Infiltration Systems

• Primarily a water quality BMP

• Helps meet groundwater recharge

• Moderate to high pollutant removal

  • assumed, but seldom measured
  • not good for soluble pollutants (nitrate & chloride)
  • possible risks of groundwater contamination

• Best used in conjunction with other treatment practices

• Longevity is less than 5 years without multiple pretreatment practices

• Cannot be used if contributing drainage is a hotspot

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Infiltration systems have some of the best pollutant removal capabilities of any stormwater treatment practice; however, soluble pollutants tend to pass through the practice with limited treatment. Caution should be used with these practices in groundwater recharge and karst areas due to the risk of contamination.