Environmental Benefits

Stormwater runoff is a leading source of the pollutants entering our waterways. According to the U.S. Environmental Protection Agency, about 90 percent of surface pollutants are carried by the first 1-1/2 inch of rainfall. Stormwater drains don't typically channel this polluted runoff to treatment facilities, but instead convey it directly into local water bodies. This can increase algae content, harm aquatic life, and require expensive treatments to make the water potable.

According to Youngs, the big three pollutants in urban runoff are sediment (dirt and debris), heavy metals (from the brake linings of cars), and hydrocarbons. One source of hydrocarbons is the oil that drips onto pavements from vehicles. But the primary contributor is asphalt. Studies have shown that 90 to 95 percent of the hydrocarbons in urban runoff is from the binder and sealer used for asphalt pavements, he says.

To address these serious pollution concerns, the EPA and many local municipalities and regional watershed authorities are tightening environmental regulations and requiring more stringent stormwater management practices. Pervious concrete is becoming one of the most viable solutions.


Tree roots need air as well as water. Pervious concrete allows the passage of both.
This pervious parking lot at Miller Park in Fair Oaks, Calif., is helping to preserve
over 23 mature olive trees through natural irrigation. The lush tree canopy
also shades the parking lot to provide natural cooling.

Here are some of the reasons why. A pervious concrete pavement can:

  • Reduce the amount of untreated runoff discharging into storm sewers.
  • Directly recharge groundwater to maintain aquifer levels.
  • Channel more water to tree roots and landscaping, so there is less need for irrigation.
  • Mitigate pollutants that can contaminate watersheds and harm sensitive ecosystems.
  • Eliminate hydrocarbon pollution from asphalt pavements and sealers.

In addition to stormwater control, pervious concrete pavements aid in reducing the urban heat-island effect. Because they are light in color and have an open-cell structure, pervious concrete pavements don't absorb and store heat and then radiate it back into the environment like a typical asphalt surface. The open void structure of the pervious pavement also allows cooler earth temperatures from below to cool the pavement.

The lighter color of concrete is also beneficial from an energy-savings standpoint. Because the concrete is reflective, the need for lighting at night is reduced.

Beyond helping the environment, pervious concrete pavements are also safer for drivers and pedestrians. Because pervious concrete absorbs water rather than allowing it to puddle, it reduces hydroplaning and tire spray. In California, parks are installing pervious concrete pathways to provide disability access for people in wheelchairs.

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