Wastewater Treatment Plant


The Anacortes Wastewater Treatment Plant, located on T Ave between 4th & 6th Streets, went online on February 17, 1992. At this time the city went to a secondary treatment biological process, that treats suspended and dissolved solids. This process vastly improves the quality of the treated water Anacortes discharges into the Puget Sound. The treatment plant has an average daily flow of 1.89 million gallons and is permitted for up to 4.5 million gallons per day.

Aerial Photo of the Wastewater Treatment Plant

Drone aerial of WWTP


  • Organization Chart (PDF)
  • Anacortes Rainfall (in inches) this Year, 5 Year and 10 Year Average 

    JanFebMarAprMayJunJulAugSepOctNovDecYear Total
    20231.521.712.521.44.56.45.58.59



    8.78
    5 Year Average3.752.622.011.681.481.40.47.431.652.723.823.1725.08
    10 Year Average2.872.502.071.471.19.92.32.391.242.773.383.0122.08