If a leach field floods it becomes anoxic and effective treatment ceases.

Question

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If a leach field floods, the soil pores become filled with water and the oxygen is displaced. This creates anoxic conditions, which are not suitable for the bacteria that are responsible for treating the wastewater. As a result, the treatment process is significantly reduced or may even completely stop until the water drains away and oxygen levels are restored.

If a Leach Field Floods It Becomes Anoxic and Effective