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Committee approves SB478 to allow DEF-free engines for in-state use; federal funding concerns raised
Summary
Senate Bill 478 would allow diesel equipment that does not require diesel exhaust fluid (DEF) to operate within Arkansas. The committee approved the bill, and members asked whether the change could affect federal transportation funding; the sponsor said the measure applies only in-state and that the bill had passed the Senate.
Representative Hall introduced Senate Bill 478 to allow diesel equipment certified to operate without diesel exhaust fluid (DEF) to be used inside Arkansas. "This bill only allows for DEF‑free engines to be used inside the state of Arkansas," Representative Hall said, adding that farmers, ranchers and construction groups support the change.
Why it matters: The bill would let operators use diesel equipment that does not require DEF within the state. Proponents said the change could reduce equipment downtime and attract manufacturing, while at least one committee member raised questions about whether the state could jeopardize federal transportation dollars.
Representative Hall said U.S. requirements in 2008 mandated DEF nationwide and that the bill would make an exception limited to Arkansas. He described DEF as a urea‑and‑water mixture used in emissions control. "It's just water and urea, and it mixes with the exhaust fluid," Hall said in explaining the composition; a committee member added that the DEF system components can corrode and fail on equipment.
A member of the committee asked whether the change had been vetted with the U.S. Department of Transportation and whether removing the DEF requirement for in‑state use could jeopardize federal highway funding. Representative Hall responded, "As far as I know," and also noted the bill had passed the Senate; the questioner said that answer was not reassuring.
The committee approved SB478 by voice vote after the sponsor moved for a "do pass" motion; the transcript records the chair calling for "ayes," hearing none opposed and announcing the bill passes. The record does not include a roll‑call tally of individual votes.
The transcript does not contain further technical analysis of federal funding implications or regulatory compliance; the committee passed the bill and stakeholders expressed interest in in‑state relief from DEF requirements for certain diesel equipment.
