The Edgartown Light at the end of Water Street marks the entrance to Edgartown Harbor. Entered through a modest channel on the north side of town, Edgartown Harbor opens to Katama Bay on the south side of the island. Katama Bay is formed by a barrier beach that occasionally connects the part of town on Chappaquiddick Island to the rest of Edgartown Harbor.
The resulting protected Katama Harbor offers abundant mooring for large and small vessels. This part of Edgartown Harbor's marine facilities can support motorized boats and large sailing vessels, but it cannot accommodate yachts and large ships that must anchor outside the harbor.
Edgartown Harbor is a zero discharge zone where boats must use their holding tanks at all times. Anchorage is in the outer Edgartown Harbor to the port side of the red nun buoy #8. The Edgartown Harbormaster has authority to open Katama Bay under some weather conditions, in which case yachts can anchor south of green can #13. Under certain wind conditions, yachts may be asked to leave Katama Bay and anchor in the outer Edgartown Harbor.
Dockage is available in Edgartown Harbor for vessels of a minimum 15.2 meters (50 feet) length for $4 per foot (including swim platforms, pulpits, and bowsprits). Moorings are available for $40 per night. No overnight mooring is allowed in Katama Bay.
The licensed launch provider for Edgartown Harbor is Oldport Marine from Newport, Rhode Island. They provide services for the upper third of Katama Bay, all moorings in the inner harbor, and anchorages in the outer Edgartown Harbor. Launch captains can provide information on operating hours and seasonal rates.
Rafting is allowed at the discretion of the Edgartown Harbormaster at a cost of $20 per night. A second boat can raft to a mooring if it is the same size or smaller than the boat having the reservation. The Harbormaster will determine if a third boat can be allowed.
The Edgartown Harbormaster offers free pump-out services from 8am until 3pm seven days per week. The pump-out vessel comes to the moorings and anchorages, and boaters can get information on the daily service through VHF radio channel 74. Long-term users can secure automatic scheduled services. Whenever possible, there is emergency holding tank service available in Edgartown Harbor.
Edgartown Harbor's fuel dock is on the North Wharf and operates from 8am until 5pm. Propane is provided by Vineyard Propane at the Dukes County Airport in Edgartown Harbor. Island Fuel Inc. provides marine diesel fuel delivery services. Water can be secured at the North Wharf in Edgartown Harbor while boaters are fueling. There is also a Water Barge opposite green can #9. Ice is available at several provisions shops nearby. There are also restrooms, showers, and a laundromat in Edgartown Harbor. Boat and sail repairs as well as chandlery shops are also available conveniently in Edgartown Harbor.