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What are permeable pavers?

Permeable pavers are paving units arranged so rain can pass through their joints into stone layers below. The system stores water temporarily before it soaks into soil or drains away.

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How do permeable pavers work?

Water enters through the joints and reaches a stone reservoir below the pavers. Fairfax County explains that this base both stores water temporarily and supports the surface. “The aggregate base layer provides temporary storage for infiltrated water and structural support for the surface and filters pollutants from runoff.” Source: Fairfax County Public Works and Environmental Services, read 2026-10-31.

What are permeable pavers according to Fairfax County?

Permeable interlocking concrete pavers, abbreviated PICP, form a surface with open joints. Fairfax County explains that the concrete units themselves do not have to absorb the water. “PICP are interlocking pavers with open joints between the pavers.” Source: Fairfax County Public Works and Environmental Services, read 2026-10-31.

What are permeable pavers made of?

The system combines manufactured concrete units with small aggregate in their joints and a stone base below. CMHA distinguishes these stone-filled joints from sand-filled paving systems. “Unlike interlocking concrete pavements, sand jointing or bedding materials to support paving units and dense-graded aggregate bases are not used in PICP.” Source: Concrete Masonry & Hardscapes Association, read 2026-10-31.

What are permeable pavers used for?

Permeable pavers provide a usable surface while managing rainfall. Fairfax County identifies residential and commercial parking areas as suitable examples, while emphasizing light traffic and limited turning. “Examples of suitable locations are residential and commercial parking areas.” Source: Fairfax County Public Works and Environmental Services, read 2026-10-31.

Does permeable paving need drainage?

Drainage depends on the site: water may infiltrate into soil or leave through an underdrain. EPA describes liners and underdrains for PICP where infiltration is unsuitable, including contaminated soils. “Some permeable pavements and PICP installations may include liners and underdrain systems where infiltration is not feasible or desirable due to the presence of underground utilities, contaminated soils that could pollute groundwater if those contaminants mobilize, or surface contaminants (e.g., chlorides) that might negatively affect receiving waters.” Source: U.S. Environmental Protection Agency, read 2026-10-31.

Sources

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