EPA Enforcement Cases by Category.
EPA Clean Air Act enforcement cases involve different categories of defendants under different regulatory provisions. Browse by category to focus on the case types most relevant to your operation, with each category page providing the controlling statutory framework and complete case list.
Manufacturer
Original equipment manufacturers and importers of engines, vehicles, and aftermarket components — typically involving uncertified engines or falsified Certificate of Conformity applications.
View manufacturer casesAftermarket
Retailers, distributors, and installers of aftermarket parts that defeat or tamper with vehicle emissions controls — defeat devices, EGR/DPF/DEF deletes, catless exhausts, and tunes.
View aftermarket casesOther
Cases resolved under the Clean Air Act's vehicle and engine enforcement provisions that do not fit the standard category classifications.
View other casesOff-road
Non-road engine and equipment cases — generators, construction equipment, and recreational vehicles regulated under 40 C.F.R. Parts 1033–1068.
View off-road casesFleet operator
Businesses that own or operate motor vehicles and have allegedly tampered with emissions controls on vehicles in their commercial fleet.
View fleet operator cases