Apparently not. According to the site below, permeable asphalt actually improves local water quality: surface contaminants from pavements tend to wash into groundwater, but with permeable asphalt they enter the stone bed and from there into deep soil, where they’re supposedly cleansed by “bacteria and other natural processes”. It looks like there hasn’t been much extensive testing done, but oils, grease, solids, and metals may have a high level of isolation in porous asphalt.
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