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# Hydrostatic Plumbing Test: What a Texas Seller Signs, Pays and Risks
- URL: https://fast-house-buying.ghost.io/hydrostatic-plumbing-test/
- Published: 2026-11-02T20:19:06.000Z
- Updated: 2026-11-02T20:19:06.000Z
- Description: A buyer wants a hydrostatic plumbing test on your Texas house. Here is what you must sign first, who pays for the test and any damage, and what to do with the results.
- Author: Fast House Buying Team
- Tags: Repairs and Condition

A few days after you sign a contract, the buyer's agent sends a short note: the buyer would like a hydrostatic plumbing test. It is a reasonable request on a house with drain lines under a concrete slab, but it is also a test that can cause damage, and the contract treats it differently from an ordinary inspection. This guide covers what the test is, what you have to sign before it happens, who pays for it and for any damage, and what to do with the results.

## What is a hydrostatic plumbing test?

The Texas Real Estate Commission describes a hydrostatic test as a way to test pipelines, plumbing, boilers and tanks [for strength and leaks](https://www.trec.texas.gov/q-what-hydrostatic-test), and notes that the testing pressure is always higher than the system's normal operating pressure. That higher pressure is the reason the seller gets a say.

Three facts from TREC set the ground rules:

- **It is optional.** TREC says a hydrostatic test is [not a mandatory part](https://www.trec.texas.gov/q-hydrostatic-testing-mandatory-part-inspection-resale-real-property) of the inspection of a property.
- **A home inspector cannot run it.** TREC says [only a licensed plumber](https://www.trec.texas.gov/q-can-licensed-inspector-perform-hydrostatic-test) may perform a hydrostatic test on a system within a home.
- **It needs its own signature.** More on that in the next section.

![Hand saw, dusty work gloves, a yellow tape measure and a claw hammer laid out on a light wood surface](https://storage.ghost.io/c/28/2c/282c05bc-4417-4544-9579-a61f1ab303f1/content/images/2026/11/c5484718.jpg)

## Does a seller have to allow a hydrostatic test?

No, not automatically. TREC calls its [One to Four Family Residential Contract (Resale)](https://www.trec.texas.gov/forms/one-four-family-residential-contract-resale), now form 20-19, its most frequently used contract form. In paragraph 7A of [that contract](https://www.trec.texas.gov/sites/default/files/pdf-forms/20-19.pdf) the seller agrees to give the buyer access at reasonable times and lets the buyer hire inspectors, and then adds one sentence: "Any hydrostatic testing must be separately authorized by Seller in writing."

TREC's answer to this exact question says there must be [a separately signed document](https://www.trec.texas.gov/q-if-buyer-wishes-have-hydrostatic-test-performed-home-what-required-seller-consent-such-test) of authorization by the seller. It also says authorization language typed into the special provisions of the contract is not separate consent. So agreeing to inspections in general does not mean agreeing to this test, and nobody should pressurize your pipes until you have signed something specific to it.

Saying no is allowed. It may also lead a buyer who still has an option period to walk away, so treat the request as a negotiation rather than a formality.

## Who pays for the test, and who pays for damage?

TREC publishes a one-page [Addendum for Authorizing Hydrostatic Testing](https://www.trec.texas.gov/forms/addendum-authorizing-hydrostatic-testing-0), form 48-1, effective March 1, 2020\. TREC describes it as covering who pays for, and who is responsible for damages from, the test. At the top of [the form](https://www.trec.texas.gov/sites/default/files/pdf-forms/48-1.pdf) is a warning to consult a licensed plumber about the scope of the test and its risks before signing.

Paragraph A is the authorization itself: the seller authorizes the buyer, at the buyer's expense, to hire a licensed plumber to perform a hydrostatic plumbing test on the property. So the cost of the test sits with the buyer on this form.

Paragraph B allocates the risk of damage, and the parties pick one of three boxes:

1. The seller is liable for damages caused by the test.
2. The buyer is liable for damages caused by the test.
3. The buyer is liable for damages caused by the test up to a dollar amount the parties fill in.

This box is the real decision. If you check the first one, any damage the test causes is yours. If the buyer resists the second, the third lets you agree on a cap. Ask the plumber who will run the test what could go wrong on your house before you choose.

## What if the test finds a leak?

Then you know something you may not have known before, and that matters for disclosure. Section 5.008 of the [Texas Property Code](https://statutes.capitol.texas.gov/Docs/PR/htm/PR.5.htm) sets out the Seller's Disclosure Notice. Its third question asks whether the seller is aware of any known defects or malfunctions in a list of items that includes "Plumbing/Sewers/Septics" and "Foundation/Slab(s)". Talk to your agent or a real estate attorney about whether a test result means your notice needs to be updated, especially if this buyer leaves and you sell to someone else.

With this buyer, the usual contract paths apply:

- **The buyer can still leave during the option period.** Paragraph 7D of form 20-19 says even a buyer who accepted the house "As Is" keeps the right to inspect, to negotiate repairs in a later amendment, and to terminate during the option period.
- **Any repair deal has to be in writing.** Paragraph 22 says the contract cannot be changed except by the parties' written agreement.
- **Agreed repairs follow paragraph 7F.** Unless you agree otherwise in writing, you finish them before the closing date, get any required permits, use people licensed for that work, give the buyer the scope of work and proof of payment, and transfer any transferable warranties.
- **Lender required repairs are separate.** Under paragraph 7E, neither side must pay for them unless agreed in writing, and if their cost exceeds 5% of the sales price the buyer may terminate.

## A seller's checklist when the request arrives

1. **Ask for it in writing**, with the name and license number of the plumber the buyer plans to use.
2. **Read form 48-1 before you sign it.** Make sure the property address is filled in and that paragraph A says the test is at the buyer's expense and done by a licensed plumber.
3. **Call your own plumber if you are unsure.** The form itself tells you to ask a licensed plumber about scope and risk first.
4. **Choose the risk box on purpose.** Box 2 puts damage on the buyer. Box 3 sets a cap. Box 1 puts it on you.
5. **Schedule it inside the option period.** A test after the window closes gives the buyer less room to act on it.
6. **Get a copy of the results.** Whatever the plumber finds becomes part of what you know about the house.
7. **Decide in writing.** Repair, credit, price change or no change: put the answer in a signed amendment.

## Should you test before you list?

You can order your own test before listing so there are no surprises in the middle of a contract. Two things follow from that choice. You pick the plumber and control the timing. And whatever the test shows is something you know when you fill out the disclosure notice. Neither is a reason to avoid testing, but decide with both in view, and ask a licensed plumber what the test involves on your specific house first.

## Will a cash buyer ask for one?

Any buyer under the standard resale contract can ask. The hydrostatic testing sentence is in that contract regardless of how the buyer pays, and any buyer can ask you to sign form 48-1\. What changes with no lender is that paragraph 7E has nothing to act on. If you would rather skip a testing and repair round and [sell your house fast in Spring TX](https://www.fasthousebuying.com/cities/spring) or anywhere else, ask every buyer before you sign whether they plan to request a hydrostatic test, and how they want to split the risk if they do.

Written by the Fast House Buying team. We buy houses for cash in Texas, so we have a commercial interest in this topic. This is general information, not legal or tax advice.