Erosion Control: Auburn vs Redmond
How do erosion control rules compare between Auburn, WA and Redmond, WA?
Auburn and Redmond have similar restriction levels.
Auburn, WA
King County
Auburn requires temporary erosion and sediment control (TESC) plans for clearing and grading per ACC Title 15 and the Ecology stormwater manual, with wet-season rules limiting soil disturbance from October to April.
View full Auburn 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 | Auburn | Redmond |
|---|---|---|
| Code | ACC 15 + Ecology Manual | - |
| TESC Threshold | 7,000 sq ft typical | - |
| Wet Season | Oct 1 to Apr 30 | - |
| Stabilization | Required after grading pause | - |
| Discharge | Muddy water prohibited | - |
| Trigger | - | 2,000 sf disturbance |
| SWPPP | - | Required with permit |
| Wet season | - | Oct 1 to Apr 30 |
| State permit | - | 1 acre triggers CSWGP |
Highlighted rows indicate differences between cities.
Auburn FAQ
Do I need a TESC plan for a small landscaping project?
Most small residential landscape projects fall below thresholds, but any work on Lea Hill or West Hill steep slopes, near streams, or over 7,000 square feet generally requires a TESC plan.
Can I continue excavation in November?
Wet-season rules reduce the allowable exposed area and add stabilization deadlines. Projects must plan for rapid covers, mats, or seeding between grading phases.
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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