History

The City of Raleigh’s E.M. Johnson Water Treatment Plant was originally constructed in 1965 with a capacity of 25 million gallons per day. The plant has undergone several upgrades and currently has a permitted capacity of 86 million gallons per day. The E.M. Johnson Water Treatment Plant receives water from Falls Lake Reservoir, which inbounds water from the Neuse River. Raw water is conveyed to the plant site and stored in two 70 million-gallon terminal reservoirs. Raw water flows by gravity from the terminal reservoirs through rapid mixing, flocculation, and sedimentation processes prior to ozonation, filtration, and disinfection. The proposed upgrades to rapid mixing, flocculation, and sedimentation will expand treatment capacity of these three processes and pave the way for a future plant treatment capacity of 120 million gallons per day.