Lake Washington, Melbourne's Drinking-Water Lake — Melbourne, Florida

Lake Washington is a natural lake in the St. Johns River marsh west of Melbourne, and the reason a coastal Brevard County city drinks river water. The City of Melbourne's water treatment page calls it the third uppermost of the naturally connected upper St. Johns River lakes and one of the few surface water supplies of drinking water in Florida. Water pumped from the lake is treated at the John A. Buckley Surface Water Treatment Plant.

The lake sits inside public conservation land. The St. Johns River Water Management District's River Lakes Conservation Area takes in lakes Washington, Winder and Poinsett, a chain of open water and sawgrass that the river threads on its way north. Wetlands there are dominated by sawgrass, smartweed, arrowhead and maidencane, and the District lists wood storks, bald eagles, Florida sandhill cranes and river otters among the listed species using the area west of Melbourne.

Because most of the city's tap water starts there. FOX 35 Orlando reported on Aug. 6, 2026 that about 75 percent of Melbourne's drinking water comes from Lake Washington. The rest comes from the Joe Mullins Reverse Osmosis plant, which the city says draws from four Floridan Aquifer wells about 650 to 850 feet underground, each yielding roughly 3.1 million gallons per day.

The lake's reach extends well past the city limits. Melbourne's utility supplies drinking water to Melbourne Beach, Indialantic, Indian Harbour Beach, Satellite Beach, Palm Shores, Melbourne Village and unincorporated Brevard County south of the Pineda Causeway, and sells water wholesale to West Melbourne. A change in the lake therefore shows up in kitchens from the mainland to the barrier island.

Brevard depends on the river more broadly. In an August 2022 report, Florida Today described the St. Johns as the river that feeds half of Brevard's water supply, with Melbourne drawing from Lake Washington and Cocoa from Taylor Creek, both outflows of the St. Johns.

A single structure does most of the work. According to SJRWMD, St. Johns River flow in the River Lakes area is regulated at only one point, a fixed-crest weir just north of Lake Washington, which holds water back in the lake to help ensure Melbourne's supply.

Upstream marsh restoration adds a reserve. The Florida Specifier reports that during drier times, water stored within the restored wetlands of the upper basin has been released to augment Lake Washington, the City of Melbourne's water supply. The Specifier adds that the same restored marshes stored floodwater during Hurricanes Matthew in 2016 and Irma in 2017.

Drought still tests the system. Florida Today reported on Aug. 13, 2022 that the St. Johns was three feet below normal, with Lake Poinsett so low that a wide sandy beach had opened near the State Road 520 bridge, and warned that algae blooms in Lake Washington could complicate treatment of Melbourne's drinking water. The U.S. Geological Survey has tracked the river here since 1939 at its St. Johns River near Melbourne gage, which drains 968 square miles of the upper St. Johns and is operated in cooperation with the District. Its record of peak measurements runs from September 1940 to October 2024.

Blooms have shaped Melbourne water policy twice in recent years. In summer 2019, Florida Today reported through WKMG that Lake Washington had been posted with signs about a potentially toxic algae, and on Aug. 2, 2019 the city announced that its latest tests of the lake and of finished drinking water found no algae toxins. The city's public works director noted that the Buckley plant's raw water intake is strategically located to provide optimal raw water quality. The same report cited SJRWMD research pointing to the spreading of biosolids on rural lands as a source of rising phosphorus in Lake Washington and other east Central Florida lakes.

The 2019 report also recorded how Melbourne officials explained the episode: warmer than usual temperatures earlier that year, and ongoing repairs to the part of the treatment process that typically handles such raw water problems at the Buckley plant. More than 200 city water customers attended a town hall on the issue led by state Rep. Randy Fine. The paper noted that heavy summer rains can dilute algae in Lake Washington in the short term while carrying more nitrogen and phosphorus runoff into the lake, which can feed later blooms.

The second episode came in summer 2026, when Melbourne residents complained that tap water looked, smelled and tasted unusual during a Lake Washington bloom. FOX 35 reported that the City Council voted to pursue a Florida Department of Environmental Protection grant of more than $20 million, about a quarter of an estimated $80 million upgrade, and that District 3 Council Member David Neuman described the goal as better water quality.

The upgrade is designed to lean less on the lake. The city has already completed a deep injection well to dispose of wastewater from treatment, and the next phase adds several groundwater production wells feeding treated brackish water into the Melbourne system. Officials expect supply to be split more evenly between Lake Washington and groundwater once the work is done, and said the project will proceed whether or not the state grant is awarded.

Yes, mainly by water. SJRWMD lists boat ramps on State Road 520, U.S. 192 and at Lake Washington County Park, which has picnic pavilions, restrooms, a fishing pier and ramps for boats, canoes and airboats. Primitive campsites along the river are reachable by boat, and more than 7 miles of trails cross the conservation area west of Melbourne.

A land entrance sits at the western end of Wickham Road. The District opens that gate at 7 a.m. and closes it promptly at 7 p.m., and the designated parking area lies about 3 miles, or 15 minutes of driving, west of the gate. Most of the property falls within the Upper St. Johns River Marsh Wildlife Management Area, where hunting is allowed in season alongside fishing, hiking, bicycling, canoeing and wildlife viewing, and cattle may be present on parts of the River Lakes land near Lake Washington.