Private Stormwater System Inspection Program

The City of SeaTac Public Works Department conducts a limited number of annual inspections of private stormwater systems to ensure stormwater facilities are being maintained and functioning properly. Private stormwater systems can include detention, flow control and water quality treatment facilities, which reduce peak stormwater flows and capture pollutants carried by stormwater. Proper maintenance of these facilities is necessary to protect our downstream waterways from flooding and water quality impacts, as well as to comply with federal and state regulations. 

Useful Links

SeaTac Municipal Code 12.10

King County Surface Water Design Manual, Appendix A

Stormwater System Inspection Checklist

Stormwater Inspection Contractors

Stormwater Inspection Tips

Frequently Asked Questions (FAQs)

Q: Why do I have to provide access to my property for storm system inspections?

A: Pursuant to SMC 12.10.180 A & B, the City is authorized to conduct inspections and take actions as may be required to enforce provisions of the code.

Q: Why do stormwater inspections need to be done?

A: The City conducts limited inspections of private drainage systems to ensure stormwater facilities are being maintained and functioning properly. [Please note: Pursuant to SeaTac Municipal Code (SMC) 12.10.160, property owners are responsible for the maintenance and repair of the storm water facility on their property.]

Q: How do I qualify/apply for a rebate on my stormwater fees?

A: Pursuant to SMC 12.10.225.E, nonresidential properties which contain one or more retention/detention facilities, or equivalent, which are designed, engineered, and maintained to the standards of the King County Surface Water Design Manual Appendix A, are entitled to a rebate equal to twenty-five percent (25%) of the annual surface water management fee for the acreage served by each facility.

 2024 Rebate Application Form