Vol. I · Investigation No. 001
THE DIESEL MANDATE
The government paused the prosecutions. It did not repeal the mandate.
An investigative record of the regulations, prosecutions, costs, mechanical failures and national-security consequences of America's diesel-emissions system.
Closed — EPA public hearing (July 29–30, 2026)
Docket EPA-HQ-OAR-2026-0728 — hearing and written-comment window closed.
EPA public hearing · July 29–30, 2026
Testify on EPA's proposed heavy-duty diesel inducement changes
Docket EPA-HQ-OAR-2026-0728. EPA requests intended speakers and those requesting accommodations to complete registration by July 22, 2026. Registration remains open through the final day of the hearing.
This site is not an official EPA portal. It does not submit comments on your behalf. All submissions go directly to EPA.
Closed — hearing and comment window ended
Status current as of 2026-07-10
Last verified 2026-07-10
Source: EPA public hearing page
Current status
- Criminal enforcement
- Paused by current DOJ policy
- Civil tampering law
- Still in force
- Consent decrees
- Still binding
- Diesel-emissions mandate
- Still in force
A ceasefire is not peace. Prosecutorial discretion can change with one memorandum. The statute, hardware, penalties and failure modes remain.
Featured investigation
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The system at a glance
Six lines of inquiry
- The mandate →Statutes, EPA rulemakings and consent decrees that define the current federal diesel-emissions system.
- The prosecutions →Criminal cases, civil settlements, raids, consent decrees and pardons documented on the public record.
- The mechanical cost →DPF, EGR, SCR and DEF hardware, repair intervals, downtime and consumer-cost analysis.
- The human cost →Defendants, shop owners, mechanics, farmers and fleet operators inside the enforcement record.
- The freight-readiness threat →Aftertreatment reliability, derates, emergency response and Department of Defense surface movements.
- What Washington can do →Legislation, oversight, rulemaking petitions and formal EPA comments.
Human consequences
People on the record
The people below appear in public federal filings, clemency actions or the public policy debate. Status is drawn from the record. No allegation is presented as a proven fact.
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National security
The military exempts the tactical vehicle. The civilian tractor hauling it is not exempt.
This section will examine commercial freight capacity, Department of Defense surface movements, emergency equipment, aftertreatment reliability and the operational consequences of engine derates on civilian-registered heavy diesel equipment used for military and emergency logistics.
Congressional action
Contact your delegation
Select your state to preview your senators and House members. Photographs are intentionally omitted; this is a contact record, not a campaign flyer.
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Research library
The record, organized
- Statutes and regulations
- EPA rulemakings
- Criminal cases
- Civil settlements and consent decrees
- Pardons and clemency
- Regulatory impact analyses
- Small-business comments
- Mechanical and fleet data
- Emergency-response materials
- Defense freight and surface transportation
Stay on the record
Get major updates when the mandate materially changes.
Receive major updates when federal rules, hearings, court cases or congressional actions materially change the diesel mandate.