Perc Test
A perc (percolation) test measures how quickly water drains through soil on a parcel — the standard way a county environmental health department determines whether a septic system can legally be installed there.
A licensed engineer or soils specialist digs test holes, fills them with water, and times the drainage rate. Results — pass, fail, or conditional — determine septic system type, size, and placement, or whether the parcel can support a conventional system at all.
Placer, Nevada, El Dorado, and other county environmental health departments require a perc test before permitting any new septic system on land without existing sewer access — a routine step for rural and undeveloped parcels across the Sierra foothills.
A failed or never-performed perc test is one of the biggest reasons buildable-sounding rural land actually isn't, at least not without an expensive engineered system. Many owners of raw or rural land don't know their parcel's perc status, and buyers who evaluate land case-by-case can factor that uncertainty into an offer rather than requiring it resolved upfront.
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