Permeable resin-bound surfacing can count as a stormwater practice in Columbia and the rest of Howard County when it is built as permeable pavement over an open-graded stone reservoir and the County accepts it, either in a site development plan or a fee credit application. The Watershed Protection Fee and the CleanScapes program are where that acceptance turns into savings.
A resin-bound topping over an existing driveway, village center walkway or parking lot slab isn't a practice, because the water still leaves on the slab. Howard County's credit rules also depend on when a property was developed, which makes the age of a Columbia neighborhood or commercial site part of the calculation.
How the Watershed Protection Fee and its credits work
Howard County bills a Watershed Protection Fee on the property tax bill each July. Residential owners pay a flat amount by property type: $40 for townhouses, apartments and condominiums, $115 for single-family detached homes on lots of a quarter acre or less, and $225 for larger lots. Commercial and other non-residential owners pay $40 for every 500 square feet of impervious surface.
For non-residential properties, credits equal the share of impervious area treated on site by a stormwater facility, documented with engineer-approved calculations. Sites built under a site development plan dated after January 1, 2003 can earn up to 50% for the practices required when they were built. Sites developed before 2003 can earn up to 100%, but only for impervious area treated to current standards beyond what was originally required, and credits are recertified every three years. The logic is simple: newer sites already had to manage stormwater as a condition of approval.
Homeowners use CleanScapes, which reimburses eligible projects including permeable pavers and pavement removal and can also reduce the fee. Homes must have been built before 2003, projects need approval before installation, and practices required by development regulations aren't eligible.
The program's requirements sheet says permeable paving must comply with MDE's Chapter 5 criteria, cover at least 100 square feet and be installed by a contractor who has attended an ICPI training course on permeable interlocking concrete pavers or has a portfolio of at least five permeable projects with references; its permeable paver checklist asks for an installer with ICPI certification. Ask the program whether a resin-bound surface over a stone reservoir qualifies before you sign a contract.
Rolling Piedmont ground, wells, septic and the Patuxent
Howard County is rolling Piedmont terrain, with silty and clayey soils over weathered crystalline rock and grades that change quickly between Columbia's villages. MDE's ESD criteria for permeable pavement limit the surface slope to 5%, with terracing along contours on steeper ground, and require applications larger than 10,000 square feet to be designed as infiltration practices.
Outside Columbia, much of western Howard County relies on private wells and septic systems. MDE sets permeable pavement back at least 50 feet from confined water supply wells, 100 feet from unconfined wells, 25 feet from septic systems and 10 feet from buildings, which can shrink the usable area on a rural lot quickly. Western streams feed the Patuxent and its drinking water reservoirs, while Columbia drains to the Little Patuxent and Middle Patuxent.
Ellicott City's flash floods are a reminder that steep, built-up valleys move water fast. Overflow from any permeable section needs a safe path to a stable outfall, not toward a neighbor's foundation.
Columbia and county sites that suit permeable resin-bound
- Village center plazas and walkways in Columbia, many built well before 2003, where new treatment beyond what was originally required could earn a larger share of the non-residential credit.
- HOA paths, pool decks and play-area surrounds across Columbia's villages and in Ellicott City and Elkridge subdivisions.
- Townhouse courts and driveways in pre-2003 neighborhoods eligible for CleanScapes.
- Office and flex parks along Route 29 and Route 175, where impervious area drives the per-500-square-foot fee.
- Churches, private schools and nonprofits, which can also look at the County's nonprofit watershed partnership.
County review, credit paperwork and Resin Rock's part
New development and redevelopment go through Howard County's site development plan review, applying ESD to the maximum extent practicable under the MDE manual. For credits, non-residential owners submit engineer-approved calculations of the impervious area treated; homeowners go through CleanScapes, which reviews applications over the winter, schedules site visits and inspects after installation before reimbursing. Raise the resin-bound surface course with reviewers early, since MDE's manual names porous asphalt, pervious concrete and permeable interlocking concrete pavers as the basic types.
Resin Rock manufactures and supplies; it doesn't install. We provide the UV-stable binder, stone blends, trims and Rock Crete permeable sub-base, with technical data sheets for credit calculations and plan sets. We train and approve installers, and find an installer usually produces a Howard County match within 24 hours. Installers wanting approval can see our Maryland training.
Before you specify permeable resin-bound in Howard County
- Confirm the date of the site development plan; it decides which credit rules and ceiling apply.
- For homes, confirm the house was built before 2003 before planning on CleanScapes.
- Get CleanScapes or County approval before installation, not after.
- Map wells, septic fields and buildings and apply MDE setbacks.
- Keep surface slopes at 5% or less, terracing where needed.
- Plan for recertification every three years with maintenance records.
Common questions about permeable resin-bound in Howard County
Can a Columbia homeowner get reimbursed for a permeable driveway?
Possibly, through CleanScapes, which reimburses permeable pavers and other practices for homes built before 2003. Permeable paving must meet MDE's Chapter 5 criteria and be installed by a contractor with ICPI permeable paver training or a portfolio of five permeable projects. Projects must be approved before installation and inspected afterward. Ask the program whether a resin-bound surface over a stone reservoir qualifies before you sign a contract.
How is the commercial Watershed Protection Fee calculated?
Non-residential properties pay $40 for every 500 square feet of impervious surface. Credits reduce the fee by the share of impervious area treated on site. Sites with development plans dated after January 1, 2003 can earn up to 50% for the practices required when built; older sites can earn up to 100% for treatment to current standards beyond what was originally required. Calculations need engineer approval, and credits are recertified every three years.
Is a credit worth it on a flat residential fee?
The residential fee is a flat amount set by property type and lot size, so the dollar savings from a credit are modest. For most homeowners the larger value is CleanScapes reimbursement toward the project and the stormwater benefit itself. Commercial and HOA properties, billed by impervious area, have more to gain.
Official sources for Howard County
- Howard County Watershed Protection Fee
- Non-residential reimbursements and credits
- CleanScapes residential program
- Maryland Stormwater Design Manual (MDE)
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.