The Bristol Harbormaster's office is open in summer (approximately May 15-Oct 31) 8:30 a.m.-4 p.m. and 6 p.m.-11 p.m., Monday-Friday, and 9 a.m.-5 p.m. Saturdays and Sundays. In winter, the office is open 8:30 a.m-4 p.m., Monday-Friday.
The pumpout boat is available Tuesdays and Thursdays; please call for times.