How Much Does a Perc Test Cost in 2026?

Last updated: August 2026 · Reviewed by Nisar Dalvi

What makes one perc test $300 and another $1,900?

Four things, and only one of them is the evaluator's rate. The rest is how much digging your site demands.

• How many holes the county wants. Some require three, others six or more. Evaluators price per hole, so this alone can triple a bill.
• Hand tools or a machine. A hand-dug hole is $150 to $300. Once the soil is too hard or the holes too deep to dig by hand, a backhoe shows up and the floor jumps to about $550.
• Rock and hard ground. Caliche, limestone and dense clay all slow digging down and sometimes need special equipment.
• Access and travel. A remote parcel with no cleared path costs more to reach, and some counties require the evaluator to sit through the entire 24-hour presoak — which you are paying for by the hour.

Sources: Angi and HomeGuide 2026 national figures; Texas Septic Guide, updated 2026, for the Texas cost drivers.

Why is a perc test cheaper in Texas than in Florida?

Because they are not quite the same job. Texas runs a percolation test as part of a site evaluation and typically prices it at $250 to $600. Florida's process leans on a fuller site evaluation with soil profiling and water-table determination, and lands at $750 to $1,900, averaging around $1,300.

Florida has a seasonal high water table to establish, and that measurement drives the entire system design. It is more work, so it costs more. Orlando specifically runs $556 to $1,668, which is a useful sanity check against any quote you get.

What is the test actually measuring?

How fast water disappears into your soil, in minutes per inch — MPI. The evaluator digs a hole, presoaks it until the soil saturates, refills it, and times the drop.

Basis: the EPA puts the workable range for a conventional system at 1 to 60 minutes per inch. Exact thresholds are set by your county, not by the EPA.

The counterintuitive part is that fast soil fails too. Buyers hear "sandy soil drains well" and assume that is good news. Drain too fast and wastewater slips into the groundwater before the soil has treated it, which is exactly what the rules exist to prevent.

Who is legally allowed to run a perc test?

Not you, and not your builder. Both states name who is qualified, and a result from anyone else is worth nothing at the permit counter.

Texas

A preconstruction site evaluation, including soil analysis and percolation testing, must be done by a TCEQ-licensed Site Evaluator or a Texas Professional Engineer. To hold the site evaluator license at all, a person must already carry one of: Installer II, Designated Representative, Texas PE, Texas Professional Sanitarian, Certified Professional Soil Scientist, or a Texas Professional Geoscientist license in soil science — and then pass the soil analysis exam on top.

Florida

Site evaluations must be performed at the owner's expense by an engineer with soils training licensed under Chapter 471 F.S., a master septic tank contractor, a professional soil scientist registered with the Florida Association of Environmental Soil Scientists, a person certified under s. 381.0101 F.S. (a Certified Environmental Health Professional), or department staff.

One detail worth knowing before you hire anyone: registered septic tank contractors may perform site evaluations for repairs only — not for new construction. If you are building on raw land and a septic contractor offers to do your evaluation, that is the wrong person for this job.

How long does a passing result stay valid?

Longer than people fear in Florida, and less certain than people assume in Texas.

Florida writes it down, statewide. Under Chapter 62-6 of the Florida Administrative Code, a site evaluation must be no earlier than 180 days before the department receives the permit application. Once the permit is issued, the evaluation stays valid for the life of that permit — and the construction permit runs 18 months from the date of issue, plus a further 90 days where building construction has already commenced.

Sources: Chapter 62-6 F.A.C.; Santa Rosa County DOH application form; Nassau and Pasco county health department pages. Retrieved August 2026.

Texas is looser. We could not find a statewide expiry in 30 TAC Chapter 285. Plenty of sites quote five years, but that reflects county practice rather than a state rule, so we are not going to publish it as one. Call your county's designated representative and ask before you lean on an old result.

What are your options when the land fails?

This is the section you came for, and almost nobody writes it. A failed test is not automatically the end — it is a ladder, and you should climb it from the bottom.

1. Retest a different part of the lot — $250 to $600

Start here, because it is cheap and it works more often than people expect. One section of a property can fail while another passes comfortably. Before you pay for anything, pull the county health department file: they may already hold a test on that parcel, and it will tell you where the previous evaluator dug.

Practical move — ask the evaluator to assess alternative-system suitability during the same visit. It saves an entire second trip fee.

