Industrial Pretreatment

The purpose of the city’s Pretreatment Program is to prevent the introduction of harmful pollutants into the sewer system which could:
  • Degrade the quality of our municipal digested bio solids
  • Negatively affect the sanitary sewer or its operations
  • Pass through the treatment plant and contaminate the Willamette River
Another primary objective of the Pretreatment Program is to improve opportunities to recycle or reclaim our sewer system’s wastewater and bio solids. Read the Industrial Pretreatment Brochure for an in depth look at the pretreatment process and who is required to obtain a permit.

Industrial Pretreatment Environmental Survey with RCRA Notification

Fats, Oil & Grease


Industrial Pretreatment staff also work with businesses and citizens to keep fats, oils, and grease (FOG) from damaging plumbing pipes, the collection system, the wastewater treatment plant, and the environment.

For more information on FOG, watch the following videos:

FOG Best Management Practices


Safely Disposing of Drugs


The city has installed a permanent drug take back box located in the Public Works Building located at 30000 Southwest Town Center Loop East. Community members can drop off unwanted prescription drugs Monday through Friday from 8 a.m. to 4:30 p.m., excluding holidays.

Unused drugs kept in medicine cabinets, tossed in the garbage, or flushed down the toilet or drain can be serious threats to human and environmental health. Drugs of concern include controlled and non-controlled prescription drugs, as well as over-the-counter medications. You can drop these kinds of drugs into the box no questions asked.

For more information on Wilsonville’s Pretreatment Program, call 503-570-1551.