eFoil regulations & spots in United States

At the federal level, the U.S. Coast Guard treats motorized personal hydrofoils (eFoils) and motorized surfboards (jetboards) as vessels under 1 USC 3. USCG Policy Letter 01-22, effective October 5, 2022, requires operators to carry a state-issued Certificate of Number (vessel registration), comply with PFD rules under state and federal law, carry a sound-producing device, meet 33 CFR 83 Inland Navigation Rules lighting requirements (including for operation between sunset and sunrise or in reduced visibility), and either fit an engine cut-off switch (ECOS) per 46 USC 4312 or rely on a manufacturer exemption. A fire extinguisher is required unless every operator is wearing a USCG-approved PFD.

Because eFoils are vessels propelled by machinery, registration is handled by each state's titling agency. Florida requires registration of all motor-powered vessels with FWC/HSMV; operators born after January 1, 1988 must complete an approved boating safety course before operating any vessel of 10 hp or more. California requires every motorized vessel — explicitly including motor-equipped surfboards and similar craft — to be registered through the DMV, and operators 16+ generally need a California Boater Card. Hawai'i registers vessels through DOBOR and applies the federal eFoil policy verbatim; some county harbors and ocean recreation management areas add local restrictions.

Waterway access is the most variable element. National Park Service waters frequently prohibit personal watercraft and motorized surface craft except where specifically authorized; many state and municipal beaches, harbors, swim areas, and marine protected areas exclude motorized vessels entirely or impose idle-speed buffers (commonly 100 feet or 300 feet from swimmers, divers-down flags, or shorelines). Manatee protection zones in Florida, marine reserves in California, and humpback whale sanctuary waters around Hawai'i impose seasonal or permanent speed and exclusion rules that apply to eFoils as motor vessels.

Enforcement is real but uneven. State marine patrols (FWC, CDFW/State Parks, DOCARE in Hawai'i) and the USCG can cite eFoil operators for missing registration, no PFD, no kill-switch lanyard, riding after dark without lights, or operating in closed zones. Recreational riders most often encounter enforcement at busy harbors and beaches; the practical baseline anywhere in the U.S. is: register with the state, wear a Coast Guard-approved PFD, use the kill-switch leash, stay clear of swim areas and protected zones, and check local rules before launching.