View more ongoing sewer maintenance projects.
There are several maintenance programs to ensure that the sanitary sewer system continues to operate effectively and efficiently, and to renew the aging infrastructure.
- Grid Program: All sanitary sewers are flushed with a powerful water jet nozzle at least once every four years.
- Trouble Spots: Trouble spots are identified segments of the system that have proven to be susceptible to accumulation of debris. These locations are visited on a three- or six-month cycle to be flushed.
- Grease Spots: Grease spots are segments of the system that have been identified as being susceptible to an accumulation of grease and oils, which can restrict the capacity of the sewer. They are maintained on a three- or six-month cycle. In addition to flushing the lines, a grease emulsifier is applied.
- Root Control: Some sewer mains are susceptible to invasion of roots from vegetation, which can diminish the structural integrity and inhibit the flow capacity of the pipe. Pipes are routed annually with a mechanical saw, flushed and applied with a herbicidal foam treatment.
- TV Inspection: We own two TV inspection trucks, which include a remote control carriage-mounted video camera that can be inserted into a sewer manhole and dispatched up a sanitary (or storm) sewer. The TV trucks generate a video recording, which can be analyzed at a later date to identify cracks, dislodged pipe joints, locations of house lateral connections, flow conditions and any other sewer characteristics.
- Relining: The sewer main relining program is an annual Capital Improvement Program (CIP) performed by outside contractors and managed by WSS. The CIP funds the relining program to replace approximately 1.5 percent of the sewer system annually, or about seven miles of pipe. Learn more about the relining process.
- Manhole Rehabilitation: There are several different methods of rehabilitating manholes, and the rehabilitation method selected depends on the condition of the manhole. The most common methods are replacing the frame and cover, spraying cementitious mortar to the inside of the manhole, or spraying an epoxy liner to the inside of the manhole. Learn more about the Manhole Rehabilitation Program.
The Storm Sewer Maintenance and Construction Program is responsible for cleaning catch basins and manholes on a scheduled basis, cleaning storm sewer blockages within 24 hours from the report of problems and repairing broken storm sewer lines. The maintenance program provides an efficient storm drainage system that results in fewer flooding problems on streets and private property. This program also provides creek maintenance for control of minor erosion and ensures that open channels retain their flow capacity.