Erosion Control: Redmond vs Renton
How do erosion control rules compare between Redmond, WA and Renton, WA?
Redmond and Renton have similar restriction levels.
Redmond, WA
King County
Redmond requires construction-phase erosion and sediment control BMPs on any ground disturbance over 2,000 sf under RMC Title 15 and the DOE Stormwater Manual, with daily inspection during wet season.
View full Redmond rules →Renton, WA
King County
Renton requires Temporary Erosion and Sediment Control plans on sites disturbing 7,000 square feet or more. Silt fences, wattles, and stabilized entrances are required per the King County SWDM.
View full Renton rules →Key Facts Comparison
| Fact | Redmond | Renton |
|---|---|---|
| Trigger | 2,000 sf disturbance | - |
| SWPPP | Required with permit | - |
| Wet season | Oct 1 to Apr 30 | Oct 1 to Apr 30 tighter controls |
| State permit | 1 acre triggers CSWGP | Ecology CSWGP for 1+ acre sites |
| TESC threshold | - | 7,000 sq ft disturbance |
| Required BMPs | - | Silt fence, wattles, entrance, inlet protection |
| Salmon habitat | - | Cedar River sediment discharge serious |
Highlighted rows indicate differences between cities.
Redmond FAQ
Do I need silt fence for a small Redmond addition?
For most ground disturbance over 2,000 sf, yes, along with other erosion BMPs during the entire project.
Can I keep bare soil exposed over winter?
No, during the Oct 1 to Apr 30 wet season disturbed soils must be stabilized with mulch, cover, or grass.
Renton FAQ
Does a small yard project need erosion control?
Yes if disturbance exceeds 7,000 sq ft. Even smaller projects should use basic BMPs like silt fences to prevent sediment from leaving the site.
Who inspects erosion control on construction sites?
Renton Public Works and CED inspectors verify TESC installation during construction, and Ecology oversees the state construction stormwater permit for larger sites.
Compare other topics
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