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Private Stormwater Maintenance Program

The City works with property owners to ensure routine inspection and maintenance of all private stormwater systems. Proper maintenance ensures the system continues to function as designed. It also helps keep our creeks and lakes clean, and helps prevent flooding and erosion.

Private Maintenance Resources
Dry Well Maintenance (PDF - 1.3MB)
Permeable Pavement Maintenance (PDF - 2.5MB)
Infiltration Trench Maintenance (PDF - 6.7MB)
Drainage System Maintenance Contractors (PDF -77kb)

Understanding Your Stormwater System

Typical stormwater systems have many parts to carry runoff from your property.  These parts may include:

  • Roof drains and underground pipes
  • Catch basins and yard drains
  • Swales, culverts, and ditches
  • Oil/water separators
  • Buried retention, detention, and infiltration vaults and pond

Retention and detention facilities prevent flooding and reduce pollution by storing stormwater in ponds or underground vaults. These facilities slow the rate of runoff and also allow pollution to settle out before the water enters our creeks and lakes.

Stormwater System Inspection Process

Inspection of private stormwater systems occurs at least every other year:

  1. The City notifies property owners by letter when it is time for their next inspection.

  2. The City inspects the drainage system and works with the property owner to familiarize them with their system and how to maintain it.

  3. Staff will notify the property owner if a system does not meet Kirkland’s maintenance standards. Upon notification, the property owner will be responsible for completing the necessary maintenance.

  4. If maintenance is required, you will need to fill out and submit a Certificate of Completion (PDF) when the work is complete.

Maintaining Your Stormwater System

Maintenance requirements for stormwater facilities are in Appendix A of the 2009 King County Surface Water Design Manualexternal link icon. Typical stormwater system maintenance requirements might include:

  • Cleaning contaminated sediment/liquids from ponds, pipes, catch basins, and manholes
  • Repairing/replacing control stuctures

Prevent materials stored outside from leaking, draining, spilling or dumping into the stormwater system. Keeping contaminants out of your system reduces disposal costs for materials cleaned from the system.

Cost of Maintenance

Maintenance costs depend on both the type and the condition of the existing system. The cost for maintenance can vary due to depth, location and number of structures.

Drainage Maintenance Service

The City provides a list of local firms that provide drainage maintenance services. Firms Providing Drainage Maintenance Service (PDF 77kb).

Certificate of Completion

You and your contractor should fill out the Certificate of Completion (PDF). Please include all maintenance done on your system since the date it was inspected by the City. If you hired a contractor to perform the maintenance, have them sign the form as well.

Submit the completed form to the Stormwater Division, Kirkland Public Works Department.

Questions? Please call 425-587-3800 or contact us via the Our Kirkland Customer Service Portal.

Public Works
123 5th Avenue, Kirkland WA 98033
T. 425-587-3800 | F. 425-587-3807
Mon-Fri, 8 a.m. to 5 p.m.

Operations & Maintenance
915 8th St, Kirkland WA 98033
T. 425-587-3900 24/7 | F. 425-587-3902
Mon-Fri, 6:30 a.m.-3:30 p.m.

General Inquiries - Contact us via the: 
Our Kirkland Customer Service Portal