Erosion Control: Mount Vernon vs Yonkers
How do erosion control rules compare between Mount Vernon, NY and Yonkers, NY?
Mount Vernon and Yonkers have similar restriction levels.
Mount Vernon, NY
Westchester County
Soil erosion and sediment control required on land-disturbing activities per NYS DEC SPDES general permit (GP-0-20-001) for 1+ acre sites. City enforces stormwater/erosion standards at building permit review.
View full Mount Vernon rules →Yonkers, NY
Westchester County
Yonkers requires erosion and sediment control plans for soil disturbance of 1 acre or more under the NYS SPDES General Permit GP-0-20-001. Smaller sites follow Yonkers Code stormwater and grading provisions.
View full Yonkers rules →Key Facts Comparison
| Fact | Mount Vernon | Yonkers |
|---|---|---|
| Threshold | 1 acre triggers SPDES | 1 acre disturbance |
| SWPPP | Required 1+ acre | - |
| Standard | NY Blue Book 2016 | - |
| Review | Building Department | - |
| Permit | - | NYS SPDES GP-0-20-001 |
| Stabilization | - | Within 14 days |
| DEC Fine | - | Up to $37,500/day |
Highlighted rows indicate differences between cities.
Mount Vernon FAQ
Do I need erosion controls for a small addition?
Typically silt fence and inlet protection are required even for small projects at plan review.
When does a full SWPPP become mandatory?
At 1 or more acres of disturbance — a SWPPP and Notice of Intent to NYS DEC are required under the SPDES permit.
What standard does Mount Vernon use for erosion controls?
The NY Standards and Specifications for Erosion and Sediment Control (2016 Blue Book), enforced at Building Department review.
Yonkers FAQ
Does my home addition need an erosion plan?
Only if soil disturbance is 1 acre or more. Smaller projects follow Yonkers city site plan review instead of NYS SPDES requirements.
What happens if I violate NYS erosion control rules in Yonkers?
Projects disturbing 1+ acre without an approved SWPPP under NYS SPDES GP-0-20-001 can face NYS DEC fines up to $37,500 per day.
How quickly must disturbed soil be stabilized in Yonkers?
Under NYS SPDES GP-0-20-001, disturbed soil must be stabilized within 14 days of final grading. Silt fence and stabilized construction entrances are required throughout the project.
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