IAPMO IGC 199-2004 (R2014)

Drain Rock Replacement Materials Used in Septic Leach Disposal Systems

Drain rock is used in subsoil leach systems that dispose of septic effluent ortreated wastewater effluent in order to provide structural support for the soilsurrounding the leach systems, provide a material that disperses the flow ofeffluent to prevent point loading to the absorptive surface, provide void space forair penetration and for storage capacity in the leach system. Drain rockreplacement materials used to substitute for natural rock. This standard is toinsure that such replacement materials provide equivalent function to drain rockin leach or drainage systems.

International Association of Plumbing and Mechanical Officials [iapmo]

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