Permeable resin-bound surfacing can be used for stormwater in Frederick, but karst geology changes the usual approach: across much of the Frederick Valley, concentrating water into limestone can open sinkholes, so a permeable section here is often lined and underdrained rather than built to infiltrate. Designed that way, over an open-graded reservoir and accepted by the City or County reviewer, it can still treat runoff and support a fee credit.

What it can't do is turn an existing slab into a stormwater practice. A resin-bound overlay on a concrete driveway or patio drains through the surface layer and then runs off the slab. This page covers the City of Frederick's utility fee and credits, karst and winter conditions, likely uses and the review path.

The City's utility fee, ESD credits and the County's restoration work

The City of Frederick bills a stormwater management utility fee on impervious surface: impervious square footage is divided by 1,000 and multiplied by the unit rate, and residential properties are assessed with a percent impervious factor applied to lot area. Owners can apply for credits for private stormwater facilities, and residential properties must have Environmental Site Design (ESD) to the maximum extent practicable to qualify. The City's Hydrology and Hydraulics staff in Engineering review land development plans against federal, state and local codes.

Outside city limits, Frederick County's Department of Stormwater runs the county's MS4 permit work, which includes restoring 1,027 impervious equivalent acres toward Chesapeake Bay and local TMDL goals. The county's best management practice pages describe porous or permeable pavement as a surface that lets rain and snowmelt seep down to soil and gravel layers below. In both jurisdictions, new projects apply ESD to the maximum extent practicable under the MDE Stormwater Design Manual.

Limestone, sinkholes and cold winters in the Frederick Valley

Frederick sits in a limestone valley between Catoctin Mountain and the Monocacy River, and karst is the first design question. The City's resources for developers point designers to MDE's geotechnical methods for karst feasibility testing and to regional guidance on stormwater design in karst. For permeable pavement that usually means borings or geophysical work before design, then a section that collects water in a lined reservoir and releases it through an underdrain rather than concentrating infiltration in one spot.

Away from the carbonate rock, soils range from silty Piedmont loams to shale-derived clays, and infiltration testing at the footprint still decides whether an underdrain is needed. Winters here are colder and snowier than on the Bay shore, so MDE's maintenance points carry weight: use deicers in moderation, set plow blades about an inch higher than normal, and never pile plowed snow on a permeable surface.

Carroll Creek's flood control channel through downtown is a reminder of how fast the valley's streams rise, so any permeable section needs an overflow route to a stable outfall.

Frederick projects where a lined permeable section can work

Courtyards, alleys and rear patios in the downtown historic district near Carroll Creek, where a natural-stone surface suits the brick streetscape.
New subdivisions around Ballenger Creek, Urbana and Monrovia, where ESD has to be spread across lots and common areas.
Brewery, winery and restaurant patios, where a level, drain-through surface handles foot traffic away from main parking areas.
School walkways and church lots, where impervious area drives the City fee and a credited facility can offset part of it.

Getting a Frederick design reviewed, and Resin Rock's role

Inside the city, plans go to the Engineering Department's Hydrology and Hydraulics staff, and fee credits are requested through the City's stormwater utility fee credit application. In the unincorporated county, development goes through county plan review under the same MDE framework. Expect the reviewer to ask for the karst investigation, liner and underdrain details, and a maintenance plan. MDE's manual names porous asphalt, pervious concrete and permeable interlocking concrete pavers as the basic surface types, so be ready to document how a resin-bound course performs.

Resin Rock is a manufacturer-supplier and does not install. We supply UV-stable binder, natural stone blends, trims and the Rock Crete permeable sub-base, with technical data sheets for the plan set, and we train and approve installers. Through find an installer we usually match Frederick-area projects with an approved installer within 24 hours. Contractors can apply for Maryland installer training.

Before you specify permeable resin-bound in Frederick

Commission a karst feasibility investigation before choosing an infiltrating design.
Plan for an impermeable liner and underdrain where karst features are present.
Confirm whether the property is in the City of Frederick or unincorporated Frederick County.
For a residential credit in the city, document ESD to the maximum extent practicable.
Write a winter plan: light deicer use, raised plow blades and no snow piles on the surface.

Common questions about permeable resin-bound in Frederick

Is permeable pavement safe to use over Frederick's limestone?

It can be, with the right design. Infiltrating concentrated runoff into karst can trigger sinkholes, so engineers here often use a lined reservoir with an underdrain, which still filters and slows runoff without loading water into the rock. The City points developers to MDE's karst feasibility testing methods, and that investigation should come before any design decision.

Can a permeable surface reduce my City of Frederick stormwater fee?

The City offers credits for private stormwater facilities, and residential properties need Environmental Site Design to the maximum extent practicable to qualify. The fee itself is based on impervious area, so ask the City's Hydrology and Hydraulics staff how a permeable resin-bound section would be treated for both the fee calculation and the credit before you build.

Does the City fee apply outside Frederick city limits?

No. The City's stormwater utility fee applies inside city limits. Frederick County's Department of Stormwater runs MS4 permit restoration and watershed programs for the unincorporated county. If your property is outside the city, ask the county directly about current charges and incentives before counting on any credit for a permeable surface.

Official sources for Frederick

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 Frederick, MD