Short answer
A percolation (perc) test measures how fast water drains through your soil. It's the single biggest factor in sizing your drainfield and choosing your system type — no septic system can be designed or permitted without it.
What it measures
The test gauges your soil's texture, class, and how quickly it absorbs water across the proposed drainfield area — the soil's loading rate.
Why it sets your system
Better-draining soil needs a smaller drainfield and may allow a conventional system; tighter, clay-heavy soil needs a larger field or an aerobic system. The result drives the whole design and cost.
What to expect
We perform the test, document the results, and design a permitted system around your actual site conditions — so it passes county inspection and performs for decades.
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