Abstract
Continued investigations of the drain field environment in the Spokane Valley of eastern Washington strengthen earlier conclusions. Very high prevalent moisture tensions, at depth, are related to a lack of deep fluid percolation and lateral movement of waste waters is assumed. Downward movement of chemical pollutants cannot be demonstrated but may occur during early stages of drain field operation. Migration of bacteria is restricted to a relatively few feet from the leach bed. Routine monitoring of groundwater quality did not at any time produce positive results for coliform bacteria. Neither could the chemical quality of the groundwater be related to drain field operation. Local areas where problems have been associated with the use of septic tanks and drain fields appear to be restricted to marginal valley settings where geologic conditions are vastly different.
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