Private Stormwater System Maintenance

What is a Stormwater Management System?

Stormwater systems are the infrastructure that capture and transport stormwater runoff before it flows into our streams, lakes and Puget Sound.  Private stormwater systems often include features such as stormwater ponds, swales, ditches, pipes, catch basins and sometimes filters.    

Maintaining Your Stormwater System

Stormwater systems need regular cleaning and maintenance to effectively manage stormwater runoff. This helps prevent localized flooding and protects the health and quality of our community's waterways.

Most private property owners have a binding agreement with the City that addresses the long-term management of their stormwater system. The City will do a yearly audit to verify the upkeep of your stormwater system. Property owners are responsible for completing a Stormwater Facility Maintenance Summary Form (Summary Form) and submitting it to the City yearly before July 31

Need more information on managing your stormwater system?

To keep your stormwater system functioning properly and stay in good standing with your city agreement, follow the steps below:

  1.     Inspect your Stormwater System

Select the appropriate sections from the Stormwater Facility Checklist document that apply to your system. The checklists provide guidance information on how to inspect and maintain specific features of your stormwater system.

  2.     Complete maintenance and fix problemsMaintaining a storwater facility

Some maintenance may require a qualified or certified service professional, such as treatment vaults and filters (view inspection and maintenance specs for different filters). You may need to contact different contractors for different types of services (such as sweeping, pond landscaping and vactoring catch basins - see information and link at the bottom of page). All maintenance work should follow plan specifications and manufacturer’s recommendations.

  3.     Return form and backup documentation

Complete the Summary Form and return it with checklists, invoices and photos, before July 31 of each year to:

Tami Tonder, City of Olympia Public Works
Mail: PO Box 1967, Olympia WA 98507
Phone: 360.753.8579

Note: you are required to provide proof/invoices for ALL media filter and treatment cartridge replacements. Important flagstormwater vault


Professional Service Providers

This list of vendors does not constitute or imply recommendation or endorsement by the City of Olympia. We make no warrantee of services provided. Please do your own reference checking and verification when selecting a provider for servicing your system. This list is provided and maintained by Thurston County. 

Find out if your provider is Contech certified here.



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