Stormwater permits in City of Kent: fees, timeline & requirements (2026)
Everything you need to know about pulling a stormwater / drainage permit in City of Kent, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Kent uses MyKent permits portal..
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to City of Kent's source.
When does a stormwater / drainage need a permit in City of Kent?
Ecology's Stormwater Management Manual for Western Washington (SWMMWW, 2024 edition) is the state floor. A municipal stormwater permittee may instead adopt a REGIONAL manual Ecology has determined equivalent, and most do — some counties publish their own, some cities publish their own, and others adopt Ecology's directly. WHICH MANUAL APPLIES IS A PER-JURISDICTION FACT and it changes the numbers: review thresholds for new plus replaced impervious surface and for land-disturbing activity differ between manuals, so read this jurisdiction's own adopting chapter before quoting one. Critical-area and closed-basin parcels get stricter review under every manual.
From City of Kent's own code
“A permit is required for all work to construct, install, modify, place, or attempt to construct, install, modify, or place any storm or surface water drainage structure or facility within the city and must be obtained before any work begins.”Source ↗verified 2026-09-07
Required submittals
- drainage report (full or simplified)
- site plan with impervious calc
- BMP / facility detail
- geotech if infiltration claimed
Inspection sequence
- pre-construction (BMPs in place)
- facility installation
- final stabilization
Contractor specialties needed
general
Who can do this work in City of Kent?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout City of Kent and King County. Kolmo prepares the drawings and submittals, files the stormwater / drainage permit with Kent uses MyKent permits portal., carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a City of Kent stormwater / drainage quote.
Notes & caveats
Issuing body is city public works / county DPER, often parallel to the building permit. On-site infiltration / detention required where infeasible to discharge to municipal storm. Critical-area parcels (steep slope, salmon-bearing watercourse) get more conservative review.
Stormwater permit fee estimate in City of Kent
Worked example for a $25,000 stormwater / drainage project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $391.25 |
| Plan review | $254.31 |
| WA state surcharge | $6.5 |
| Estimated total | $652.06 |
Drainage review fee commonly tiered by project size; small project ~$300-$800, full drainage review $1,500+. Apply via https://mybuildingpermit.com. Computed from the City of Kent fee bracket schedule · source ↗. Impact/utility fees may apply separately.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Kent stormwater / drainage — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (4).
- 3. Submit through the city portal: Kent uses MyKent permits portal. ↗
- 4. Track review (typical: —). Respond to reviewer comments promptly.
- 5. Pay issuance fees (Drainage review fee commonly tiered by project size; small project ~$300-$800, full drainage review $1,500+. Apply via https://mybuildingpermit.com.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull stormwater / drainage permits in City of Kent every month. We prepare the drawings and submittals, file with Kent uses MyKent permits portal., handle reviewer comments, and build the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Stormwater permits in City of Kent — FAQ
When does a stormwater / drainage need a permit in City of Kent?
Ecology's Stormwater Management Manual for Western Washington (SWMMWW, 2024 edition) is the state floor. A municipal stormwater permittee may instead adopt a REGIONAL manual Ecology has determined equivalent, and most do — some counties publish their own, some cities publish their own, and others adopt Ecology's directly. WHICH MANUAL APPLIES IS A PER-JURISDICTION FACT and it changes the numbers: review thresholds for new plus replaced impervious surface and for land-disturbing activity differ between manuals, so read this jurisdiction's own adopting chapter before quoting one. Critical-area and closed-basin parcels get stricter review under every manual.
How much does a stormwater / drainage permit cost in City of Kent?
For a $25,000 stormwater / drainage project, the estimated City of Kent permit fee is about $652.06 — building fee $391.25 + plan review $254.31 + surcharges. Fees scale with project valuation per the city schedule.