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What Is a Perc Test and Why Does Your Property Need One?

Filed in Per Testing 101 — September 3, 2025

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When you’re planning to build a home or install a septic system, one of the first steps you’ll hear about is a perc test. But what exactly is it, and why is it so important?

What Is a Perc Test?

A percolation test (often shortened to “perc test”) measures how quickly water drains through your soil. This determines whether your property is suitable for a septic system and, if so, what type of system you’ll need.

Why Is It Required?

Each county has specific regulations for septic system approval, and a perc test is part of that process. Without a passing test, you may not be able to move forward with your build. Filing fees vary by county—some counties don’t charge, while others have fees of $35–$50 or more.

What to Expect During Testing

Our team at JT Soil Services will:

  • Dig test holes in the proposed septic area.
  • Fill them with water to measure absorption rates.
  • Record data required for county approval.

Why It Matters for You

A perc test isn’t just about following rules—it’s about protecting your investment. A properly sized and placed septic system keeps your home running smoothly, prevents groundwater contamination, and saves you costly repairs down the road.

Tip: At JT Soil Services, we always ask if you already have an installer. If not, we’d be happy to provide a bid. In most cases, clients choose us for the full system after testing, which keeps the process seamless.

Ready to schedule your perc test? Contact JT Soil Services today to get started.

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This free guide answers your biggest questions. From understanding perc tests and permit requirements to avoiding costly mistakes. Whether you're building new or replacing an old system, this checklist gives you clarity, confidence, and a smoother process from day one.

5 Things You Must Know Before Installing or Replacing a Septic System in Wisconsin.

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