July 31, 2026 — The flex at the Environmental Protection Agency (EPA) these days is flexibility, and the agency wants fishermen to know that they have options when it comes to meeting Tier IV requirements. When fishermen decide to build a new boat and need more power than the 803 horsepower limit on EPA Tier III engines, they can apply for a waiver that will allow them to install a higher horsepower Tier III engine.
“It’s on a case-by-case basis,” says EPA Region 1 administrator Mark Sanborn. “We work with the boat builder to see if the engine meets the waiver requirements.”
According to Sanborn, the rule change allowing Tier IV requirement waiver went into effect in 2020. “In June, the folks at Wesmac [Wesmac Custom Boats in Surry, Maine] contacted us about installing an exempt 1000-hp engine in a boat that they were building for a fisherman in Chatham, Massachusetts,” Sanborn explains that the EPA Implementation, Analysis and Compliance Division of the Office of Transportation and Air Quality looked at things like the vessel’s operating profile, the depth of its home harbor, the size of its holding tanks and the areas where the owner would be fishing, and made the determination that he was eligible for a waiver.