What is a PADD region, and why crude stocks get reported by district

If you've spent any time in the weekly EIA release, you've seen the acronym before the number ever shows up: PADD 2 builds, PADD 3 draws, Cushing ticks up. PADD stands for Petroleum Administration for Defense District, a geographic split the U.S. government drew up during World War II to manage fuel distribution. It never got retired. Five decades later it's still the backbone of how crude and product stocks get reported, because pipeline and refining infrastructure never stopped running along those same lines.

Five districts make up the full map. PADD 1 covers the East Coast, split further into 1A, 1B, and 1C for New England, Central Atlantic, and the Lower Atlantic. The Midwest sits in PADD 2, the district everyone watches for Cushing. Refining capacity concentrates hardest in PADD 3, the Gulf Coast. Districts 4 and 5 round things out, the Rocky Mountain states and the West Coast, including Alaska and Hawaii.

Why a national total hides the story

A single national crude stocks number tells you almost nothing about where barrels sit or why they're moving. Crude doesn't flow freely between districts the way a spreadsheet implies. Pipeline capacity between the Gulf Coast and the East Coast, for instance, is nowhere near enough to arb away a regional imbalance quickly. So when the Gulf Coast builds while the Midwest draws, that's not noise canceling out to a flat national print. It's two separate stories that happen to land in the same weekly table.

This is why desks watch PADD 3 Gulf Coast crude stocks almost as a separate instrument from the headline number. The district holds the bulk of U.S. refining capacity and most of the export terminals, so its inventory swings tell you about run rates, turnaround season, and how much is queued up to load for export. A build here during a known maintenance window reads completely differently than the same build happening when every complex is supposed to be running flat out.

PADD 2 Midwest inventory carries its own logic, mostly because of Cushing. Cushing sits inside that district and functions as the delivery point for WTI futures, so Midwest stock levels feed directly into the number everyone's pricing against. A draw at Cushing specifically can move the front of the curve even if the broader region barely budges, because the market cares about deliverable supply at that one hub more than the regional aggregate.

How the district split changes what you're watching

Once you're reading by district instead of by national total, the questions change. Is a Gulf Coast build a refinery outage or a slowdown in export loadings? Is a Midwest draw a Cushing story or a broader regional pull tied to Canadian imports running light? None of that is visible in the top-line crude stocks print. It only shows up once you break the table apart by region, and even then you're working from a number that's already a week old by the time Wednesday's release hits your screen.

That lag is the part that bites hardest around Gulf Coast refinery turnarounds or a cold snap moving through the Midwest. The agency figure confirms what happened last week. It doesn't tell you what's sitting in tank farms along the Houston Ship Channel or around Cushing right now. A daily satellite-based read on floating-roof tank levels closes some of that gap, giving you a regional signal you don't have to wait a week to see confirmed.

The district lines aren't going anywhere, so getting comfortable reading crude stocks by region rather than by national headline pays off fast. Checking those same regional tanks between the Wednesday prints, not just on them, is the next habit worth building. That's the gap Oil Inventory Index is built to fill, one daily satellite pass at a time.