The City of Redmond has 103 miles of sewer piping that collects municipal and industrial waste and conveys it to the Water Pollution Control Facility (WPCF) for treatment. Wastewater staff are responsible for maintaining wastewater and stormwater conveyance systems. Certified operators periodically inspect, clean and maintain all sewer lines, pump stations, catch basins and dry wells.
Proper maintenance of City infrastructure ensures effective treatment of water and cost savings for operation. The Wastewater Collections staff periodically cleans all public sewer lines in the City of Redmond, removing grease and residue, cutting roots and removing sediment build-up. Proper cleaning and maintenance reduces sewer back-ups and damage to sewer pipes.
In addition to regular cleaning of sewer lines, the City uses a remote TV camera to regularly inspect wastewater lines for problem areas. Use of the TV camera is important to identify areas needing maintenance, removal of grease, roots or sediment, and location of private laterals entering the sewer main. New sewers are TV inspected for compliance to standards and specifications. The Collections staff also completes sewer taps for new developments to connect to public sewer.
The City of Redmond operates 14 pump stations, which pumps collected sewer from subdivisions or developments into gravity discharged sewer mains. These pump stations are continually cleaned and monitored by certified operators.
The Wastewater Collections group is also responsible for cleaning and maintaining the City stormwater conveyance system. Most stormwater in Redmond is collected in catch basins and delivered to a dry well or drill hole for underground injection. Wastewater staff cleans and maintains all catch basins and UIC systems on a regular basis to ensure they are functioning properly.
City staff use sophisticated tools to ensure efficient and effective maintenance of wastewater infrastructure. The City currently owns a Vactor service vehicle which is equipped with water tanks, high pressure spray equipment, vacuum and storage tank. Vactor vehicles are capable of cleaning 4,000 feet of sewer line per day.