DC regulates grading and drainage through the Department of Buildings (DOB) and DOEE. Grading permits are required for significant changes to site topography, and all drainage must be directed away from neighboring properties and toward approved stormwater infrastructure.
Under DC's building code and 12A DCMR, grading permits are required for excavation, fill, or changes in grade that affect drainage patterns. Property owners must ensure that grading directs water away from foundations and neighboring properties. Drainage into public space or alleys requires a public space permit from DDOT. New construction must incorporate stormwater management per 21 DCMR Chapter 5. Basement waterproofing and sump pump discharge must comply with DC plumbing codes. Illegal grading that causes flooding on neighboring properties can result in civil liability.
Unpermitted grading can result in stop-work orders, fines from DOB, and orders to restore original grade. Property owners who cause drainage problems for neighbors may face civil liability and code enforcement actions.
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See how Washington's grading & drainage rules stack up against other locations.
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