Hummock Pond is a eutrophic coastal pond located on the southwest side of Nantucket Island. Hummock is approximately 2.3 miles long, running north to south with an average depth of 6 feet. The watershed to pond ratio, at an average is 15:1. The pond is approximately 142 acres in size with a surface drainage basin of approximately 2,227 acres and a groundwater drainage basin of approximately 2,000 acres. Hummock Pond is opened twice a year to enhance marine fisheries.

Sesachacha Pond is a coastal eutrophic salt pond located on the northeast portion of Nantucket Island. It is a kettle pond with two deep basins of 15-18 feet on the northern and southern end. The surface area of the pond is approximately 266 acres with a drainage basin of 800 acres. Sesachacha Pond is opened twice a year to enhance marine fisheries.

Madaket Harbor and Long Pond make up a unique ecosystem encompassing approximately 9 square miles. These two systems are hydrologically connected via Hither Creek and the Madaket Ditch. Long Pond is somewhat isolated from the whole system, and may be evaluated as having separate water quality issues. It is relatively narrow and winding with depths of 4-6 feet with no deep basins.

Miacomet Pond is located on the south side of the island of Nantucket. Miacomet Pond has a surface area of 46 acres. There is a maximum depth of 11 feet near its southern end and the mean depth of the pond is 4.8 feet. The pond has a large surface water drainage area of approximately 1,284 acres based on the topography of the surrounding landscape. The probable area of groundwater drainage to Miacomet Pond is 1,047 acres.