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Cordell Native Scott Mason outlines new proposal to eliminate DEF Deratements

The Environmental Protection Agency (EPA) has introduced a proposed rule to eliminate all diesel exhaust fluid (DEF) deratements, offering significant regulatory relief to agricultural producers and the trucking industry. Farm Director KC Sheperd recently spoke with EPA Region 6 Administrator and fifth-generation Oklahoman Scott Mason to discuss the agency’s efforts to address ongoing concerns regarding DEF, emissions regulations, and water poli…
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cordellbeacon.com broke the news in New Cordell, United States on Wednesday, July 29, 2026.
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