What it means
A mound system pumps effluent to a constructed sand fill above a prepared base. Treatment occurs as effluent moves through sand and native soil before reaching groundwater.
Mounds need pressure dosing, careful shaping, and vegetative cover. They cost more than conventional fields but allow building on sites with limiting conditions.
Why it matters in Santa Cruz County
Santa Cruz County low-lying areas near Watsonville sloughs and coastal terraces with high groundwater often use mounds when standard trenches cannot meet vertical separation.
Homeowner tip
Keep the mound surface grassed and free of erosion so sand media stays evenly covered.
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Also explore the Plumbing Glossary or call 831.225.4344 with questions about your property.