Environmental Rules in Gaithersburg, MD (2026)
4 verified environmental rules for Gaithersburg, Maryland, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Gaithersburg enforces stringent stormwater management requirements under its NPDES Municipal Separate Storm Sewer System (MS4) permit administered through Montgomery County DEP and the WSSC service area. All development and redevelopment projects disturbing 5,000 square feet or more must implement environmental site design to the maximum extent practicable. Residential properties must manage stormwater runoff on site.
Gaithersburg Stormwater Management Requirements
Heavy RestrictionsErosion Control
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.
Gaithersburg Erosion and Sediment Control Rules
Heavy RestrictionsFlood Zones
Gaithersburg participates in the National Flood Insurance Program and enforces strict floodplain management regulations. Development in FEMA-designated Special Flood Hazard Areas is heavily restricted. New residential construction in the floodplain must be elevated at least 1 foot above the base flood elevation. Substantial improvements exceeding 50 percent of market value trigger full floodplain compliance.
Gaithersburg Flood Zone and Floodplain Regulations
Heavy RestrictionsGrading & Drainage
Gaithersburg requires grading permits for land-disturbing activities and enforces drainage standards to protect adjacent properties and waterways. Grading must maintain positive drainage away from structures and must not redirect stormwater onto neighboring properties. Montgomery County reviews grading plans in coordination with the city for projects meeting disturbance thresholds.
Gaithersburg Grading and Drainage Requirements
Heavy RestrictionsCity of Gaithersburg Public Works Department – Engineering Services & Environmental Services Divisions
The Public Works Department performs a variety of services including snow removal, street sweeping, repair and maintenance of streets, sidewalks and storm drains, and beautification of streets, public buildings, and parks. Recycling, city vehicle maintenance and stormwater management are also provided. Engineering functions include reviews of site plans, sediment control, storm drainage, paving...
Looking for Montgomery County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Gaithersburg city rules.
Environmental Rules in Montgomery County →