What it means
During a percolation test, an inspector soaks and measures water drop in test holes at the proposed field depth. The resulting rate helps determine trench length, system type, and whether an engineered design is needed.
Results vary with season, moisture, and hole preparation. County rules define minimum tests, depths, and who may perform the work.
Why it matters in Santa Cruz County
Santa Cruz County percolation rates differ sharply between sandy beach terraces and tight clay in the mountains, often determining whether a conventional field or mound is feasible on a lot.
Homeowner tip
Schedule soil testing before finalizing building plans, because a failed perc can change where structures and fields may go.
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Also explore the Plumbing Glossary or call 831.225.4344 with questions about your property.