Water

NPU Customers receive water from two sources – the Deep River Reservoir, located in Colchester and the Stony Brook Reservoir, located in Montville. We also have a groundwater well and interconnections with other water suppliers, which serve as reserve supplies in case of an emergency. Combined, our treatment facilities provide roughly 1.9 billion gallons of clean drinking water every year, or approximately 5.3 million gallons a day.

Our distribution system is carefully maintained and tested, to ensure the water coming out of your faucet is of the same high quality as when it leaves the plant. This includes the regular flushing of our system to remove sediment and keep the water clear.

Water Treatment Process

Water from our reservoirs is treated at two water treatment plants, the Dr. Charles W. Solomon Water Treatment Plant in Lebanon and the Stony Brook Water Treatment Plant in Montville. NPU’s treatment process consists of a series of steps. First, raw water is drawn from our water source and goes to a mixing tank where elements are added. The addition of these substances allows for filtration. 

The water is then filtered through layers of sand, where smaller suspended particles are removed and clear water emerges. Additional elements are added for disinfection before the water is pumped to underground reservoirs and water storage facilities and into your home or business.

For more information on your water, please read the Water Quality Report published annually.  

For more information on the Drinking Water State Revolving Fund program (DWSRF), please visit the DPH’s DWSRF website.

Water Service Lines

NPU water customers should be familiar with their water service lines. NPU provides water from the water main pipe to the curb stop which provides water to the customer owned service line. The customer service line starts at the curb stop and extends to the customers property. 

It is the customers responsibility to maintain the customer owned service line. Click here to view the Water Service Line Drawing

Source Water Protection

The State of Connecticut Department of Public Health (DPH) in cooperation with the Department of Environmental Protection (DEP) recently completed an initial assessment of the Deep River Reservoir, which is a source of public drinking water that is maintained and operated by the Norwich Water Department. This one-time assessment is part of a nationwide effort mandated by Congress under the Safe Drinking Water Act Amendments of 1996 to evaluate the susceptibility of all public drinking water sources in Connecticut to potential sources of contamination. DPH began working in partnership with the DEP in 1997 to develop Connecticut’s Source Water Assessment Program, which was approved by the U.S. Environmental Protection Agency in 1999. Sources of potential contamination that are of concern to public drinking water supplies here in Connecticut are generally associated with historic waste disposal or commercial, industrial, agricultural and residential properties that store or use hazardous materials like petroleum products, solvents or agricultural chemicals. Click here to view the Source Water Assessment Report.