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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

More Contact Info

O&M Plans - by Facility Type

It is essential to maintain your stormwater facility in accordance with your approved Operation & Maintenance, or O&M Plan.  Your O&M Plan was likely required to be submitted at the time of project development and permitting.  Copies of standard O&M Plans are provided here, depending on the type of facility you have. 

Proper maintenance will help the stormwater facility function as intended and limit offsite environmental impacts. Check your facilities regularly to determine maintenance needs. Routine inspection and maintenance can help keep overall maintenance costs at a minimum by detecting problems early and avoiding large repair or replacement costs.


Vegetated swale systems, including infiltration or flow-thru swales

Drywell or Soakage Trench

These facilities are sometimes referred to as Underground Injection Controls, or UICs.


Typically a vegetated facility within a concrete box structure

Oil-Water Separator

An in-ground vault that collects sediment and oils