City of Wenatchee buildings are closed to the public at this time. Please read the City Services Update for more information. The City of Wenatchee is working with local partners to provide accurate information about the Coronavirus (COVID-19) to the public. If you have symptoms and reasons to believe your symptoms are connected to COVID-19, please call your healthcare provider. If you have any questions about what is happening in Washington and how the virus is spread, visit the Washington State Department of Health website at:

Sanitary Sewer

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The Wastewater System

The City of Wenatchee provides sanitary sewer services to all residences within the City limits, north of the Wenatchee River bridge in Olds Station and in portions of the Sunnyslope area within the Growth Management Boundary.

Sewer Plans
The following plans have been adopted by the Wenatchee City Council.

Sewer Comprehensive Plan Final (pdf)

Wastewater Treatment Facilities Plan Update (pdf)

 If you have any questions, comments or would like more information, please contact Jessica Shaw at 509-888-3225 or

Collection and Treatment City of Wenatchee Wastewater Treatment Plant UV building and secondary clarifier
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 Worthen Street. 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 Columbia 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 bacteria to perform the lengthy treatment functions. In order to protect the populations of bacteria from toxic discharges of illegal substances, the City administers a pre-treatment program to help ensure the high quality of our effluent and biosoilds, and to remain in compliance with our state discharge permit. 

If you are having a sewer issue that you would like to report please click here to fill out a citizen request form using Water and Utility - Sewer Issue for the topic.  If you are having an after-hour sewer emergency please call (509) 665-2236.

City of Wenatchee's Waste Water Treatment PlantUpgrades
The latest treatment plant upgrade was completed in the fall of 2013.  The project brought the plant current with the new regulatory requirements, reduced odors form the treatment process, provided architectural enhancements and added landscaping to improve the facilities appearance. 

To view the information provided during the ribbon cutting ceremony please click here.

Disposable Does Not Mean Flushable

As wastewater enters the treatment plant the garbage must be screened out to prevent plugs and pump failures. The material removed from the wastewater influent must then be bagged and hauled to the landfill. Sometimes the garbage that gets disposed in the sewer system does not make it to the treatment plant. The garbage gets stuck in the sewer lines and in lift station pumps, which can result in sanitary sewer overflows. A sanitary sewer overflow can result in the sewage backing up into houses or into the streets. This creates a large mess and is costly to clean up.

Note that even wipes that are labeled as "flushable" should not be flushed down the toilet. These wipes do not disperse quickly like toilet paper, they can stay intact all the way to the treatment plant.

Disposal of Unused Medicines
When medicines are no longer needed it’s important to dispose of them properly to avoid harm to others or the environment.  The best way to dispose of unused medicines is to participate in a take-back program. 

Confluence Health participates in the National Prescription Drug Take-Back Program to provide a safe, convenient, and responsible means to dispose of prescription drugs.  Click here to view MedSafe drug collection and disposal receptacles.

The following links will provide additional information on how to dispose of unused medicines.

Visiting the Waste Water Treatment Plant

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