Erosion Control: Federal Way vs Redmond
How do erosion control rules compare between Federal Way, WA and Redmond, WA?
Federal Way and Redmond have similar restriction levels.
Federal Way, WA
King County
Federal Way requires Temporary Erosion and Sediment Control (TESC) plans for construction projects disturbing 7,000 sf or more per state rules. Silt fencing, cover, and stabilized entrances are standard.
View full Federal Way rules →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 →Key Facts Comparison
| Fact | Federal Way | Redmond |
|---|---|---|
| TESC trigger | 7,000 sf disturbance | - |
| Wet season | Oct-Apr, 2-day cover rule | Oct 1 to Apr 30 |
| Required BMPs | Silt fence and gravel pad | - |
| State permit | Over 1 acre | 1 acre triggers CSWGP |
| Trigger | - | 2,000 sf disturbance |
| SWPPP | - | Required with permit |
Highlighted rows indicate differences between cities.
Federal Way FAQ
Do small house projects need erosion control?
Small single-family remodels below 7,000 sf disturbance can use homeowner-level BMPs without a formal TESC plan.
What happens if silt leaves my site?
Federal Way can issue stop-work orders and fines, and the Department of Ecology can separately penalize under the construction permit.
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.
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