North Carolina Septic Inspector Exam 2 Practice Test

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A soil horizon with limited permeability typically requires what change to drainfield design?

There is no need to alter the drainfield design.

A smaller drainfield area is required.

A larger drainfield area may be required.

When soil has limited permeability, its ability to accept and treat effluent is reduced. To keep the hydraulic loading within what the soil can handle, the drainfield must cover a larger area so the wastewater is spread out over more infiltrative surface. This helps ensure adequate infiltration and treatment and reduces the risk of saturation or failure. The other options don’t fit because changing nothing ignores the soil constraint, a smaller area would overload the soil, and replacing the system isn’t the default response unless a feasible design isn’t possible.

The system should be replaced.