The City of Kirkland works with local property owners to ensure that all private stormwater systems receive routine inspection (at least every other year) and maintenance. This helps these systems to function as they were designed and to prevent flooding, erosion and water quality degradation.
Private Maintenance Resources
Dry Well Maintenance (PDF - 1.3MB)
Permeable Pavement Maintenance (PDF - 2.5MB)
Infiltration Trench Maintenance (PDF - 6.7MB)
Typical stormwater systems consist of some combination of roof drains, underground pipes, catch basins, swales, culverts, ditches, oil/water separators, and manmade retention, detention and infiltration vaults and ponds.
Retention and detention facilities prevent flooding and reduce contamination by temporarily storing stormwater in ponds or underground vaults with control structures. These facilities slow the rate of runoff and also allow suspended contaminants to settle out or be removed before the water enters our creeks and lakes.
Private stormwater systems are inspected on a regular basis, at least every other year:
- The City of Kirkland will notify property owners by letter when it is time for their next stormwater system inspection.
- The City will inspect the storm drainage system and then work with the property owner to familiarize them with their system and how to best maintain it.
- If a particular system does not meet Kirkland’s maintenance standards, the property owner will be notified by letter of any needed maintenance. Upon notification, the property owner will be responsible for completing the necessary maintenance.
- If maintenance is required, you will need to fill out and submit a Certificate of Completion (PDF) when the work is finished.
Prevent materials that are stored outside from leaking, draining, spilling or being dumped into the stormwater system. Keeping contaminants out of your stormwater system may reduce the disposal costs for materials cleaned from your system.
Kirkland's maintenance requirements for typical stormwater facilities can be found in Appendix A of the 2009 King County Surface Water Design Manual. Typical stormwater system maintenance requirements might include: cleaning contaminated sediment and liquids from detention ponds, underground pipes, catch basins, and manholes or repairing control structures.
Maintenance costs depend on both the type and the condition of the existing system. The cost for maintenance each time it is required can vary greatly due to depth, location and number of structures.
If your stormwater system requires maintenance, we will provide you with a list of local firms that provide drainage maintenance services. You can also download a list of firms: Firms Providing Drainage Maintenance Service.
The Certificate of Completion (PDF) should be filled out by you or your contractor. Please include all maintenance that has been performed 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.