The Texas HO-143TX Foundation Water Endorsement: What It Covers (and Doesn't)

The Texas HO-143TX endorsement is an optional, state-approved add-on that covers foundation damage caused by a plumbing leak — up to $15,000, with the tear-out to reach the pipe included inside that cap. That one-line description carries a one-line catch, and it is the whole point of this page: HO-143TX covers plumbing-leak foundation damage, not the expansive-clay soil shrink-swell that causes most Texas foundation movement. It is genuinely useful protection against the leak scenario, but it is not blanket "foundation insurance." Below is exactly what the endorsement covers, what it does not, why Texas has it at all, how to add it, and how a claim under it gets proved. One caveat runs through all of it: this page is informational only — not legal or insurance advice. Coverage turns on your specific policy and carrier, so confirm the details with your own agent. For the wider question of when any homeowners policy covers foundation repair, start with our foundation insurance pillar.

What the HO-143TX endorsement covers

The endorsement is the Slab or Foundation Coverage endorsement, designated HO-143TX, approved by the Texas Department of Insurance (TDI). Per TDI Commissioner's Order 02-0523, it "provides coverage up to $15,000 for damage to the slab or foundation of the building, if the damage is caused directly by accidental discharge or leakage of water or steam, including constant or repeated seepage over a period of weeks, months, or years," and the order specifies that "the tear out costs are included in the $15,000 limit of liability."

Three features of that language define both the value and the limits of this coverage:

• It covers plumbing-leak foundation damage — slab or foundation harm caused directly by accidental water or steam discharge. The trigger is a leak, not a cause like soil movement.
• It explicitly reaches gradual seepage. A standard homeowners policy draws a hard line between a sudden burst (covered) and a slow leak (excluded). This endorsement crosses that line, covering "constant or repeated seepage over a period of weeks, months, or years" — a meaningful broadening for the slow under-slab leak a base policy would deny.
• Tear-out is inside the cap. Breaking out and replacing the slab to reach the leak is often the most expensive part of the job, and the endorsement covers it — but that cost counts against the same $15,000, so the limit is shared between the foundation damage and the access cost, not stacked on top.

In plain terms: if accidental plumbing-leak water damages your slab, this endorsement can pay to repair the foundation and to tear out and reach the leak, up to a combined $15,000. What it covers is the leak scenario — the kind of under-slab water problem covered in depth on our plumbing leaks and foundation damage page.

What it does NOT cover

Now the limit, stated plainly because it is the most common misunderstanding about this endorsement: HO-143TX does not cover settling or cracking from soil shrink-swell. It is a plumbing-leak coverage, full stop.

If your foundation moved because the expansive clay underneath it swelled in the wet season and shrank in the dry one — the number-one cause of foundation movement in San Antonio and across the Texas clay belt — this endorsement does not pay, exactly as a standard homeowners policy does not. There is no homeowners endorsement that covers expansive-soil shrink-swell, because insurers classify it as maintenance and wear-and-tear rather than a sudden, fortuitous accident. HO-143TX closes the gradual-leak gap; it does not close the soil gap. For the soil science behind the excluded cause — why this ground moves and why moisture management, not insurance, is the lever you actually control — see the expansive-clay-soil deep dive linked from our insurance pillar.

Why Texas has it (the HO-B history)

Texas has a dedicated slab/foundation endorsement for a reason, and the history explains both why it exists and why you now have to add it on purpose.

Historically, the Texas HO-B form was the state's "gold standard" for broad water coverage — a homeowners form that built in relatively generous coverage for water-related damage, including the kind of slab and foundation harm a plumbing leak produces. Then, in the early 2000s, Texas saw a surge in water and mold claims. In response, carriers moved away from the broad HO-B form toward ISO-style HO-3 forms plus endorsements — the same standardized ISO Homeowners 3 Special Form architecture used nationally, which excludes earth movement, settling, and subsurface water by default.

The practical consequence for a Texas homeowner today is straightforward: the broad foundation-water coverage that was once more built-in is now something you generally have to add deliberately. The HO-143TX endorsement (and its dwelling-policy counterpart, DP-143TX) is how that coverage gets bolted back onto a modern ISO-style policy. It is an opt-in, not a default — which is exactly why so many homeowners discover they do not have it only after a leak.

How to add it (and related endorsements)

The cheapest time to add HO-143TX is before anything goes wrong. Once damage has occurred, you are limited to whatever coverage you already had, so this is a renewal-time decision, not a post-loss one. Ask your agent to add the Slab or Foundation Coverage endorsement to your Texas homeowners policy (or DP-143TX to a dwelling policy).

Roughly, a slab/foundation water endorsement runs about $100–$300 per year — but treat that as an illustrative range, not a quote. Pricing and availability vary by carrier, by your underwriting, and by the rest of your policy; your agent can tell you what is actually available on yours and what it costs.

Two related endorsements are worth raising in the same conversation, because they address adjacent water risks the base policy often excludes:

• Water/sewer backup coverage — for backups through drains and sump pumps, a common and messy loss.
• Service-line coverage — for the underground water and sewer lines the homeowner owns, whose failure can feed an under-slab problem in the first place.

None of these — not HO-143TX, not backup, not service-line — covers expansive-soil shrink-swell. They are water-and-leak protections, and that is the gap they fill.

When it pays (and proving it)

HO-143TX pays when the cause is a covered plumbing leak: accidental water or steam discharge — including slow, repeated seepage — that damages the slab or foundation. The classic case is a covered under-slab leak quietly working on the foundation, the kind of loss covered in detail on our slab leaks page. When that happens, the endorsement can pay to repair the foundation and to tear out and reach the leak, up to the shared $15,000 cap.

The hard part is rarely the coverage language — it is proving the cause. Because the endorsement turns on whether a plumbing leak (covered) or soil movement (excluded) caused the damage, a disputed claim usually hinges on establishing which one it was. Water damage is a large share of homeowners claims overall — the Insurance Information Institute (Triple-I) reports that water damage and freezing are among the largest claim categories — yet a foundation that moved on clay can superficially resemble one that moved on a leak. The document that distinguishes them is an independent licensed engineer's cause-of-loss report. That is the evidence a claim turns on, and the timing of it matters: get it on the record before the adjuster forms a position. For how to file and document a foundation water claim step by step, see our claim process guide; for what the report itself contains, the engineer's report page.

FAQ Note

The FAQ below answers what San Antonio homeowners ask most about the HO-143TX endorsement — what it is, how much it covers, whether it touches soil movement, what it costs, whether tear-out is included, how it differs from general "foundation insurance," how to add it, and what DP-143TX is. Every answer carries the same caveat as the page: it is informational, not legal or insurance advice, and your policy, carrier, and exact terms control the actual outcome. For the wider coverage picture, see our foundation insurance pillar and homeowners coverage guide; for the cause the endorsement does cover, plumbing leaks and slab leaks.

Get Matched With a Vetted San Antonio Foundation Specialist

If you are weighing whether an HO-143TX claim applies — or you suspect an under-slab leak and need to know whether it is the covered kind — the decisive next step is establishing the cause, not arguing the endorsement language with an adjuster. We'll match you with a vetted San Antonio specialist and point you to an independent licensed engineer who can produce the cause-of-loss report your claim turns on — the document that distinguishes a covered plumbing leak from excluded soil movement. The match is free, the quote is no-obligation, and we don't take a fee from you. We screen for sealed-engineer diagnosis, a documented plumbing test, and honest sequencing — because whether your loss is covered, and what it takes to repair it, both start with what actually moved your foundation. This service is informational and not legal or insurance advice; confirm coverage specifics with your own agent.