Rockville holds a Municipal Separate Storm Sewer System (MS4) permit from the Maryland Department of the Environment and enforces stormwater management requirements for all development that disturbs 5,000 square feet or more. Stormwater management plans must conform to the latest MDE Design Manual. The city operates under National Pollutant Discharge Elimination System (NPDES) requirements to protect local waterways.
The City of Rockville holds an MS4 permit under the NPDES program issued by the Maryland Department of the Environment (MDE). This permit requires the city to manage stormwater runoff to protect water quality in Rock Creek, Watts Branch, and other tributaries of the Potomac River watershed. Development projects that disturb 5,000 square feet or more of land area or move 100 cubic yards or more of soil must submit stormwater management plans for review and approval. Plans must conform to the latest version of MDE's Stormwater Design Manual and incorporate environmental site design (ESD) practices to the maximum extent practicable. ESD techniques include rain gardens, bioretention facilities, permeable pavement, green roofs, and infiltration practices. Rockville requires stormwater management concept approval before detailed engineering plans are submitted. All stormwater facilities must be maintained by the property owner or a designated maintenance entity. The city conducts inspections of private stormwater management facilities to ensure ongoing compliance. Stormwater permits are applied for online through the city's permitting portal. Contact the Department of Public Works at 240-314-8567 for stormwater inquiries.
Failure to obtain a stormwater management permit before grading or construction may result in a stop-work order and fines. Violations of MS4 permit conditions can result in civil penalties from MDE. Failure to maintain private stormwater facilities may trigger enforcement action. The city inspects facilities and issues correction notices for non-compliant systems.
Rockville, MD
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Rockville, MD
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Rockville, MD
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Rockville, MD
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Rockville, MD
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Rockville, MD
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