Sanitary Sewer Jetting and Cleaning Process in Zone 2

The Owatonna Wastewater Treatment Facility has embarked on its annual sanitary sewer jetting and cleaning for 2024, targeting Zone 2. This initiative, part of the city’s ongoing effort to maintain and improve its sewer infrastructure, involves a meticulous and systematic process designed to ensure the proper functioning of the sewer mains.

How It's Done

Jetting involves the use of a specialized vehicle known as a Jetter Truck, which is equipped with a 1,200-gallon water tank and a hose extending up to 600 feet. The operation begins by feeding the hose through manholes into the main sewer lines. Once in position, the pump on the truck propels water through the hose, which is capped with a high-pressure jetting nozzle. The nozzle releases water at pressures ranging from 1,200 to 1,800 pounds per square inch (psi).

By advancing the nozzle upstream to the next manhole, typically 300 to 350 feet away, and then retracting it slowly, the system effectively dislodges and clears accumulated debris like wipes, sand, grit, grease, and other solids. These loosened materials are subsequently dealt with by either flushing them downstream or vacuuming them into the truck’s debris box.

Annual Cleaning Schedule

To manage the extensive sewer network, the city has devised a systematic approach, cleaning 20% of the sewer mains each year over five designated zones. This cycle ensures that all main lines are thoroughly cleaned at least once every five years. For 2024, the focus is on Zone 2, aligning with this rotational schedule.

Advisory for Residents

Residents within Zone 2 may notice gurgling sounds and occasional odors as jetting operations proceed in their area. It is advised to fill drain traps with water after the cleaning is completed in the vicinity. The vacuum effect generated by the jetting process can sometimes empty these traps, potentially leading to the release of unpleasant odors.

For any questions or if issues are encountered, community members are encouraged to contact the Owatonna Wastewater Treatment Facility directly at 507.444.2452. Additional information is also available on the city’s official website, Sanitary Sewer Cleaning | Owatonna, MN.

By maintaining a regular and thorough cleaning schedule, Owatonna ensures its sewer system remains efficient and less prone to blockages and other issues, reinforcing the city's commitment to public health and environmental quality.