Maintenance requirements for stormwater facilities are in Appendix A of the 2021 King County Surface Water Design Manual. Typical stormwater system maintenance requirements might include:
- Cleaning contaminated sediment/liquids from ponds, pipes, catch basins, and manholes
- Repairing/replacing control structures
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.
The City provides a list of local firms that provide drainage maintenance services: Drainage Maintenance Contractor List(PDF, 112KB).