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JOSIAH CHASE WATER
FILTRATION PLANT: 

DRINKING WATER TREATMENT

The Josiah Chase Water Filtration Plant (JCWFP) started producing drinking water in mid 1990.  It was designed to produce a maximum of 4 million gallons (at 2,800 gallons per minute) of treated water per day that meets or exceeds US EPA Primary and Secondary drinking water standards.  The standards are health based (known as Primary) and aesthetic quality (Secondary- appearance & taste).  There are also other requirements and guidelines for the treatment methods employed, meant to ensure optimum treatment performance and comply with other requirements under other EPA programs like the Surface Water Treatment Rule, Disinfection Byproduct Rule, and Lead and Copper Rule etc.

The treatment process at the JCWFP plant is known as Direct Filtration.  This treatment process, consisting of multiple treatment techniques strung together was chosen specifically based on treating Chase’s Pond water quality.  The various treatment unit processes consist of; Aeration/Circulation, Straining, Pretreatment when needed, Coagulation & Flocculation, Clarification, Filtration, Primary Disinfection, Corrosion Control, Secondary Disinfection, and then finally it is sent out to our customers (Distribution).