Where US State Pilotage Is Required: A State-by-State Orientation

Ask "who has to take a pilot in the United States" and the honest answer is: it depends which water you're in, and which flag the ship flies. Federal law under 46 USC 8501 hands most of the decision to the states, and nearly every coastal state runs its own pilotage system with its own commission, its own districts, and its own rules. This guide orients an operator or a pilots association to how that patchwork works — without pretending to be legal advice for any specific transit.

The federal-state split in one paragraph

For foreign-flag vessels and US vessels under register (engaged in foreign trade), pilotage in state waters is governed by state law — this is the long-standing carve-out in 46 USC 8501. For US vessels in the coastwise trade, federal pilotage rules (46 USC 8502) generally apply, and a federally licensed pilot may serve. The practical upshot: most deep-draft foreign-trade ships in a harbor take a state-licensed pilot, and that pilot's authority and the requirement to use one come from the state, not the Coast Guard.

For the regulatory detail on the federal side, see our note on compulsory pilotage under 46 USC 8501.

Why nearly every coastal state has its own system

State pilotage long predates the federal government — colonial ports licensed pilots before there was a Coast Guard or a USCG license. That history persists: each maritime state typically has a board or commission of pilot commissioners that licenses pilots, defines pilotage districts (often a bar, a harbor, a river, or a sound), sets the tariff, and enforces compulsory-pilotage requirements. The association of pilots in a district holds the commission to serve it.

Because the systems are independent, the specifics vary widely: the size threshold above which a vessel must take a pilot, the draft triggers, the exemptions for vessels with a pilot endorsement aboard, and the tariff formula all differ state to state. What is consistent is the shape: a state commission, defined districts, licensed pilots, a published tariff, and a compulsory requirement for the vessels the state names.

What this means for a pilots association

Three operational consequences follow from the state structure:

1. Your district is a legal boundary, not just a map. The waters you're commissioned to serve are defined by the state. A dispatch system should be configured to that coverage area — which is exactly why a zone-first dispatch model fits a pilots association and a fleet tracker does not.
2. Compulsory-pilotage gaps are worth watching. When a vessel that meets the state's size or trade trigger is transiting your district without an open pilot assignment, that is an anomaly a dispatcher wants surfaced — both as a safety matter and as a commercial one. A board that watches the whole zone can flag a large unpiloted vessel automatically.
3. The tariff is state-shaped. Because the state sets or approves the tariff, billing has to compute from the state's formula — typically gross tonnage and draft. We cover that in how pilotage billing works.

The districts move the most traffic

A handful of districts handle an outsized share of US deep-draft transits — the approaches to the major container and energy ports, the demanding bar crossings, and the long river and sound transits. Several of them sit in waters that are genuinely hard to dispatch: strong tidal currents, exposed bar crossings, or sparse AIS coverage. We look at three of them in detail:

• Cook Inlet pilotage — extreme tides and AIS-dark water.
• Columbia River Bar pilotage — one of the world's most demanding crossings.
• Puget Sound pilotage — a busy, multi-port district.

The bottom line

US pilotage is a federal floor over fifty-some state systems, and in most ports it is state law that decides who takes a pilot. For a pilots association, that means your district, your tariff, and your compulsory requirements are defined by your state commission — and your tooling should be configured to that legal coverage area. Binnacle Passage is built around the district as the first-class unit, which is the same way state pilotage law sees it.

This article is general information, not legal advice. Pilotage requirements are set by federal law and your state's pilotage statutes and commission; consult them and qualified counsel for any specific vessel or transit.