-up to new sulfur dioxide (SO2) pollution limits for Carmeuse Lime’s plant in Ohio, helping keep the air cleaner in Seneca County. These updated rules kick in on January 12, 2026, making sure the plant controls its emissions better. This means healthier air for the community without extra costs for taxpayers.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 1 costs, 0 mixed.
New SO2 Limit for Local Air
EPA approved a new sulfur dioxide (SO2) emissions limit for the Carmeuse Lime Maple Grove facility in Seneca County, Ohio: a 30-day rolling average cap of 1,170 pounds per hour for the combined lime kiln stack. This approval is effective January 12, 2026, and EPA says the new limit will reduce emissions and help the area show compliance with the 2010 SO2 National Ambient Air Quality Standard.
No Significant Small-Business Impact
EPA certified that this action does not have a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act. The final rule approves State-issued limits and does not impose requirements beyond State law, effective January 12, 2026.
State Limit Now Federally Enforceable
EPA incorporated by reference Ohio's Director's Findings and Orders (DFFOs) for Carmeuse Lime into the federally enforceable State Implementation Plan, making the 1,170 lbs/hr SO2 limit federally enforceable under Clean Air Act sections 110 and 113 as of January 12, 2026. That means federal authorities can enforce the same emissions limit against the facility beginning on that date.
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