Permeable resin-bound surfacing can count toward stormwater retention in Washington, DC, but only when it is built as a permeable pavement system with an open-graded reservoir underneath, sized and documented under the Department of Energy and Environment (DOEE) rules. In the District that design work has a cash value: retained gallons can lower the DOEE stormwater fee and DC Water's Clean Rivers charge, or be certified as Stormwater Retention Credits and sold.

The catch is the substrate. A resin-bound layer poured over an old concrete alley pad or asphalt lot drains through its surface and then sheds water off the slab, so it retains nothing and earns nothing. Below: how DOEE counts retention, what DC soils and fill mean for the base, and where the system fits in the District's building stock.

How DOEE counts retention, and where permeable pavement earns its keep

The District's stormwater rule (21 DCMR Chapter 5, last amended in October 2025) covers major projects: generally those disturbing 5,000 square feet or more, and substantial renovations whose building footprint and disturbed area together reach 5,000 square feet. Major land-disturbing projects must retain the runoff from a 1.2-inch storm, and major substantial improvement projects must retain the volume from a 0.8-inch storm. Permeable pavement is one of the green infrastructure practices DOEE expects to see, and the Stormwater Management Guidebook page carries a dedicated permeable pavement plan review checklist.

Two programs turn retention into money. RiverSmart Rewards offers up to 55% off the DOEE stormwater fee and up to 20% off DC Water's Clean Rivers Impervious Area Charge for qualifying green infrastructure, with permeable pavement on the eligible list and approvals that run for three years. The Stormwater Retention Credit (SRC) trading program lets voluntary projects certify retention, where in most cases one SRC equals one gallon of retention for one year, and sell it to regulated sites. Those sites can usually meet up to half of their requirement off site, or all of it in the Gray Combined Sewer System area with a DOEE waiver. The most marketable credits, High-Impact SRCs, come only from voluntary projects that drain to the separate storm sewer (MS4) area.

Neither program approves products. DOEE credits a retention volume that the designer calculates and the agency verifies, so a resin-bound surface course earns a discount or SRCs only as part of a permeable pavement system DOEE accepts, built over a reservoir that actually holds water and maintained for the life of the credit.

Fill, the fall line and combined sewers: what shapes the base in DC

The District sits across the fall line. West of Rock Creek the ground is weathered Piedmont rock and saprolite; east and south, toward the Anacostia and the Navy Yard, it turns to Coastal Plain sands, silts and clays, much of it buried under decades of urban fill. Infiltration rates swing from block to block, so the project engineer will want field tests at the actual paving footprint rather than a soil-survey estimate.

Where tests come back slow, the reservoir under the resin-bound course usually needs an underdrain, and the retention DOEE credits drops accordingly. On former industrial and rail land along the Anacostia, fill can carry contaminants that shouldn't be flushed toward groundwater, which points to a lined, underdrained section. Winter freeze-thaw cycles are another reason to keep the reservoir free-draining so water never sits in the surface course.

About a third of the District drains to DC Water's combined sewer system, and runoff from roofs, driveways and patios adds to pollution in the Anacostia, the Potomac and Rock Creek. Every gallon a properly built permeable section holds back has value here; an overlay that only moves water to the gutter has none.

Where it fits in the District's rowhouses, campuses and courtyards

Rowhouse rear yards and alley parking pads in Capitol Hill, Shaw, Petworth and Bloomingdale, where even a small retention footprint can move a RiverSmart Rewards discount on a single account.
Church lots, private school yards and university quads, where large paved areas make SRC generation worth modeling.
Courtyards and plazas in new mixed-use buildings in NoMa, the Wharf and Navy Yard, where regulated projects usually need on-site retention and a usable paved amenity in the same footprint.
Embassy and office campus walkways along Massachusetts Avenue, where a stone finish suits the setting.

Sidewalks, tree box surrounds and alleys in public space fall under DDOT permitting and standards. Plan resin-bound surfacing for private property unless DDOT agrees otherwise.

Getting a DC project through DOEE review, and where Resin Rock fits

Regulated projects submit a stormwater management plan to DOEE, which reviews retention calculations, infiltration testing, construction details and the maintenance plan. Voluntary retrofits follow the RiverSmart Rewards or SRC certification path instead. Ask the DOEE reviewer early how a resin-bound surface course will be evaluated under the permeable pavement checklist, because the answer affects reservoir depth and the credit you can claim.

Resin Rock makes and supplies the system; it doesn't install it. We ship the UV-stable binder, natural stone blends, trims and the Rock Crete permeable sub-base to District projects, provide technical data sheets for the submittal, and train and approve installers. Request a match through find an installer and we'll usually connect you with an approved installer within 24 hours. If you only want to refresh a sound slab with no stormwater goal, see our concrete resurfacing page for Washington, DC.

Before you specify permeable resin-bound in Washington, DC

Confirm whether the project is regulated under DOEE's rule or is a voluntary RiverSmart Rewards or SRC project.
Run field infiltration tests at the paving footprint; urban fill varies block to block.
Screen for contaminated fill and decide on a liner and underdrain before sizing the reservoir.
Ask DOEE how the resin-bound surface course will be reviewed under the Guidebook's permeable pavement checklist.
Keep the work on private property unless DDOT approves it in public space.
Budget for vacuum sweeping and inspections, since discounts and credits depend on upkeep.

Common questions about permeable resin-bound in Washington, DC

Does a resin-bound driveway qualify for RiverSmart Rewards?

It can, if it is built as a permeable pavement system that retains water and DOEE accepts the design. The discount follows the retention volume your installation provides, not the surface material, and approvals last three years before renewal. A resin-bound overlay on an existing concrete pad that drains to the alley retains nothing, so it would not qualify.

Can I sell Stormwater Retention Credits from a resin-bound parking area?

Possibly. Voluntary green infrastructure that DOEE certifies can generate SRCs, generally one credit per gallon of retention per year. The most marketable type, High-Impact SRCs, comes only from voluntary projects that drain to the separate storm sewer (MS4) area; projects in the combined sewer area earn Low-Impact SRCs with a narrower market. Certification depends on an accepted design, verified construction and ongoing maintenance, so model SRC revenue with your engineer.

What does the Clean Rivers charge have to do with my patio?

DC Water bills the Clean Rivers Impervious Area Charge on impervious area because runoff from roofs, driveways and patios feeds the sewer system. RiverSmart Rewards participants can receive up to 20% off that charge on top of the DOEE fee discount, but only for green infrastructure DOEE approves and that you keep maintained.

Official sources for Washington, DC

Local rules change. We last checked these sources in October 2026. Confirm current requirements with the reviewing agency before you design, and treat this page as a starting point, not engineering or permitting advice.

Permeable Resin-Bound Surfacing in Washington, DC