Stormwater Management: Redmond vs Renton
How do stormwater management rules compare between Redmond, WA and Renton, WA?
Redmond and Renton have similar restriction levels.
Redmond, WA
King County
Redmond is an NPDES Phase II city and enforces Department of Ecology stormwater standards. Development over 2,000 sf of new or replaced impervious surface must mitigate runoff.
View full Redmond rules →Renton, WA
King County
Renton Municipal Code 4-6-030 adopts the King County Surface Water Design Manual. Projects creating or replacing 2,000 sq ft of impervious area must manage runoff to protect local waters.
View full Renton rules →Key Facts Comparison
| Fact | Redmond | Renton |
|---|---|---|
| Permit | NPDES Phase II | - |
| Manual | DOE 2019 Western WA | - |
| Trigger | 2,000 sf new impervious | - |
| Salmon basins | Bear Creek, Sammamish River | - |
| Design manual | - | King County SWDM plus Renton Amendments |
| Threshold | - | 2,000 sq ft new or replaced impervious |
| Small project BMPs | - | Dispersion, rain gardens, permeable pavers |
| Illicit discharge | - | Prohibited under RMC 4-6-030 |
| Report spills | - | Renton Public Works (425) 430-7400 |
Highlighted rows indicate differences between cities.
Redmond FAQ
Do I need a stormwater plan for a Redmond remodel?
Yes if the project creates or replaces more than 2,000 sf of impervious surface, with smaller projects requiring a basic form.
Can I wash my car at home in Redmond?
Private residential car washing is allowed; commercial washing that drains into a storm drain is an illicit discharge and is prohibited.
Renton FAQ
Do I need stormwater review for a 400 sq ft addition?
Usually not, since it falls below the 2,000 sq ft threshold, but cumulative impervious surface on your lot and any critical area issues may still trigger review.
Can I wash my car in the driveway?
Residential occasional car washing is generally tolerated, but commercial washing must route wastewater to the sanitary sewer, never to the storm drain.
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