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Mercer Island staff outline stormwater maintenance and new NPDES requirements
Summary
City stormwater staff reported routine maintenance, inspection numbers and 2025 illicit discharge counts, and summarized new NPDES permit requirements including a stormwater management program for existing development, a tree‑canopy goal and a dumpster‑lid behavior campaign.
City stormwater staff presented an annual maintenance and National Pollutant Discharge Elimination System (NPDES) update to the Mercer Island Utility Board on March 10.
Brian Harvickson, right‑of‑way and stormwater manager, provided system totals and recent activity: 357 outfalls to Lake Washington, 5,801 public catch basins (5,540 inspected during the last two‑year cycle), 83 miles of stormpipe, 13 miles of open ditches and nine miles of open watercourses. Harvickson said the city hauled about 175 cubic yards of decanted sump material…
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