2. Replace the bad soil — several thousand dollars

Florida writes this into the rule. Under 62-6.008, moderately or severely limited soil can be excavated and replaced with better material, provided the replacement area is at least two feet wider and longer than the drain trench or absorption bed, and the soil is satisfactory to a minimum depth of 54 inches beneath the bottom of the proposed drain field.

It is also what installers actually do. ACE Septic in Tampa excavates unsuitable soil and brings in septic-quality sand as part of installation. Dillon Septic in Texas puts imported sand and specialized topsoil at several thousand dollars added to the job.

3. Aerobic treatment unit — adds $3,000 to $8,000

An ATU treats wastewater before it reaches the soil, so the soil has less work to do. In Texas that lands you at roughly $9,000 to $15,000 all-in. Budget for the strings attached: aerobic units usually need a maintenance contract at $200 to $400 a year and $10 to $20 a month in electricity.

4. Mound or engineered system — adds $4,000 to $10,000

If the soil cannot be worked with, you build above it. A mound system in Texas runs $15,000 to $25,000 total. This is the rung where the project stops being a line item and starts being a decision about whether to buy the land at all.

5. Holding tank — check first, and be skeptical

A holding tank stores waste for pump-out instead of treating it. Most jurisdictions allow them only as a temporary measure, and the pumping bills are relentless. We could not verify Texas and Florida rules on residential holding tanks well enough to publish a cost, so treat any contractor who leads with this option as someone to question closely.

6. The land will not take a septic system

It happens, and it is brutal. A failed perc test can cut a rural parcel's value by 50 percent or more and make it close to unmarketable for residential development. That is the whole reason the next section matters.

Does a failed perc test follow the land forever?

Effectively, yes — and this is the most expensive thing on this page.

The county health department keeps every perc test and site evaluation on file, and those files are public records. The standard advice to check county records before buying rural land exists precisely because the health department may already hold a test for that parcel, including previous failures. The failure attaches to the ground, not to the seller.

Disclosure law is weaker than most buyers assume. Real-estate attorneys generally tell sellers to disclose a failed test and avoid a contract dispute, but statutory disclosure duties for vacant land are patchy — Washington, for one, exempts unimproved land from the seller disclosure statement entirely. We are not going to state Texas or Florida disclosure law without a legal source, so here is the version that is true everywhere:

Never buy land without a perc contingency

A perc contingency makes your obligation to buy conditional on the land passing. If it fails, you walk and your earnest money comes back. This is standard, citable contract language — sample clauses make the buyer's obligations contingent on results showing the property will support a standard septic system and drain field, with the buyer filling the test holes and bearing the cost.

It is not theoretical, and you can price the risk it covers. A rate over about 60 minutes per inch takes a conventional field off the table. What replaces it is a mound or an engineered system, which adds roughly $4,000 to $10,000 over a conventional install — and on a springs-protection or nutrient-reduction site, considerably more. A contingency costs nothing and caps that exposure at the price of the test.

In Texas, the vehicle is the feasibility and termination-option framework in the TREC Unimproved Property Contract. Check the current paragraph numbering against TREC's published form with your agent, because it changes.

Should the buyer or the seller pay?

The buyer, usually, as part of due diligence. The seller cooperates by granting access and having utility lines marked before digging starts. Everything here is negotiable — just get it in writing.

If you are selling rural land, paying for a passing test yourself is often worth it. It removes the single biggest unknown a buyer has, and you can put the result in the listing.

When should you schedule it?

Early — earlier than feels necessary. Two reasons.

First, the result changes what the land is worth to you, so you want it before you are emotionally committed and before your option period runs out. Second, evaluators in busy rural counties book out weeks ahead in spring, and the permit queue behind the test is longer still: two to six weeks in Texas, four to twelve in Florida.

Some counties also require testing during the wet season, when the water table is at its highest, because that is the honest test of the site. If your county does, missing the window can cost you half a year. Ask when you book.

What to ask before you pay

• How many holes does my county require? The answer sets the price.
• Is this hand-dug or machine-dug? The difference is roughly $300 versus $550 to start.
• Does the county require you on site for the full presoak? That is billable time.
• Is the written report and county filing included, or billed separately?
• Can you assess alternative-system suitability on the same visit? Saves a second trip fee if the site is marginal.
• What is your license number? Then look it up. In both states this is a licensed activity.

And the one that matters most: has anyone tested this parcel before? Ask the seller, then ask the county anyway.