Water Facilities

Russell F. Tennant Water Treatment Facility


The City of Attleboro Russell F. Tennant Water Treatment Facility came online in June of 1995 to service the City in meeting the increasingly stringent regulations of the Massachusetts State Department of Environmental Protection and the Environmental Protection Agency.

Water from Orr's Pond or Manchester Reservoir is screened and pumped to a pre-treatment basin where it is mixed with a coagulant, polyaluminum chloride (PACl). The water then flows into a series of flocculation basins where fine particles (floc) form from the reaction of the PACl with suspended materials in the water. In the flocculation basins, the particles begin to increase in size as smaller particles of floc gather together and form larger particles.


From the flocculation basins, the water flows into several sedimentation basins where, over time, the floc particles settle to the bottom and are removed as sludge. The next step in the process is a mixed-media filtration system of activated carbon and sand. This process removes any remaining particles in the water, as well as treating for taste and odor.

Several water treatment chemicals are then added to the filtered water for conditioning and disinfection. To ensure proper disinfection, the water passes slowly through a 1.6 million gallon chlorine contact tank. This tank allows the proper reaction time between the treated water and the chlorine disinfectant. From there the water flows into a storage clear well before being pumped into the distribution system for consumer use.

In order to treat seasonal fluctuations of manganese, organics, and other compounds in the reservoir water, the water entering the plant is at times treated with ozone before it is treated with PACl.

Average production of the Russell F. Tennant Treatment Facility ranges from 3 million to 8 million gallons per day, depending on the season.

Wading River Treatment Plant


The Wading River Treatment Plant has been in service since the 1920’s. The last treatment upgrade to the plant was completed in 1994. 

Water from Blake’s Pond is diverted into two outdoor beds, where particles are removed through slow sand filtration. The filtered water is then pumped to a 660,000 gallon chlorine contact tank, similar to the tank at the Russell F. Tennant Treatment Facility, but on a smaller scale. The pH of the water is adjusted after the contact tank, and the water is pumped into the distribution system for consumer use.

Average production of the Wading River Treatment Plant ranges from just under 1 million to 2 million gallons per day, depending on the production needs of the Department

2018 Sanitary Survey Report (PDF)