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Thurston County, Washington

The content on the Thurston County website is currently provided in English. We are providing the “Translation” for approximately 10 languages. The goal of the translation is to provide visitors with limited English proficiency to access information on the website in other languages. The translations do not translate all types of documents, and it may not give you an exact translation all the time. The translations are made through an automated process, which may not result in accurate or precise translations, particularly of technical and legal terminology.

Community Planning and Economic Development

Basic Inspection Process for Drains, Ponds and Other Stormwater Facility Types

We send inspection forms annually to property owners, business owners or Homeowner Associations (HOAs)  – whoever is responsible for maintaining the facility. Please use these forms to identify any type of maintenance that may be required, and the date by which the work will be completed. Then send the completed form back to us. If you have questions about your facilities or need help completing our forms, please call us, we're happy to help.

Inspectors may perform a site visit where they check catch basins, storm drain inlets, flow control structures, detention ponds, tanks, vaults, treatment systems, and oil/water separators. They look for high sediment levels, missing or broken components, drainage problems, and invasive or noxious vegetation.

If they find that maintenance or repairs are needed, we'll send you a report detailing the issue.  After you fix the problem or schedule the repair, please complete a new inspection form and send it back to us.

Click on the form below to open it. Download it, fill it out, and save to your computer. 

Inspection Form (fillable PDF)

If you run into issues with the form try these tips:

1) Ensure you have the most up-to-date version of Adobe Acrobat Reader DC (download it here).

2) Use Chrome as your web browser (download it here).

Email it to us at:

Or mail it to Stormwater Utility: 
9605 Tilley Rd. South 
Olympia, WA 98512

Each neighborhood pond in Thurston County (outside of the Cities of Lacey, Olympia and Tumwater) is eligible for a 1-time FREE Dumpster delivery, pick-up & disposal to assist them with a community stormwater pond vegetation removal effort.

Program details & requirements: FREE Dumpster Program for Thurston County Neighborhoods

Download, fill out, save and submit this application form: FREE Dumpster Program Application (fillable PDF)

If you run into issues with the forms try these tips:

1) Ensure you have the most up-to-date version of Adobe Acrobat Reader DC (download it here).

2) Use Chrome as your web browser (download it here).


Email the completed application to us at:

Or mail it to Stormwater Utility:
9605 Tilley Rd. South 
Olympia, WA 98512

If you need technical assistance, please contact our Residential Stormwater Inspector at (360) 867-2079.

These one-page guidance documents explain each facility type and their respective maintenance guidelines. Download the one-pager for each facility type present at your site and use it to assist in completing the annual inspection form.

Wet and Dry Ponds 

Constructed Wetlands

Pipes, Culverts, Slotted Drains 

Ditches and Swales

Catch Basins

Level Spreader, Diffuser

Treatment Devices

Oil-water Separator 


Permeable Pavements


Biofiltration Systems

Curb Cuts, Sidewalk Underdrains

Storm Vault