All of the wastewater is transported via an underground network of piping and pump stations
called the Collection System to the Wastewater Treatment Plant located on Louis Perras Rd.
The Wastewater Treatment Plant is one of the City’s most expensive and complicated facilities.
The wastewater is processed through several physical and biological treatment processes and
finally disinfected through an ultraviolet light exposure process that kills all harmful bacteria
before being discharged to the Colville River. The treated discharge or effluent meets or
exceeds stringent water quality parameters before it is discharged.
The fragile biological treatment process commissions the services of millions of microorganisms
to perform the lengthy treatment functions. In order to protect the populations of microorganisms
from toxic discharges of illegal substances, the City administers a pre-treatment program to help
ensure the high quality of our effluent and biosolids, and to remain in compliance with our state
If you are having a sewer issue that you would like to report please Call 509-684-2244. If you
are having an after-hour sewer emergency please call the Dispatch center after-hours
emergency number: 509-684-2555