TSBPE-licensed plumbers perform pre-purchase hydrostatic testing for DFW home buyers, agents, and inspectors. Get a neutral report on the under-slab plumbing with upfront pricing.
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When you are days from closing on a home, the plumbing under the slab is a risk you cannot price. Since 1995, Herndon McFarland Plumbing has provided clear, neutral pre-purchase residential hydrostatic testing in the DFW area to help buyers, agents, and inspectors.
Book your pre-purchase test online with Herndon McFarland Plumbing.
A hydrostatic test isolates and pressurizes the drain and sewer lines beneath a home to show whether they hold pressure or leak before a buyer commits. We provide:
Ordered during the option period, this test tells a buyer whether the under-slab sewer lines are sound before the window to negotiate or walk closes. We deliver the result in time to make a difference.
Agents on both sides need a report they can rely on. Herndon McFarland Plumbing acts as the neutral, licensed tester, so the finding stands on its own regardless of who ordered it.
When a test shows the system does not hold, our static isolation testing pinpoints which section of the line is leaking, so the repair scope is known, not guessed.
A pressure test tells you the system leaks; a camera shows where and why. We scope the lines to document the pipe, which strengthens the report a buyer or agent carries into negotiation.
When a test fails, buyers ask what it will take to fix it. We move from test to leak detection and repair, locating the break so both sides can negotiate against a real number.
Under-slab failures are why these tests exist. Our slab leak detection and repair team assesses what a failed test means and what correcting it involves.
What makes a hydrostatic test different from ordinary plumbing work is that it is part of a real estate contract with a deadline. The Texas Real Estate Commission sets the residential contracts DFW deals use, and the option period they define is the buyer’s window to conduct due diligence, including specialty testing, before committing.
TREC describes the option period as the time for a buyer to conduct inspections beyond a walkthrough, and states that a hydrostatic test must be separately authorized in writing by the seller and that only a licensed plumber may perform it. Those two rules shape the whole job: the test has to be arranged, approved, and completed while the clock runs.
This is why turnaround and standing matter in a real estate test. A buyer or agent has limited days to order the test, get the seller’s sign-off, have a licensed plumber run it, and still leave time to act on the result. A slow tester or a report that the other side questions can cost a buyer the leverage the option period was meant to protect.
That is why, at Herndon McFarland Plumbing, we built our testing around the transaction. As the licensed plumber, we schedule within the option period, document the results clearly, and deliver a report that both the buyer and the seller can trust. On a deadline, a neutral test that arrives on time is as valuable as the findings.
Kelli Gorton had a hot water slab leak, the kind of under-slab failure that takes persistence to reach and care to fix without tearing up a home. With the wood floors at stake, what stood out was a crew that protected the house and thoroughly cleaned up once the leak was found.
She wrote:
“I had a hot water slab leak, and they sent out their BEST guys, Daniel, Durance, and Raymond! These guys worked so hard on getting to the leak… It’s hard to find a company that has dedicated guys like them. I would highly recommend this company to anyone. Thank you, guys! I truly appreciate everything you did!”
The determination and care Kelli describes for a slab leak are the same standards we bring to locating under-slab problems during a hydrostatic test. Read Kelli’s full Google review.
Tyrsh Foley has used us several times and keeps coming back, the kind of trust a buyer or agent looks for in a tester. We earned this reputation through consistency across every visit: organized crews, reliable quotes, and direct access to the owner.
She shared:
“I’ve used this company several times now and highly recommend them… The crews are organized, so I know exactly what to expect and when. I appreciate that I can call and talk to the owner/Master Plumber directly with questions. Prices don’t seem inflated or extreme, and quotes have been reliable.”
Reliable quotes and direct access to the Master Plumber are what make a testing report that both sides of a sale can rely on. Read Tyrsh’s full Google review.
Our crews bring more than 100 years of combined experience serving Farmers Branch, Addison, and the surrounding DFW metroplex, backed by TSBPE license #RMP35786. Here is what makes us reliable.
If you are under contract on a DFW home or listing one, a hydrostatic test gives you a clear, neutral answer on the under-slab plumbing. We will schedule within your option period and deliver a report that both sides can trust.
Order it during your option period, the short window after going under contract when you can still negotiate or walk away. A pre-purchase hydrostatic test tells you whether the under-slab sewer lines hold before that window closes, so a hidden problem does not become yours at closing. We schedule to fit that timeline.
We isolate the drain and sewer system at the cleanout, introduce water to bring the under-slab lines to a set level, and watch whether that level holds. If it drops, the system is losing water below the slab. We often follow with a camera to document the line, giving you a clearer picture than a pass-or-fail result alone.
A failed test means the under-slab lines are leaking, which becomes a point of negotiation rather than an automatic dealbreaker. Buyers commonly ask the seller to repair, credit the cost, or adjust the price. Because our report is neutral and licensed, both sides negotiate against the same trusted finding rather than argue over whether a problem exists.
A hydrostatic test tells you whether the whole under-slab system holds. When it does not, static isolation testing narrows the failure to a specific section of the line, so the repair scope is defined rather than guessed. We use it to turn a failed result into an actionable plan.
Yes. Under TREC’s promulgated contracts, a hydrostatic test must be separately authorized in writing by the seller, unlike a standard inspection, and TREC guidance makes clear that only a licensed plumber may perform it. That is why it helps to line up the test early in the option period, so there is time to get a written sign-off, complete the test, and still act on the result. We coordinate to fit that timeline.
You can request a test online anytime, and we will work within your option period. We offer same-day appointments when a closing timeline is tight and deliver the report promptly so buyers, agents, and inspectors can act on it across DFW.
From slab leaks under the foundation to sewer line repipes, every job is diagnosed, documented, and done right. A look at recent work across North Dallas.
Excellent customer service, very friendly staff from the person taking the call to the staff fixing the repairs. Very trustworthy company. Shaun explained the step-by-step process and provided very fair prices.
Their positive, upbeat, anxious-to-please attitude made the whole process the very best it could be! All of the employees were a pleasure to work with. I highly recommend Herndon McFarland.
Trent and Reggie were the most professional associates entering our home. They treated our home with respect as if it were theirs. We will use this company again because of them and our experience.
Mention these offers when you schedule. Cannot be combined; see details on each.
Our thank-you to seniors and active or retired military.
One-time use. Cannot be combined with any other coupon or offer. MENTION AT SCHEDULINGSave on any water slab leak repair or full reroute under your foundation.
Cannot be combined with any other offer or coupon. MENTION AT SCHEDULINGSave on any water heater replacement, tank or tankless.
Cannot be combined with any other offer or coupon. MENTION AT SCHEDULINGSave on any plumbing service call or faucet replacement.
One-time use. Cannot be combined with any other offer or coupon. MENTION AT SCHEDULINGServing Addison and the surrounding metro. Click your city for its service area page.
