Can A Failed Perc Test Be Overcome With Design Changes?

Reassessing Soil Conditions and System Sizing

A failed perc test indicates that the soil cannot accept the proposed wastewater flow. In such cases, reassessing soil conditions and system sizing is essential. For example, if the perc test failed due to high water tables, a design change could involve installing a drip irrigation system to distribute wastewater further into the soil, reducing the pressure on the drainfield. Alternatively, reducing the system capacity by downsizing the septic tank or reducing water usage can also help.

Alternative Drainfield Designs

When a conventional drainfield is not feasible due to a failed perc test, alternative designs can be explored. A mound drainfield, for instance, involves creating a raised mound of soil over the drainfield to allow for better soil percolation. Another option is a chamber drainfield, which uses perforated plastic chambers to distribute wastewater into the soil. These designs can be more expensive than conventional systems but offer a viable solution in challenging soil conditions.

Maintenance and Monitoring

Regardless of the design changes made, regular maintenance and monitoring are crucial to ensure the system’s performance and longevity. This includes inspecting the drainfield for signs of failure, such as odors, surface water, or vegetation growth, and addressing any issues promptly. Regular pumping of the septic tank and proper water treatment can also help prevent system failure and maintain a healthy drainfield.