Erosion Control: Gaithersburg vs Rockville
How do erosion control rules compare between Gaithersburg, MD and Rockville, MD?
Gaithersburg and Rockville have similar restriction levels.
Gaithersburg, MD
Montgomery County
Gaithersburg requires erosion and sediment control plans for all land-disturbing activities exceeding 5,000 square feet or 100 cubic yards of earth movement. Plans must be approved by Montgomery County before grading permits are issued. Sediment controls must be installed and maintained throughout construction. Maryland enforces some of the strictest erosion standards in the country due to Chesapeake Bay protections.
View full Gaithersburg rules →Rockville, MD
Montgomery County
Rockville requires erosion and sediment control plans for earth-moving activity that disturbs 5,000 square feet or more of land or 100 cubic yards or more of soil. Plans are reviewed and approved under Article V, Chapter 19 of the Rockville City Code. Sediment basins, slope stabilization, and drainage controls must be installed before grading begins.
View full Rockville rules →Key Facts Comparison
| Fact | Gaithersburg | Rockville |
|---|---|---|
| Plan Threshold | 5,000 sq ft or 100 cubic yards | - |
| Stabilization Deadline | 14 days (7 days wet season) | - |
| Inspection Trigger | Within 24 hours of 0.5-inch rain | - |
| County DPS | (240) 777-6370 | - |
| State Authority | Maryland Dept of Environment | - |
| Code Reference | - | Chapter 19, Article V |
| Disturbance Threshold | - | 5,000 sq ft or 100 cu yd |
| Max Slope | - | 3:1 in lawn areas |
| Standing Water Limit | - | 24 hours after rainfall |
| Contact | - | 240-314-8567 |
Highlighted rows indicate differences between cities.
Gaithersburg FAQ
When do I need an erosion control plan in Gaithersburg?
An erosion and sediment control plan is required for any land-disturbing activity affecting 5,000 square feet or more of area or involving 100 cubic yards or more of earth movement.
Who approves erosion plans?
Montgomery County Department of Permitting Services reviews and approves erosion and sediment control plans. Plans must follow Maryland Standards and Specifications.
How quickly must disturbed areas be stabilized?
Disturbed areas must be stabilized within 14 days of final grading, or within 7 days during the wet season from October through March.
Rockville FAQ
When do I need an erosion and sediment control plan in Rockville?
A plan is required for any earth-moving activity that disturbs 5,000 square feet or more of land or moves 100 cubic yards or more of soil. Plans must be approved before grading begins.
What slope limits apply?
No permanent cut or fill slope steeper than 3:1 is permitted in lawn maintenance areas. Slopes must be stabilized and surface drainage must be controlled by dikes or mechanical devices.
What happens if I grade without a permit?
The city will issue a stop-work order and may impose daily fines. MDE may also take separate enforcement action for sediment discharge into waterways.
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