Thurston County facilities are now open to the public with restrictions, including maintaining physical distancing of at least six feet at all times and, per the Washington State Secretary of Health’s face covering order wearing a cloth face covering or mask. If you come to county facilities, please be prepared for potentially long wait times or lines due to distancing guidelines. We continue to encourage residents to access county services online, by phone, by email, or through the use of drop boxes located outside of county buildings.
The availability of remote services vary by office and department.

Click here for office and department contact information
Click here for information on COVID-19

Storm Drain Inspections & Forms
Basic inspection process for drains, ponds & 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.

Inspection form (Due Annually: August 31st)

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

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

Guidance Pages

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 (PDF)

Constructed Wetlands (PDF)

Pipes, Culverts, Slotted Drains (PDF)

Ditches and Swales (PDF)

Catch Basins (PDF)

Level Spreader, Diffuser (PDF)

Treatment Devices (PDF)

Oil-water Separator (PDF)


Permeable Pavements (PDF)

Bioretention (PDF)

Biofiltration Systems (PDF)

Curb Cuts, Sidewalk Underdrains (PDF)

Storm Vault (PDF)