Takoma Park, MD Environmental Rules: Grading & Drainage (2026)

Grading and drainage in Takoma Park is regulated by Montgomery County Department of Permitting Services under Chapter 19 of the county code. A grading permit is required for any earth-disturbing activity that alters the existing grade or drainage pattern of a property, including excavation, fill placement, and regrading. Projects disturbing 5,000 or more square feet require a formal grading plan prepared by a licensed professional engineer. The plan must show existing and proposed grades, drainage flow directions, erosion and sediment control measures, and stormwater management facilities. A fundamental principle is that post-construction drainage must not increase the rate or volume of runoff onto neighboring properties. Redirecting drainage that historically flowed one direction onto adjacent property is prohibited. Retaining walls, swales, and grading near property lines must be carefully designed to manage water on-site. Even small residential projects like patio grading or driveway installation must not adversely affect neighboring drainage. The Washington Suburban Sanitary Commission (WSSC) manages public storm drainage infrastructure. Connections to the public storm drain system require WSSC approval. Property owners experiencing drainage issues from neighboring development should contact Montgomery County DPS. Takoma Park Public Works at 301-891-7633 handles city-maintained drainage infrastructure and can investigate stormwater complaints.